ORCID Profile
0000-0002-6437-6176
Current Organisations
International Centre for Radio Astronomy Research
,
Curtin University Curtin Institute of Radio Astronomy
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Astronomical and Space Sciences | High Energy Astrophysics; Cosmic Rays | Particle Physics | Cosmology and Extragalactic Astronomy | Astronomical and Space Instrumentation |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Computer Hardware and Electronic Equipment not elsewhere classified | Network Infrastructure Equipment | Command, Control and Communications
Related Links
Publications
KM3NeT front-end and readout electronics system: hardware, firmware, and software
Publisher: SPIE-Intl Soc Optical Eng
Date: 23-12-2019
An assessment of the association between a fast radio burst and binary neutron star merger
Publisher: Springer Science and Business Media LLC
Date: 27-03-2023
Characterisation of the Hamamatsu photomultipliers for the KM3NeT Neutrino Telescope
Publisher: IOP Publishing
Date: 31-05-2018
FRATs: a search for Fast Radio Transients with LOFAR
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3615150
An air shower array for LOFAR: LORA
Publisher: Copernicus GmbH
Date: 09-06-2011
LUNASKA neutrino search with the Parkes and ATCA telescopes
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4807514
A lunar radio experiment with the Parkes radio telescope for the LUNASKA project
Publisher: Elsevier BV
Date: 05-2015
The most probable host of CHIME FRB 190425A, associated with binary neutron star merger GW190425, and a late-time transient search
Publisher: Oxford University Press (OUP)
Date: 09-12-2022
Abstract: The identification and localization of fast radio bursts (FRBs) to their host galaxies have revealed important details about the progenitors of these mysterious, millisecond-long bursts of coherent radio emission. In this work, we study the most probable host galaxy of the apparently non-repeating CHIME/FRB event FRB 20190425A – a particularly high-luminosity, low-dispersion measure event that was demonstrated in a recent paper to be temporally and spatially coincident with the LIGO-Virgo-KAGRA binary neutron star merger GW190425, suggesting an astrophysical association (p-value 0.0052). In this paper, we remain agnostic to this result, and we confirm UGC10667 as the most probable host galaxy of FRB 20190425A, demonstrating that the host galaxies of low-dispersion measure, one-off CHIME FRBs can be plausibly identified. We then perform multiwavelength observations to characterize the galaxy and search for any afterglow emission associated with the FRB and its putative GW counterpart. We find no radio or optical transient emission in our observations $2.5\\, \\mathrm{yr}$ post-burst. UGC10667 is a spiral galaxy at z ∼ 0.03, dominated by an old stellar population. We find no evidence of a large population of young stars, with nebular emission dominated by star formation at a rate of $1\\!-\\!2\\, ~\\mathrm{M_\\odot \\, yr^{-1}}$. While we cannot rule out a young magnetar as the origin of FRB 20190425A, our observations are consistent with an origin in a long delay-time neutron star binary merger.
Limit on ultrahigh energy neutrino flux from the Parkes Lunar Radio Cherenkov experiment
Publisher: Oxford University Press (OUP)
Date: 11-08-2007
Searches for clustering in the time integrated skymap of the ANTARES neutrino telescope
Publisher: IOP Publishing
Date: 06-05-2014
The prototype detection unit of the KM3NeT detector
Publisher: Springer Science and Business Media LLC
Date: 29-01-2016
Letter of intent for KM3NeT 2.0
Publisher: IOP Publishing
Date: 23-06-2016
A luminous fast radio burst that probes the Universe at redshift 1
Publisher: American Association for the Advancement of Science (AAAS)
Date: 20-10-2023
ANTARES Neutrino Search for Time and Space Correlations with IceCube High-energy Neutrino Events
Publisher: American Astronomical Society
Date: 12-07-2019
Intrinsic limits on resolutions in muon- and electron-neutrino charged-current events in the KM3NeT/ORCA detector
Publisher: Springer Science and Business Media LLC
Date: 05-2017
Comparison of the Parkes and FAST FRB DM distribution
Publisher: Oxford University Press (OUP)
Date: 11-03-2022
Abstract: We model the fast radio burst (FRB) dispersion measure (DM) distribution for the Five-hundred-meter Aperture Spherical Telescope (FAST) and compare this with the four FRBs published in the literature to date. We compare the DM distribution of Parkes and FAST, taking advantage of the similarity between their multibeam receivers. Notwithstanding the limited s le size, we observe a paucity of events at low DM for all evolutionary models considered, resulting in a sharp rise in the observed cumulative distribution function in the region of 1000 pc cm−3 ≲ DM ≲ 2000 pc cm−3. These traits could be due to statistical fluctuations (0.12 ≤ p ≤ 0.22), a complicated energy distribution or break in an energy distribution power law, spatial clustering, observational bias, or outliers in the s le (e.g. an excessive DMHost as recently found for FRB 20190520B). The energy distribution in this regime is unlikely to be adequately constrained until further events are detected. Modelling suggests that FAST may be well placed to discriminate between redshift evolutionary models and to probe the helium ionization signal of the intergalactic medium.
An Ultra-High Time Resolution Cosmic-Ray Detection Mode for the Murchison Widefield Array
Publisher: World Scientific Pub Co Pte Ltd
Date: 24-02-2021
DOI: 10.1142/S2251171721500033
Abstract: The radio-wavelength detection of extensive air showers (EASs) initiated by cosmic-ray interactions in the Earth’s atmosphere is a promising technique for investigating the origin of these particles and the physics of their interactions. The Low-frequency Array (LOFAR) and the Owens Valley Long Wavelength Array (OVRO-LWA) have both demonstrated that the dense cores of low-frequency radio telescope arrays yield detailed information on the radiation ground pattern, which can be used to reconstruct key EAS properties and infer the primary cosmic-ray composition. Here, we demonstrate a new observation mode of the Murchison Widefield Array (MWA), tailored to the observation of the sub-microsecond coherent bursts of radiation produced by EAS. We first show how an aggregate 30.72[Formula: see text]MHz bandwidth ([Formula: see text][Formula: see text]kHz frequency channels) recorded at 0.1[Formula: see text]ms resolution with the MWA’s voltage capture system (VCS) can be synthesized back to the full bandwidth Nyquist resolution of 16.3[Formula: see text]ns. This process, which involves “inverting” two sets of polyphase filterbanks, retains 90.5% of the signal-to-noise of a cosmic-ray signal. We then demonstrate the timing and positional accuracy of this mode by resolving the location of a calibrator pulse to within 5[Formula: see text]m. Finally, preliminary observations show that the rate of nanosecond radio-frequency interference (RFI) events is 0.1[Formula: see text]Hz, much lower than that found at the sites of other radio telescopes that study cosmic rays. We conclude that the identification of cosmic rays at the MWA, and hence with the low-frequency component of the Square Kilometre Array, is feasible with minimal loss of efficiency due to RFI.
Stacked search for time shifted high energy neutrinos from gamma ray bursts with the Antares neutrino telescope
Publisher: Springer Science and Business Media LLC
Date: 2017
ANTARES upper limits on the multi-TeV neutrino emission from the GRBs detected by IACTs
Publisher: IOP Publishing
Date: 03-2021
DOI: 10.1088/1475-7516/2021/03/092
Abstract: The first gamma-ray burst detections by Imaging Atmospheric Cherenkov Telescopes have been recently announced: GRB 190114C, detected by MAGIC, GRB 180720B and GRB 190829A, observed by H.E.S.S. A dedicated search for neutrinos in space and time coincidence with the gamma-ray emission observed by IACTs has been performed using ANTARES data. The search covers both the prompt and afterglow phases, yielding no neutrinos in coincidence with the three GRBs studied. Upper limits on the energetics of the neutrino emission are inferred. The resulting upper limits are several orders of magnitude above the observed gamma-ray emission, and they do not allow to constrain the available models.
The sensitivity of the next generation of lunar Cherenkov observations to UHE neutrinos and cosmic rays
Publisher: Elsevier BV
Date: 2009
Model-independent search for neutrino sources with the ANTARES neutrino telescope
Publisher: Elsevier BV
Date: 2020
Commensal discovery of four fast radio bursts during Parkes Pulsar Timing Array observations
Publisher: Oxford University Press (OUP)
Date: 28-06-2019
Abstract: The Parkes Pulsar Timing Array (PPTA) project monitors two dozen millisecond pulsars (MSPs) in order to undertake a variety of fundamental physics experiments using the Parkes 64-m radio telescope. Since 2017 June, we have been undertaking commensal searches for fast radio bursts (FRBs) during the MSP observations. Here, we report the discovery of four FRBs (171209, 180309, 180311, and 180714). The detected events include an FRB with the highest signal-to-noise ratio ever detected at the Parkes Observatory, which exhibits unusual spectral properties. All four FRBs are highly polarized. We discuss the future of commensal searches for FRBs at Parkes.
Nature of radio-wave radiation from particle cascades
Publisher: American Physical Society (APS)
Date: 13-01-2022
LUNASKA experiments using the Australia Telescope Compact Array to search for ultrahigh energy neutrinos and develop technology for the lunar Cherenkov technique
Publisher: American Physical Society (APS)
Date: 26-02-2010
Limit on the ultrahigh-energy neutrino flux from lunar observations with the Parkes radio telescope
Publisher: American Physical Society (APS)
Date: 09-03-2015
LUNASKA experiment observational limits on UHE neutrinos from Centaurus A and the Galactic Centre
Publisher: Oxford University Press (OUP)
Date: 24-09-2010
A single fast radio burst localized to a massive galaxy at cosmological distance.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-08-2019
Abstract: Fast radio bursts (FRBs) are brief radio emissions from distant astronomical sources. Some are known to repeat, but most are single bursts. Nonrepeating FRB observations have had insufficient positional accuracy to localize them to an in idual host galaxy. We report the interferometric localization of the single-pulse FRB 180924 to a position 4 kiloparsecs from the center of a luminous galaxy at redshift 0.3214. The burst has not been observed to repeat. The properties of the burst and its host are markedly different from those of the only other accurately localized FRB source. The integrated electron column density along the line of sight closely matches models of the intergalactic medium, indicating that some FRBs are clean probes of the baryonic component of the cosmic web.
The Lunar Cherenkov technique—Answering the unanswered questions
Publisher: Elsevier BV
Date: 2012
The host galaxy of FRB 20171020A revisited
Publisher: Cambridge University Press (CUP)
Date: 2023
DOI: 10.1017/PASA.2023.27
Abstract: The putative host galaxy of FRB 20171020A was first identified as ESO 601-G036 in 2018, but as no repeat bursts have been detected, direct confirmation of the host remains elusive. In light of recent developments in the field, we re-examine this host and determine a new association confidence level of 98%. At 37 Mpc, this makes ESO 601-G036 the third closest FRB host galaxy to be identified to date and the closest to host an apparently non-repeating FRB (with an estimated repetition rate limit of $ $ $0.011$ bursts per day above $10^{39}$ erg). Due to its close distance, we are able to perform detailed multi-wavelength analysis on the ESO 601-G036 system. Follow-up observations confirm ESO 601-G036 to be a typical star-forming galaxy with H i and stellar masses of $\\log_{10}\\!(M_{\\rm{H\\,{\\small I}}} / M_\\odot) \\sim 9.2$ and $\\log_{10}\\!(M_\\star / M_\\odot) = 8.64^{+0.03}_{-0.15}$ , and a star formation rate of $\\text{SFR} = 0.09 \\pm 0.01\\,{\\rm M}_\\odot\\,\\text{yr}^{-1}$ . We detect, for the first time, a diffuse gaseous tail ( $\\log_{10}\\!(M_{\\rm{H\\,{\\small I}}} / M_\\odot) \\sim 8.3$ ) extending to the south-west that suggests recent interactions, likely with the confirmed nearby companion ESO 601-G037. ESO 601-G037 is a stellar shred located to the south of ESO 601-G036 that has an arc-like morphology, is about an order of magnitude less massive, and has a lower gas metallicity that is indicative of a younger stellar population. The properties of the ESO 601-G036 system indicate an ongoing minor merger event, which is affecting the overall gaseous component of the system and the stars within ESO 601-G037. Such activity is consistent with current FRB progenitor models involving magnetars and the signs of recent interactions in other nearby FRB host galaxies.
Search for neutrino counterparts of gravitational-wave events detected by LIGO and Virgo during run O2 with the ANTARES telescope
Publisher: Springer Science and Business Media LLC
Date: 05-2020
DOI: 10.1140/EPJC/S10052-020-8015-6
Abstract: An offline search for a neutrino counterpart to gravitational-wave (GW) events detected during the second observation run (O2) of Advanced-LIGO and Advanced-Virgo performed with ANTARES data is presented. In addition to the search for long tracks induced by $$\\nu _\\mu $$ ν μ ( $${\\overline{\\nu }}_{\\mu }$$ ν ¯ μ ) charged current interactions, a search for showering events induced by interactions of neutrinos of any flavour is conducted. The severe spatial and time coincidence provided by the gravitational-wave alert allows regions above the detector horizon to be probed, extending the ANTARES sensitivity over the entire sky. The results of this all-neutrino-flavour and all-sky time dependent analysis are presented. The search for prompt neutrino emission within ±500 s around the time of six GW events yields no neutrino counterparts. Upper limits on the neutrino spectral fluence and constraints on the isotropic energy radiated via high-energy neutrinos (from a few TeV to a few tens of PeV) are set for each GW event analysed.
Lunar radio Cherenkov observations of UHE neutrinos
Publisher: Elsevier BV
Date: 06-2009
Science with the Murchison Widefield Array: Phase I results and Phase II opportunities
Publisher: Cambridge University Press (CUP)
Date: 2019
DOI: 10.1017/PASA.2019.41
Abstract: The Murchison Widefield Array (MWA) is an open access telescope dedicated to studying the low-frequency (80–300 MHz) southern sky. Since beginning operations in mid-2013, the MWA has opened a new observational window in the southern hemisphere enabling many science areas. The driving science objectives of the original design were to observe 21 cm radiation from the Epoch of Reionisation (EoR), explore the radio time domain, perform Galactic and extragalactic surveys, and monitor solar, heliospheric, and ionospheric phenomena. All together $60+$ programs recorded 20 000 h producing 146 papers to date. In 2016, the telescope underwent a major upgrade resulting in alternating compact and extended configurations. Other upgrades, including digital back-ends and a rapid-response triggering system, have been developed since the original array was commissioned. In this paper, we review the major results from the prior operation of the MWA and then discuss the new science paths enabled by the improved capabilities. We group these science opportunities by the four original science themes but also include ideas for directions outside these categories.
Search of dark matter annihilation in the galactic centre using the ANTARES neutrino telescope
Publisher: IOP Publishing
Date: 30-10-2015
Parkes observations for project P852 semester 2013OCTS
Publisher: No publisher found
Date: 2014
The Spectral Properties of the Bright Fast Radio Burst Population
Publisher: American Astronomical Society
Date: 14-02-2019
The SKA particle array prototype: The first particle detector at the Murchison Radio-astronomy Observatory
Publisher: Elsevier BV
Date: 09-2020
ANTARES constrains a blazar origin of two IceCube PeV neutrino events
Publisher: EDP Sciences
Date: 30-03-2015
Erratum: Science with the murchison widefield array: Phase I results and phase II opportunities (Publications of the Astronomical Society of Australia (2019) 36 (1-30) DOI: 10.1017/pasa.2019.41)
Publisher: Cambridge University Press (CUP)
Date: 2020
DOI: 10.1017/PASA.2020.4
A Nonrepeating Fast Radio Burst in a Dwarf Host Galaxy
Publisher: American Astronomical Society
Date: 05-2023
Abstract: We present the discovery of an as yet nonrepeating fast radio burst (FRB), FRB 20210117A, with the Australian Square Kilometre Array Pathfinder (ASKAP), as a part of the Commensal Real-time ASKAP Fast Transients Survey. The subarcsecond localization of the burst led to the identification of its host galaxy at z = 0.214(1). This redshift is much lower than what would be expected for a source dispersion measure (DM) of 729 pc cm −3 , given typical contributions from the intergalactic medium and the host galaxy. Optical observations reveal the host to be a dwarf galaxy with little ongoing star formation—very different to the dwarf host galaxies of the known repeating FRBs 20121102A and 20190520B. We find an excess DM contribution from the host and attribute it to the FRB’s local environment. We do not find any radio emission from the FRB site or host galaxy. The low magnetized environment and the lack of a persistent radio source indicate that the FRB source is older than those found in other dwarf host galaxies, establishing the ersity of FRB sources in dwarf galaxy environments. We find our observations to be fully consistent with the “hypernebula” model, where the FRB is powered by an accretion jet from a hyperaccreting black hole. Finally, our high time resolution analysis reveals burst characteristics similar to those seen in repeating FRBs. We encourage follow-up observations of FRB 20210117A to establish any repeating nature.
Spectropolarimetric Analysis of FRB 181112 at Microsecond Resolution: Implications for Fast Radio Burst Emission Mechanism
Publisher: American Astronomical Society
Date: 12-03-2020
Status and strategies of current LUNASKA lunar Cherenkov observations with the Parkes radio telescope
Publisher: Elsevier BV
Date: 2012
ANTARES Search for Point Sources of Neutrinos Using Astrophysical Catalogs: A Likelihood Analysis
Publisher: American Astronomical Society
Date: 04-2021
Abstract: A search for astrophysical pointlike neutrino sources using the data collected by the ANTARES detector between 2007 January 29 and 2017 December 31 is presented. A likelihood method is used to assess the significance of an excess of muon neutrinos inducing track-like events in correlation with the location of a list of possible sources. Different sets of objects are tested in the analysis: (a) a subs le of the Fermi 3LAC catalog of blazars, (b) a jet-obscured population of active galactic nuclei, (c) a s le of hard X-ray selected radio galaxies, (d) a star-forming galaxy catalog, and (e) a public s le of 56 very-high-energy track events from the IceCube experiment. None of the tested sources shows a significant association with the s le of neutrinos detected by ANTARES. The smallest p -value is obtained for the catalog of radio galaxies with an equal-weights hypothesis, with a pre-trial p -value equivalent to a 2.8 σ excess, which is equivalent to 1.6 σ post-trial. In addition, the results of a dedicated analysis for the blazar MG3 J225517+2409 are also reported: this source is found to be the most significant within the Fermi 3LAC s le, with five ANTARES events located less than one degree from the source. This blazar showed evidence of flaring activity in Fermi data, in spacetime coincidence with a high-energy track detected by IceCube. An a posteriori significance of 2.6 σ for the combination of ANTARES and IceCube data is reported.
Limits on the population of repeating fast radio bursts from the ASKAP/CRAFT lat50 survey
Publisher: Oxford University Press (OUP)
Date: 04-05-2019
The effect of gravitational lensing on fast transient event rates
Publisher: Oxford University Press (OUP)
Date: 22-10-2022
Abstract: Fast cosmological transients such as fast radio bursts (FRBs) and gamma-ray bursts (GRBs) represent a class of sources more compact than any other cosmological object. As such, they are sensitive to significant magnification via gravitational lensing from a class of lenses which are not well constrained by observations today. Low-mass primordial black holes are one such candidate which may constitute a significant fraction of the Universe’s dark matter. Current observations only constrain their density in the nearby Universe, giving fast transients from cosmological distances the potential to form complementary constraints. Motivated by this, we calculate the effect that gravitational lensing from a cosmological distribution of compact objects would have on the observed rates of FRBs and GRBs. For static lensing geometries, we rule out the prospect that all FRBs are gravitationally lensed for a range of lens masses and show that lens masses greater than 10−5M⊙ can be constrained with 8000 unlocalized high-fluence FRBs at 1.4GHz, as might be detected by the next generation of FRB-finding telescopes.
The fast radio burst dispersion measure distribution
Publisher: Oxford University Press (OUP)
Date: 30-12-2020
Abstract: We compare the dispersion measure (DM) statistics of FRBs detected by the ASKAP and Parkes radio telescopes. We jointly model their DM distributions, exploiting the fact that the telescopes have different survey fluence limits but likely s le the same underlying population. After accounting for the effects of instrumental temporal and spectral resolution of each s le, we find that a fit between the modelled and observed DM distribution, using identical population parameters, provides a good fit to both distributions. Assuming a one-to-one mapping between DM and redshift for an homogeneous intergalactic medium (IGM), we determine the best-fitting parameters of the population spectral index, $\\hat{\\alpha }$, and the power-law index of the burst energy distribution, $\\hat{\\gamma }$, for different redshift evolutionary models. Whilst the overall best-fitting model yields $\\hat{\\alpha }=2.2_{-1.0}^{+0.7}$ and $\\hat{\\gamma }=2.0_{-0.1}^{+0.3}$, for a strong redshift evolutionary model, when we admit the further constraint of α = 1.5 we favour the best fit $\\hat{\\gamma }=1.5 \\pm 0.2$ and the case of no redshift evolution. Moreover, we find no evidence that the FRB population evolves faster than linearly with respect to the star formation rate over the DM (redshift) range for the s led population.
The z–DM distribution of fast radio bursts
Publisher: Oxford University Press (OUP)
Date: 27-10-2021
Abstract: We develop a sophisticated model of fast radio burst (FRB) observations, accounting for the intrinsic cosmological gas distribution and host galaxy contributions, and give the most detailed account yet of observational biases due to burst width, dispersion measure, and the exact telescope beamshape. Our results offer a significant increase in both accuracy and precision beyond those previously obtained. Using results from ASKAP and Parkes, we present our best-fitting FRB population parameters in a companion paper. Here, we consider in detail the expected and fitted distributions in redshift, dispersion measure, and signal to noise. We estimate that the unlocalized ASKAP FRBs arise from z & 0.5, with between a third and a half within z & 0.1. Our predicted source-counts (‘logN–logS’) distribution confirms previous indications of a steepening index near the Parkes detection threshold of 1 Jy ms. We find no evidence for a minimum FRB energy, and rule out Emin & 1039.0 erg at 90 per cent C.L. Importantly, we find that above a certain DM, observational biases cause the Macquart (DM–z) relation to become inverted, implying that the highest-DM events detected in the unlocalized Parkes and ASKAP s les are unlikely to be the most distant. More localized FRBs will be required to quantitatively estimate this effect, though its cause is a well-understood observational bias. Works assuming a 1–1 DM–z relation may therefore derive erroneous results. Our analysis of errors suggests that limiting factors in our analysis are understanding of FRB spectral behaviour, sensitivity response of search experiments, and the treatment of the repeating population and luminosity function.
Measurement of the Rate Distribution of the Population of Repeating Fast Radio Bursts: Implications for Progenitor Models
Publisher: American Astronomical Society
Date: 22-05-2020
Which bright fast radio bursts repeat?
Publisher: Oxford University Press (OUP)
Date: 16-05-2020
Abstract: A handful of fast radio bursts (FRBs) are now known to repeat. However, the question remains – do they all? We report on an extensive observational c aign with the Australian Square Kilometre Array Pathfinder (ASKAP), Parkes, and Robert C. Byrd Green Bank Telescope, searching for repeat bursts from FRBs detected by the Commensal Real-time ASKAP Fast Transients survey. In 383.2 h of follow-up observations covering 27 FRBs initially detected as single bursts, only two repeat bursts from a single FRB, FRB 171019, were detected, which have been previously reported by Kumar et al. We use simulations of repeating FRBs that allow for clustering in burst arrival times to calculate new estimates for the repetition rate of FRB 171019, finding only slight evidence for incompatibility with the properties of FRB 121102. Our lack of repeat bursts from the remaining FRBs set limits on the model of all bursts being attributable to repeating FRBs. Assuming a reasonable range of repetition behaviour, at most 60 per cent (90 per cent confidence limit) of these FRBs have an intrinsic burst distribution similar to FRB 121102. This result is shown to be robust against different assumptions on the nature of repeating FRB behaviour, and indicates that if indeed all FRBs repeat, the majority must do so very rarely.
Search for dark matter towards the Galactic Centre with 11 years of ANTARES data
Publisher: Elsevier BV
Date: 06-2020
Ultra-high-energy cosmic ray and neutrino detection using the Moon
Publisher: Elsevier BV
Date: 03-2011
Status report and future prospects on LUNASKA lunar observations with ATCA
Publisher: Elsevier BV
Date: 06-2009
The unseen host galaxy and high dispersion measure of a precisely localized fast radio burst suggests a high-redshift origin
Publisher: Oxford University Press (OUP)
Date: 04-08-2023
Abstract: FRB 20210912A is a fast radio burst (FRB), detected and localized to subarcsecond precision by the Australian Square Kilometre Array Pathfinder. No host galaxy has been identified for this burst despite the high precision of its localization and deep optical and infrared follow-up, to 5σ limits of R = 26.7 mag and Ks = 24.9 mag with the Very Large Telescope. The combination of precise radio localization and deep optical imaging has almost always resulted in the secure identification of a host galaxy, and this is the first case in which the line of sight is not obscured by the Galactic disc. The dispersion measure of this burst, DMFRB = 1233.696 ± 0.006 pc cm−3, allows for a large source redshift of z & 1 according to the Macquart relation. It could thus be that the host galaxy is consistent with the known population of FRB hosts, but is too distant to detect in our observations (z & 0.7 for a host like that of the first repeating FRB source, FRB 20121102A) that it is more nearby with a significant excess in DMhost, and thus dimmer than any known FRB host or, least likely, that the FRB is truly hostless. We consider each possibility, making use of the population of known FRB hosts to frame each scenario. The fact of the missing host has ramifications for the FRB field: even with high-precision localization and deep follow-up, some FRB hosts may be difficult to detect, with more distant hosts being the less likely to be found. This has implications for FRB cosmology, in which high-redshift detections are valuable.
A method to stabilise the performance of negatively fed KM3NeT photomultipliers
Publisher: IOP Publishing
Date: 19-12-2016
ANTARES and IceCube Combined Search for Neutrino Point-like and Extended Sources in the Southern Sky
Publisher: American Astronomical Society
Date: 04-2020
A Search for Cosmic Neutrino and Gamma-Ray Emitting Transients in 7.3 yr of ANTARES and Fermi LAT Data
Publisher: American Astronomical Society
Date: 25-11-2019
A population analysis of pulse broadening in ASKAP fast radio bursts
Publisher: Oxford University Press (OUP)
Date: 06-07-2020
Abstract: The pulse morphology of fast radio bursts (FRBs) provides key information in both understanding progenitor physics and the plasma medium through which the burst propagates. We present a study of the profiles of 33 bright FRBs detected by the Australian Square Kilometre Array Pathfinder. We identify seven FRBs with measureable intrinsic pulse widths, including two FRBs that have been seen to repeat. In our modest s le, we see no evidence for bimodality in the pulse width distribution. We also identify five FRBs with evidence of millisecond time-scale pulse broadening caused by scattering in inhomogeneous plasma. We find no evidence for a relationship between pulse broadening and extragalactic dispersion measure. The scattering could be either caused by extreme turbulence in the host galaxy or chance propagation through foreground galaxies. With future high time resolution observations and detailed study of host galaxy properties, we may be able to probe line-of-sight turbulence on gigaparsec scales.
Constraining the neutrino emission of gravitationally lensed Flat-Spectrum Radio Quasars with ANTARES data
Publisher: IOP Publishing
Date: 11-11-2014
gSeaGen: The KM3NeT GENIE-based code for neutrino telescopes
Publisher: Elsevier BV
Date: 11-2020
A [2]Rotaxane-Based Circularly Polarized Luminescence Switch
Publisher: American Chemical Society (ACS)
Date: 22-10-2019
DOI: 10.1021/JACS.9B07143
Two-screen scattering in CRAFT FRBs
Publisher: Oxford University Press (OUP)
Date: 09-2023
Chronicling the Host Galaxy Properties of the Remarkable Repeating FRB 20201124A
Publisher: American Astronomical Society
Date: 30-09-2021
KM3NeT/ARCA expectations in view of a novel multimessenger study of starburst galaxies
Publisher: IOP Publishing
Date: 12-2021
DOI: 10.1088/1748-0221/16/12/C12016
Abstract: Starburst galaxies (SBGs) and more in general star-forming galaxies represent a class of galaxies with a high star formation rate (up to 100 M ⊙ /year). Despite their low luminosity, they can be considered as guaranteed “factories” of high energy neutrinos, being “reservoirs” of accelerated cosmic rays and hosting a high density target gas in the central region. In this contribution we present a novel multimessenger study of these sources and the possibility of observing their neutrino signals with the KM3NeT/ARCA telescope. The differential sensitivity for different SBG scenarios is reported considering track-like neutrino events in the 100 GeV–100 PeV energy range.
Calculation and Uncertainty of Fast Radio Burst Structure Based on Smoothed Data
Publisher: American Astronomical Society
Date: 31-08-2023
Abstract: Studies of the time-domain structure of fast radio bursts (FRBs) require an accurate estimate of the FRB dispersion measure in order to recover the intrinsic burst shape. Furthermore, the exact dispersion measure is itself of interest when studying the time evolution of the medium through which multiple bursts from repeating FRBs propagate. A commonly used approach to obtain the dispersion measure is to take the value that maximizes the FRB structure in the time domain. However, various authors use differing methods to obtain this structure parameter and do not document the smoothing method used. Furthermore, there are no quantitative estimates of the error in this procedure in the FRB literature. In this article, we present a smoothing filter based on the discrete cosine transform, and show that computing the structure parameter by summing the squares of the derivatives and taking the square root (that is, the 2-norm, Σ ( d / dt ) 2 ) immediately lends itself to the calculation of the uncertainty of the structure parameter. We illustrate this with FRB 20181112A and FRB 20210117A data, which were detected by the Australian Square Kilometre Array Pathfinder, and for which high-time-resolution data are available.
MWA rapid follow-up of gravitational wave transients: Prospects for detecting prompt radio counterparts
Publisher: Cambridge University Press (CUP)
Date: 2023
DOI: 10.1017/PASA.2023.49
Measuring the atmospheric neutrino oscillation parameters and constraining the 3+1 neutrino model with ten years of ANTARES data
Publisher: Springer Science and Business Media LLC
Date: 06-2019
Abstract: The ANTARES neutrino telescope has an energy threshold of a few tens of GeV. This allows to study the phenomenon of atmospheric muon neutrino disappearance due to neutrino oscillations. In a similar way, constraints on the 3+1 neutrino model, which foresees the existence of one sterile neutrino, can be inferred. Using data collected by the ANTARES neutrino telescope from 2007 to 2016, a new measurement of Δ m 32 2 and θ 23 has been performed — which is consistent with world best-fit values — and constraints on the 3+1 neutrino model have been derived.
All-flavor Search for a Diffuse Flux of Cosmic Neutrinos with Nine Years of ANTARES Data
Publisher: American Astronomical Society
Date: 18-01-2018
Thinned simulations of extremely energetic showers in dense media for radio applications
Publisher: Elsevier BV
Date: 09-2009
General description of electromagnetic radiation processes based on instantaneous charge acceleration in “endpoints”
Publisher: American Physical Society (APS)
Date: 04-11-2011
Modelling repetition in zDM: A single population of repeating fast radio bursts can explain CHIME data
Publisher: Cambridge University Press (CUP)
Date: 26-10-2023
DOI: 10.1017/PASA.2023.51
Coherent Cherenkov radio emission from EeV showers in dense media through thinned simulations
Publisher: Elsevier BV
Date: 06-2009
Letter of interest for a neutrino beam from Protvino to KM3NeT/ORCA
Publisher: Springer Science and Business Media LLC
Date: 09-2019
DOI: 10.1140/EPJC/S10052-019-7259-5
Abstract: The Protvino accelerator facility located in the Moscow region, Russia, is in a good position to offer a rich experimental research program in the field of neutrino physics. Of particular interest is the possibility to direct a neutrino beam from Protvino towards the KM3NeT/ORCA detector, which is currently under construction in the Mediterranean Sea 40 km offshore Toulon, France. This proposal is known as P2O. Thanks to its baseline of 2595 km, this experiment would yield an unparalleled sensitivity to matter effects in the Earth, allowing for the determination of the neutrino mass ordering with a high level of certainty after only a few years of running at a modest beam intensity of $$\\approx ~90~\\hbox {kW}$$ ≈ 90 kW . With a prolonged exposure ( $$\\approx 1500\\hbox { kW}\\,\\,\\hbox {year}$$ ≈ 1500 kW year ), a $$2\\sigma $$ 2 σ sensitivity to the leptonic CP-violating Dirac phase can be achieved. A second stage of the experiment, comprising a further intensity upgrade of the accelerator complex and a densified version of the ORCA detector (Super-ORCA), would allow for up to a $$6\\sigma $$ 6 σ sensitivity to CP violation and a $$10^\\circ {-}17^\\circ $$ 10 ∘ - 17 ∘ resolution on the CP phase after 10 years of running with a 450 kW beam, competitive with other planned experiments. The initial composition and energy spectrum of the neutrino beam would need to be monitored by a near detector, to be constructed several hundred meters downstream from the proton beam target. The same neutrino beam and near detector set-up would also allow for neutrino-nucleus cross section measurements to be performed. A short-baseline sterile neutrino search experiment would also be possible.
Ultimate precision in cosmic-ray radio detection — the SKA
Publisher: EDP Sciences
Date: 2017
Probabilistic Association of Transients to their Hosts (PATH)
Publisher: American Astronomical Society
Date: 04-2021
Abstract: We introduce a new method to estimate the probability that an extragalactic transient source is associated with a candidate host galaxy. This approach relies solely on simple observables: sky coordinates and their uncertainties, galaxy fluxes, and angular sizes. The formalism invokes Bayes’ rule to calculate the posterior probability from the galaxy prior P ( O ), observables x , and an assumed model for the true distribution of transients in/around their host galaxies. Using simulated transients placed in the well-studied Cosmic Evolution Survey field, we consider several agnostic and physically motivated priors and offset distributions to explore the method sensitivity. We then apply the methodology to the set of 13 fast radio bursts (FRBs) localized with an uncertainty of several arcseconds. Our methodology finds nine of these are securely associated to a single host galaxy, . We examine the observed and intrinsic properties of these secure FRB hosts, recovering distributions similar to those found in previous works. Furthermore, we find a strong correlation between the apparent magnitude of the securely identified host galaxies and the estimated cosmic dispersion measures of the corresponding FRBs, which results from the Macquart relation. Future work with FRBs will leverage this relation and other measures from the secure hosts as priors for future associations. The methodology is generic to transient type, localization error, and image quality. We encourage its application to other transients where host galaxy associations are critical to the science, e.g., gravitational wave events, gamma-ray bursts, and supernovae. We have encoded the technique in Python on GitHub: github.com/FRBs/astropath .
Monte Carlo simulations for the ANTARES underwater neutrino telescope
Publisher: IOP Publishing
Date: 29-01-2021
Sensitivity of the KM3NeT/ARCA neutrino telescope to point-like neutrino sources
Publisher: Elsevier BV
Date: 09-2019
The dispersion–brightness relation for fast radio bursts from a wide-field survey
Publisher: Springer Science and Business Media LLC
Date: 10-2018
DOI: 10.1038/S41586-018-0588-Y
Abstract: Despite considerable efforts over the past decade, only 34 fast radio bursts-intense bursts of radio emission from beyond our Galaxy-have been reported
Constraints on ultra-high-energy neutrino flux from radio observations of the Moon
Publisher: Copernicus GmbH
Date: 22-08-2012
Limits on Precursor and Afterglow Radio Emission from a Fast Radio Burst in a Star-forming Galaxy
Publisher: American Astronomical Society
Date: 24-09-2020
Search for muon-neutrino emission from GeV and TeV gamma-ray flaring blazars using five years of data of the ANTARES telescope
Publisher: IOP Publishing
Date: 04-12-2015
TANAMI blazars in the IceCube PeV-neutrino fields
Publisher: EDP Sciences
Date: 06-2014
Architecture and performance of the KM3NeT front-end firmware
Publisher: SPIE-Intl Soc Optical Eng
Date: 07-01-2021
A global perspective on the trophic geography of sharks
Publisher: Springer Science and Business Media LLC
Date: 18-01-2018
DOI: 10.1038/S41559-017-0432-Z
Abstract: Sharks are a erse group of mobile predators that forage across varied spatial scales and have the potential to influence food web dynamics. The ecological consequences of recent declines in shark biomass may extend across broader geographic ranges if shark taxa display common behavioural traits. By tracking the original site of photosynthetic fixation of carbon atoms that were ultimately assimilated into muscle tissues of 5,394 sharks from 114 species, we identify globally consistent biogeographic traits in trophic interactions between sharks found in different habitats. We show that populations of shelf-dwelling sharks derive a substantial proportion of their carbon from regional pelagic sources, but contain in iduals that forage within additional isotopically erse local food webs, such as those supported by terrestrial plant sources, benthic production and macrophytes. In contrast, oceanic sharks seem to use carbon derived from between 30° and 50° of latitude. Global-scale compilations of stable isotope data combined with biogeochemical modelling generate hypotheses regarding animal behaviours that can be tested with other methodological approaches.
A targeted search for repeating fast radio bursts with the MWA
Publisher: Oxford University Press (OUP)
Date: 22-11-2022
Abstract: We present a targeted search for low-frequency (144–215 MHz) fast radio burst (FRB) emission from five repeating FRBs using 23.3 h of archival data taken with the Murchison Widefield Array (MWA) voltage capture system (VCS) between 2014 September and 2020 May. This is the first time that the MWA VCS has been used to search for FRB signals from known repeaters, which enables much more sensitive FRB searches than previously performed with the standard MWA correlator mode. We performed a standard single-pulse search with a temporal and spectral resolution of $400\\, \\mu$s and 10 kHz, respectively, over a $100\\, \\text{pc}\\, \\text{cm}^{-3}$ dispersion measure (DM) range centred at the known DM of each studied repeating FRB. No FRBs exceeding a 6σ threshold were detected. The fluence upper limits in the range of 32–1175 and 36–488 Jy ms derived from 10 observations of FRB 20190711A and four observations of FRB 20201124A, respectively, allow us to constrain the spectral indices of their bursts to ≳−1 if these two repeaters were active during the MWA observations. If free–free absorption is responsible for our non-detection, we can constrain the size of the absorbing medium in terms of the electron temperature T to ${\\lt} 1.00\\times (T/10^4\\,\\text{K})^{-1.35}\\, \\text{pc}$, ${\\lt} 0.92\\times (T/10^4\\,\\text{K})^{-1.35}\\, \\text{pc}$, and ${\\lt} [0.22\\!-\\!2.50]\\times (T/10^4\\,\\text{K})^{-1.35}\\, \\text{pc}$ for FRB 20190117A, FRB 20190711A, and FRB 20201124A, respectively. However, given that the activities of these repeaters are not well characterized, our non-detections could also suggest they were inactive during the MWA observations.
Coincidence of a high-fluence blazar outburst with a PeV-energy neutrino event
Publisher: Springer Science and Business Media LLC
Date: 18-04-2016
DOI: 10.1038/NPHYS3715
The slope of the source-count distribution for fast radio bursts
Publisher: Oxford University Press (OUP)
Date: 10-11-2018
Event reconstruction for KM3NeT/ORCA using convolutional neural networks
Publisher: IOP Publishing
Date: 08-10-2020
Optical and X-ray early follow-up of ANTARES neutrino alerts
Publisher: IOP Publishing
Date: 24-02-2016
Search for magnetic monopoles with ten years of the ANTARES neutrino telescope
Publisher: Elsevier BV
Date: 06-2022
Overview of lunar detection of ultra-high energy particles and new plans for the SKA
Publisher: EDP Sciences
Date: 2017
The directional dependence of the lunar Cherenkov technique for UHE neutrino detection
Publisher: Elsevier BV
Date: 06-2009
Prospects for detecting ultra-high-energy particles with FAST
Publisher: IOP Publishing
Date: 02-2019
Detecting ultra high energy neutrinos with LOFAR
Publisher: Elsevier BV
Date: 2012
Characterizing the Fast Radio Burst Host Galaxy Population and its Connection to Transients in the Local and Extragalactic Universe
Publisher: American Astronomical Society
Date: 17-01-2022
Abstract: We present the localization and host galaxies of one repeating and two apparently nonrepeating fast radio bursts (FRBs). FRB 20180301A was detected and localized with the Karl G. Jansky Very Large Array to a star-forming galaxy at z = 0.3304. FRB20191228A and FRB20200906A were detected and localized by the Australian Square Kilometre Array Pathfinder to host galaxies at z = 0.2430 and z = 0.3688, respectively. We combine these with 13 other well-localized FRBs in the literature, and analyze the host galaxy properties. We find no significant differences in the host properties of repeating and apparently nonrepeating FRBs. FRB hosts are moderately star forming, with masses slightly offset from the star-forming main sequence. Star formation and low-ionization nuclear emission-line region emission are major sources of ionization in FRB host galaxies, with the former dominant in repeating FRB hosts. FRB hosts do not track stellar mass and star formation as seen in field galaxies (more than 95% confidence). FRBs are rare in massive red galaxies, suggesting that progenitor formation channels are not solely dominated by delayed channels which lag star formation by gigayears. The global properties of FRB hosts are indistinguishable from core-collapse supernovae and short gamma-ray bursts hosts, and the spatial offset (from galaxy centers) of FRBs is mostly inconsistent with that of the Galactic neutron star population (95% confidence). The spatial offsets of FRBs (normalized to the galaxy effective radius) also differ from those of globular clusters in late- and early-type galaxies with 95% confidence.
Erratum to “Results from the search for dark matter in the Milky Way with 9 years of data of the ANTARES neutrino telescope” [Phys. Lett. B 769 (2017) 249–254]
Publisher: Elsevier BV
Date: 09-2019
Using negative-latency gravitational wave alerts to detect prompt radio bursts from binary neutron star mergers with the Murchison Widefield Array
Publisher: Oxford University Press (OUP)
Date: 21-08-2019
Abstract: We examine how fast radio burst (FRB)-like signals predicted to be generated during the merger of a binary neutron star (BNS) may be detected in low-frequency radio observations triggered by the aLIGO/Virgo gravitational-wave detectors. The rapidity, directional accuracy, and sensitivity of follow-up observations with the Murchison Widefield Array (MWA) are considered. We show that with current methodology, the rapidity criterion fails for triggered MWA observations above 136 MHz for BNS mergers within the aLIGO/Virgo horizon, for which little dispersive delay is expected. A calculation of the expected reduction in response time by triggering on ‘negative latency’ alerts from aLIGO/Virgo observations of gravitational waves generated by the BNS inspiral is presented. This allows for observations up to 300 MHz where the radio signal is expected to be stronger. To compensate for the poor positional accuracy expected from these alerts, we propose a new MWA observational mode that is capable of viewing one-quarter of the sky. We show the sensitivity of this mode is sufficient to detect an FRB-like burst from an event similar to GW 170817 if it occurred during the ongoing aLIGO/Virgo third science run (O3).
Detecting radio emission from air showers with LOFAR
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4807530
A southern sky search for repeating fast radio bursts using the Australian SKA Pathfinder
Publisher: Oxford University Press (OUP)
Date: 19-03-2019
DOI: 10.1093/MNRAS/STZ804
Electromagnetic radiation in the Tamm problem
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4807539
A search for time dependent neutrino emission from microquasars with the ANTARES telescope
Publisher: Elsevier BV
Date: 09-2014
Deep-sea deployment of the KM3NeT neutrino telescope detection units by self-unrolling
Publisher: IOP Publishing
Date: 19-11-2020
Simulating radio emission from air showers with CoREAS
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4807534
A search for neutrino emission from the Fermi bubbles with the ANTARES telescope
Publisher: Springer Science and Business Media LLC
Date: 02-2014
High time resolution and polarization properties of ASKAP-localized fast radio bursts
Publisher: Oxford University Press (OUP)
Date: 24-07-2020
Abstract: Combining high time and frequency resolution full-polarization spectra of fast radio bursts (FRBs) with knowledge of their host galaxy properties provides an opportunity to study both the emission mechanism generating them and the impact of their propagation through their local environment, host galaxy, and the intergalactic medium. The Australian Square Kilometre Array Pathfinder (ASKAP) telescope has provided the first ensemble of bursts with this information. In this paper, we present the high time and spectral resolution, full polarization observations of five localized FRBs to complement the results published for the previously studied ASKAP FRB 181112. We find that every FRB is highly polarized, with polarization fractions ranging from 80 to 100 per cent, and that they are generally dominated by linear polarization. While some FRBs in our s le exhibit properties associated with an emerging archetype (i.e. repeating or apparently non-repeating), others exhibit characteristic features of both, implying the existence of a continuum of FRB properties. When examined at high time resolution, we find that all FRBs in our s le have evidence for multiple subcomponents and for scattering at a level greater than expected from the Milky Way. We find no correlation between the erse range of FRB properties (e.g. scattering time, intrinsic width, and rotation measure) and any global property of their host galaxy. The most heavily scattered bursts reside in the outskirts of their host galaxies, suggesting that the source-local environment rather than the host interstellar medium is likely the dominant origin of the scattering in our s le.
First results on dark matter annihilation in the Sun using the ANTARES neutrino telescope
Publisher: IOP Publishing
Date: 13-11-2013
Constraining the contribution of Gamma-Ray Bursts to the high-energy diffuse neutrino flux with 10 yr of ANTARES data
Publisher: Oxford University Press (OUP)
Date: 25-11-2020
Abstract: Addressing the origin of the astrophysical neutrino flux observed by IceCube is of paramount importance. Gamma-Ray Bursts (GRBs) are among the few astrophysical sources capable of achieving the required energy to contribute to such neutrino flux through pγ interactions. In this work, ANTARES data have been used to search for upward going muon neutrinos in spatial and temporal coincidence with 784 GRBs occurred from 2007 to 2017. For each GRB, the expected neutrino flux has been calculated in the framework of the internal shock model and the impact of the lack of knowledge on the majority of source redshifts and on other intrinsic parameters of the emission mechanism has been quantified. It is found that the model parameters that set the radial distance where shock collisions occur have the largest impact on neutrino flux expectations. In particular, the bulk Lorentz factor of the source ejecta and the minimum variability time-scale are found to contribute significantly to the GRB-neutrino flux uncertainty. For the selected sources, ANTARES data have been analysed by maximizing the discovery probability of the stacking s le through an extended maximum-likelihood strategy. Since no neutrino event passed the quality cuts set by the optimization procedure, 90 per cent confidence level upper limits (with their uncertainty) on the total expected diffuse neutrino flux have been derived, according to the model. The GRB contribution to the observed diffuse astrophysical neutrino flux around 100 TeV is constrained to be less than 10 per cent.
Limit on the ultrahigh-energy cosmic-ray flux with the Westerbork synthesis radio telescope
Publisher: American Physical Society (APS)
Date: 23-11-2010
The fast radio burst population evolves, consistent with the star formation rate
Publisher: Oxford University Press (OUP)
Date: 27-10-2021
Abstract: Fast radio bursts (FRBs) are extremely powerful sources of radio waves observed at cosmological distances. We use a sophisticated model of FRB observations – presented in detail in a companion paper – to fit FRB population parameters using large s les of FRBs detected by ASKAP and Parkes, including seven sources with confirmed host galaxies. Our fitted parameters demonstrate that the FRB population evolves with redshift in a manner consistent with, or faster than, the star formation rate (SFR), ruling out a non-evolving population at better than 98 per cent CL (depending on modelling uncertainties). Our estimated maximum FRB energy is $\\log _{10} E_{\\rm max} [{\\rm erg}] = 41.70_{-0.06}^{+0.53}$ (68 per cent CL) assuming a 1 GHz emission bandwidth, with slope of the cumulative luminosity distribution $\\gamma =-1.09_{-0.10}^{+0.14}$. We find a log-mean host DM contribution of $129_{-48}^{+66}$ pc cm−3 on top of a typical local (interstellar medium and halo) contribution of ∼80 pc cm−3, which is higher than most literature values. These results are insensitive to assumptions of the FRB spectral index, and are consistent with the model of FRBs arising as the high-energy limit of magnetar bursts, but allow for FRB progenitors that evolve faster than the SFR.
Measurement of the atmospheric ν μ energy spectrum from 100 GeV to 200 TeV with the ANTARES telescope
Publisher: Springer Science and Business Media LLC
Date: 10-2013
Measurement of the atmospheric ν and ν energy spectra with the ANTARES neutrino telescope
Publisher: Elsevier BV
Date: 05-2021
SEARCHES FOR POINT-LIKE AND EXTENDED NEUTRINO SOURCES CLOSE TO THE GALACTIC CENTER USING THE ANTARES NEUTRINO TELESCOPE
Publisher: American Astronomical Society
Date: 11-04-2014
A measurement of Hubble’s Constant using Fast Radio Bursts
Publisher: Oxford University Press (OUP)
Date: 08-09-2022
Abstract: We constrain the Hubble constant H0 using Fast Radio Burst (FRB) observations from the Australian Square Kilometre Array Pathfinder (ASKAP) and Murriyang (Parkes) radio telescopes. We use the redshift-dispersion measure (‘Macquart’) relationship, accounting for the intrinsic luminosity function, cosmological gas distribution, population evolution, host galaxy contributions to the dispersion measure (DMhost), and observational biases due to burst duration and telescope beamshape. Using an updated s le of 16 ASKAP FRBs detected by the Commensal Real-time ASKAP Fast Transients (CRAFT) Survey and localized to their host galaxies, and 60 unlocalized FRBs from Parkes and ASKAP, our best-fitting value of H0 is calculated to be $73_{-8}^{+12}$ km s−1 Mpc−1. Uncertainties in FRB energetics and DMhost produce larger uncertainties in the inferred value of H0 compared to previous FRB-based estimates. Using a prior on H0 covering the 67–74 km s−1 Mpc−1 range, we estimate a median ${\\rm DM}_{\\rm host}= 186_{-48}^{+59}\\,{\\rm pc \\, cm^{-3}}$, exceeding previous estimates. We confirm that the FRB population evolves with redshift similarly to the star-formation rate. We use a Schechter luminosity function to constrain the maximum FRB energy to be log10Emax$=41.26_{-0.22}^{+0.27}$ erg assuming a characteristic FRB emission bandwidth of 1 GHz at 1.3 GHz, and the cumulative luminosity index to be $\\gamma =-0.95_{-0.15}^{+0.18}$. We demonstrate with a s le of 100 mock FRBs that H0 can be measured with an uncertainty of ±2.5 km s−1 Mpc−1, demonstrating the potential for clarifying the Hubble tension with an upgraded ASKAP FRB search system. Last, we explore a range of s le and selection biases that affect FRB analyses.
The directional dependence of apertures, limits and sensitivity of the lunar Cherenkov technique to a UHE neutrino flux
Publisher: Elsevier BV
Date: 06-2009
Sensitivity to light sterile neutrino mixing parameters with KM3NeT/ORCA
Publisher: Springer Science and Business Media LLC
Date: 10-2021
Abstract: KM3NeT/ORCA is a next-generation neutrino telescope optimised for atmospheric neutrino oscillations studies. In this paper, the sensitivity of ORCA to the presence of a light sterile neutrino in a 3+1 model is presented. After three years of data taking, ORCA will be able to probe the active-sterile mixing angles θ 14 , θ 24 , θ 34 and the effective angle θ μe , over a broad range of mass squared difference $$ \\Delta {m}_{41}^2 $$ ∆ m 41 2 ∼ [10 − 5 , 10] eV 2 , allowing to test the eV-mass sterile neutrino hypothesis as the origin of short baseline anomalies, as well as probing the hypothesis of a very light sterile neutrino, not yet constrained by cosmology. ORCA will be able to explore a relevant fraction of the parameter space not yet reached by present measurements.
Observation of the cosmic ray shadow of the Sun with the ANTARES neutrino telescope
Publisher: American Physical Society (APS)
Date: 28-12-2020
Search for muon neutrinos from gamma-ray bursts with the ANTARES neutrino telescope using 2008 to 2011 data
Publisher: EDP Sciences
Date: 29-10-2013
Recent Results from the ANTARES Neutrino Telescope
Publisher: WORLD SCIENTIFIC
Date: 15-03-2017
A census of baryons in the Universe from localized fast radio bursts
Publisher: Springer Science and Business Media LLC
Date: 27-05-2020
The performance and calibration of the CRAFT fly’s eye fast radio burst survey
Publisher: Cambridge University Press (CUP)
Date: 2019
DOI: 10.1017/PASA.2019.1
Abstract: The Commensal Real-time Australian Square Kilometre Array Pathfinder Fast Transients survey is the first extensive astronomical survey using phased array feeds. Since January 2017, it has been searching for fast radio bursts in fly’s eye mode. Here, we present a calculation of the sensitivity and total exposure of the survey that detected the first 20 of these bursts, using the pulsars B1641-45 and B0833-45 as calibrators. The beamshape, antenna-dependent system noise, and the effects of radio-frequency interference and fluctuations during commissioning are quantified. Effective survey exposures and sensitivities are calculated as a function of the source counts distribution. Statistical ‘stat’ and systematics ‘sys’ effects are treated separately. The implied fast radio burst rate is significantly lower than the 37 sky −1 day −1 calculated using nominal exposures and sensitivities for this same s le by Shannon et al. (2018). At the Euclidean (best-fit) power-law index of −1.5 (−2.2), the rate is $12.7_{-2.2}^{+3.3}$ (sys) ± 3.6 (stat) sky −1 day −1 ( $20.7_{-1.7}^{+2.1}$ (sys) ± 2.8 (stat) sky −1 day −1 ) above a threshold of 56.6 ± 6.6(sys) Jy ms (40.4 ± 1.2(sys) Jy ms). This strongly suggests that these calculations be performed for other FRB-hunting experiments, allowing meaningful comparisons to be made between them.
The Control Unit of the KM3NeT Data Acquisition System
Publisher: Elsevier BV
Date: 11-2020
Systematic performance of the ASKAP fast radio burst search algorithm
Publisher: Oxford University Press (OUP)
Date: 15-06-2023
Abstract: Detecting fast radio bursts (FRBs) requires software pipelines to search for dispersed single pulses of emission in radio telescope data. In order to enable an unbiased estimation of the underlying FRB population, it is important to understand the algorithm efficiency with respect to the search parameter space and thus the survey completeness. The Fast Real-time Engine for Dedispersing Amplitudes (fredda) search pipeline is a single pulse detection pipeline designed to identify radio pulses over a large range of dispersion measures (DM) with low latency. It is used on the Australian Square Kilometre Array Pathfinder (ASKAP) for the Commensal Real-time ASKAP Fast Transients (CRAFT) project. We utilize simulated single pulses in the low- and high-frequency observation bands of ASKAP to analyse the performance of the pipeline and infer the underlying FRB population. The simulation explores the signal-to-noise ratio (S/N) recovery as a function of DM and the temporal duration of FRB pulses in comparison to injected values. The effects of intrachannel broadening caused by dispersion are also carefully studied in this work using control data sets. Our results show that for Gaussian-like single pulses, & per cent of the injected signal is recovered by pipelines such as fredda at DM & pc cm−3 using standard boxcar filters compared to an ideal incoherent dedispersion match filter. Further calculations with sensitivity implies at least ∼10 per cent of FRBs in a Euclidean universe at target sensitivity will be missed by fredda and heimdall, another common pipeline, in ideal radio environments at 1.1 GHz.
Astrometric accuracy of snapshot fast radio burst localisations with ASKAP
Publisher: Cambridge University Press (CUP)
Date: 2021
DOI: 10.1017/PASA.2021.40
Abstract: The recent increase in well-localised fast radio bursts (FRBs) has facilitated in-depth studies of global FRB host properties, the source circumburst medium, and the potential impacts of these environments on the burst properties. The Australian Square Kilometre Array Pathfinder (ASKAP) has localised 11 FRBs with sub-arcsecond to arcsecond precision, leading to sub-galaxy localisation regions in some cases and those covering much of the host galaxy in others. The method used to astrometrically register the FRB image frame for ASKAP, in order to align it with images taken at other wavelengths, is currently limited by the brightness of continuum sources detected in the short-duration (‘snapshot’) voltage data captured by the Commensal Real-Time ASKAP Fast Transients (CRAFT) software correlator, which are used to correct for any frame offsets due to imperfect calibration solutions and estimate the accuracy of any required correction. In this paper, we use dedicated observations of bright, compact radio sources in the low- and mid-frequency bands observable by ASKAP to investigate the typical astrometric accuracy of the positions obtained using this so-called ‘snapshot’ technique. Having captured these data with both the CRAFT software and ASKAP hardware correlators, we also compare the offset distributions obtained from both data products to estimate a typical offset between the image frames resulting from the differing processing paths, laying the groundwork for future use of the longer duration, higher signal-to-noise ratio (S/N) data recorded by the hardware correlator. We find typical offsets between the two frames of ${\\sim}0.6$ and ${\\sim}0.3$ arcsec in the low- and mid-band data, respectively, for both RA and Dec. We also find reasonable agreement between our offset distributions and those of the published FRBs. We detect only a weak dependence in positional offset on the relative separation in time and elevation between target and calibrator scans, with the trends being more pronounced in the low-band data and in Dec. Conversely, the offsets show a clear dependence on frequency in the low band, which we compare to the frequency-dependent Dec. offsets found in FRB 200430. In addition, we present a refined methodology for estimating the overall astrometric accuracy of CRAFT FRBs.
Related Organisations
Friedrich-Alexander-Universität Erlangen-Nürnberg
Location: No location found
International Centre For Radio Astronomy Research
Location: Australia
Curtin University Curtin Institute Of Radio Astronomy
Location: Australia
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