ORCID Profile
0000-0001-7335-1803
Current Organisation
Friedrich-Alexander-Universität Erlangen-Nürnberg
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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.
Publisher: IOP Publishing
Date: 13-11-2013
Publisher: IOP Publishing
Date: 24-02-2016
Publisher: EDP Sciences
Date: 28-06-2016
Publisher: IOP Publishing
Date: 06-05-2014
Publisher: Springer Science and Business Media LLC
Date: 29-01-2016
Publisher: Springer Science and Business Media LLC
Date: 10-2013
Publisher: American Astronomical Society
Date: 11-04-2014
Publisher: EDP Sciences
Date: 04-2020
DOI: 10.1051/0004-6361/201834647
Abstract: We present the spectral and timing evolution of the persistent black hole X-ray binary GRS 1758−258 based on almost 12 years of observations using the Rossi X-ray Timing Explorer Proportional Counter Array. While the source was predominantly found in the hard state during this time, it entered the thermally dominated soft state seven times. In the soft state GRS 1758−258 shows a strong decline in flux above 3 keV rather than the pivoting flux around 10 keV more commonly shown by black hole transients. In its 3–20 keV hardness intensity diagram, GRS 1758−258 shows a hysteresis of hard and soft state fluxes typical for transient sources in outburst. The RXTE-PCA and RXTE-ASM long-term light curves do not show any orbital modulations in the range of 2–30 d. However, in the dynamic power spectra significant peaks drift between 18.47 and 18.04 d for the PCA data, while less significant signatures between 19 d and 20 d are seen for the ASM data as well as for the Swift /BAT data. We discuss different models for the hysteresis behavior during state transitions as well as possibilities for the origin of the long term variation in the context of a warped accretion disk.
Publisher: IOP Publishing
Date: 04-12-2015
Publisher: EDP Sciences
Date: 06-2014
Publisher: IOP Publishing
Date: 30-10-2015
Publisher: Springer Science and Business Media LLC
Date: 26-08-2011
Publisher: EDP Sciences
Date: 29-10-2013
Publisher: EDP Sciences
Date: 30-03-2015
Publisher: IOP Publishing
Date: 11-11-2014
Publisher: Springer Science and Business Media LLC
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 18-04-2016
DOI: 10.1038/NPHYS3715
Publisher: Springer Science and Business Media LLC
Date: 02-2014
Location: Switzerland
No related grants have been discovered for Ingo Kreykenbohm.