ORCID Profile
0000-0002-3849-9164
Current Organisation
CNRS
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Publisher: American Physical Society (APS)
Date: 04-10-2017
Publisher: Elsevier BV
Date: 09-2010
Publisher: American Astronomical Society
Date: 25-04-2018
Publisher: American Association for the Advancement of Science (AAAS)
Date: 27-06-2008
Abstract: The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts.
Publisher: Elsevier BV
Date: 08-2007
Publisher: American Astronomical Society
Date: 04-2023
Abstract: We describe the Milky Way Survey (MWS) that will be undertaken with the Dark Energy Spectroscopic Instrument (DESI) on the Mayall 4 m telescope at the Kitt Peak National Observatory. Over the next 5 yr DESI MWS will observe approximately seven million stars at Galactic latitudes ∣ b ∣ 20°, with an inclusive target selection scheme focused on the thick disk and stellar halo. MWS will also include several high-completeness s les of rare stellar types, including white dwarfs, low-mass stars within 100 pc of the Sun, and horizontal branch stars. We summarize the potential of DESI to advance understanding of the Galactic structure and stellar evolution. We introduce the final definitions of the main MWS target classes and estimate the number of stars in each class that will be observed. We describe our pipelines for deriving radial velocities, atmospheric parameters, and chemical abundances. We use ≃500,000 spectra of unique stellar targets from the DESI Survey Validation program (SV) to demonstrate that our pipelines can measure radial velocities to ≃1 km s −1 and [Fe/H] accurate to ≃0.2 dex for typical stars in our main s le. We find the stellar parameter distributions from ≈100 deg 2 of SV observations with ≳90% completeness on our main s le are in good agreement with expectations from mock catalogs and previous surveys.
Publisher: Elsevier BV
Date: 08-2018
No related grants have been discovered for Miguel Sanchez-Conde.