Gaia Data Release 3. The extragalactic content

Bailer-Jones, C.A.L., Teyssier, D., Delchambre, L., Ducourant, C. y Sarro Baro, Luis Manuel . (2023) Gaia Data Release 3. The extragalactic content. Astronomy & Astrophysics

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Título Gaia Data Release 3. The extragalactic content
Autor(es) Bailer-Jones, C.A.L.
Teyssier, D.
Delchambre, L.
Ducourant, C.
Sarro Baro, Luis Manuel
Materia(s) Ingeniería Informática
Abstract The Gaia Galactic survey mission is designed and optimized to obtain astrometry, photometry, and spectroscopy of nearly two billion stars in our Galaxy. Yet as an all-sky multi-epoch survey, Gaia also observes several million extragalactic objects down to a magnitude of G ∼ 21 mag. Due to the nature of the Gaia onboard-selection algorithms, these are mostly point-source-like objects. Using data provided by the satellite, we have identified quasar and galaxy candidates via supervised machine learning methods, and estimate their redshifts using the low resolution BP/RP spectra. We further characterise the surface brightness profiles of host galaxies of quasars and of galaxies from pre-defined input lists. Here we give an overview of the processing of extragalactic bjects, describe the data products in Gaia DR3, and analyse their properties. Two integrated tables contain the main results for a high completeness, but low purity (50−70%), set of 6.6 million candidate quasars and 4.8 million candidate galaxies. We provide queries that select purer sub-samples of these containing 1.9 million probable quasars and 2.9 million probable galaxies (both ∼95% purity). We also use high quality BP/RP spectra of 43 thousand high probability quasars over the redshift range 0.05−4.36 to construct a composite quasar spectrum spanning restframe wavelengths from 72−1000 nm.
Palabras clave surveys
galaxies: general
quasars: general
Galaxy: disk
Editor(es) EDP Sciences
Fecha 2023-06-16
Formato application/pdf
Identificador bibliuned:95-Lmsarro-0004
http://e-spacio.uned.es/fez/view/bibliuned:95-Lmsarro-0004
DOI - identifier https://doi.org/10.1051/0004-6361/202243232
ISSN - identifier 1432-0746
Nombre de la revista Astronomy & Astrophysics (A&A)
Número de Volumen 674
Publicado en la Revista Astronomy & Astrophysics
Idioma eng
Versión de la publicación publishedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Astronomy & Astrophysics (2023) 674,A 41 está disponible en línea en el sitio web del editor: Astronomy & Astrophysics; https://doi.org/10.1051/0004-6361/202243232
Notas adicionales The registered version of this paper, first published in Astronomy & Astrophysics (2023) 674,A 41 is available online at the publisher's website: Astronomy & Astrophysics; https://doi.org/10.1051/0004-6361/202243232

 
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Creado: Mon, 19 Feb 2024, 21:34:31 CET