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Gaia Data Release 3. The extragalactic content

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dc.contributor.authorBailer Jones, C. A. L.
dc.contributor.authorTeyssier, D.
dc.contributor.authorDelchambre, L.
dc.contributor.authorDucourant, C.
dc.contributor.authorSarro Baro, Luis Manuel
dc.date.accessioned2024-05-20T11:41:39Z
dc.date.available2024-05-20T11:41:39Z
dc.date.issued2023-06-16
dc.description.abstractThe 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.en
dc.description.versionversión publicada
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202243232
dc.identifier.issn1432-0746
dc.identifier.urihttps://hdl.handle.net/20.500.14468/12428
dc.journal.titleAstronomy & Astrophysics (A&A)
dc.journal.volume674
dc.language.isoen
dc.publisherEDP Sciences
dc.relation.centerE.T.S. de Ingeniería Informática
dc.relation.departmentInteligencia Artificial
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by/4.0
dc.subject.keywordssurveys
dc.subject.keywordsgalaxies: general
dc.subject.keywordsquasars: general
dc.subject.keywordsGalaxy: disk
dc.titleGaia Data Release 3. The extragalactic contentes
dc.typejournal articleen
dc.typeartículoes
dspace.entity.typePublication
relation.isAuthorOfPublication9f881bbd-b55d-43bd-87b0-41f8f72cff48
relation.isAuthorOfPublication.latestForDiscovery9f881bbd-b55d-43bd-87b0-41f8f72cff48
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