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Gaia Data Release 3: The extragalactic content
Max Planck Institute for Astronomy, Knigstuhl 17, 69117 Heidelberg, Germany.
Telespazio UK S.L. for European Space Agency (ESA), Camino Bajo del Castillo, s/n, Urbanizacion Villafranca del Castillo, Villanueva de la Cañada, 28692 Madrid, Spain.ORCID iD: 0000-0002-6261-5292
Institut d Astrophysique et de Géophysique, Université de Liège, 19c, Allée du 6 Août, 4000 Liège, Belgium.ORCID iD: 0000-0003-2559-408x
Laboratoire d Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, Allée Geoffroy Saint-Hilaire, 33615 Pessac, France.ORCID iD: 0000-0003-4843-8979
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2023 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 674, article id A41Article in journal (Refereed) Published
Abstract [en]

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 objects, 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.

Place, publisher, year, edition, pages
EDP Sciences , 2023. Vol. 674, article id A41
Keywords [en]
Galaxies: general, Quasars: general, Surveys
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-100674DOI: 10.1051/0004-6361/202243232ISI: 001024440700040Scopus ID: 2-s2.0-85163530624OAI: oai:DiVA.org:ltu-100674DiVA, id: diva2:1790011
Note

Validerad;2023;Nivå 2;2023-12-11 (hanlid);

Funder: For funding information see Appenix A: Acknowledgements in https://doi.org/10.1051/0004-6361/202243232;

Fulltext license: CC BY

Available from: 2023-08-22 Created: 2023-08-22 Last updated: 2023-12-11Bibliographically approved

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