Gaia Data Release 3: The extragalactic content
Creators: name: Gaia Collaboration
name: Bailer-Jones, C. A. L.
name: Teyssier, D.
name: Delchambre, L.
name: Ducourant, C.
name: Garabato, D.
name: Hatzidimitriou, D.
name: Klioner, S. A.
name: Rimoldini, L.
name: Bellas-Velidis, I.
name: Carballo, R.
name: Carnerero, M. I.
name: Diener, C.
name: Fouesneau, M.
name: Galluccio, L.
name: Gavras, P.
name: Krone-Martins, A.
name: Raiteri, C. M.
name: Teixeira, R.
name: Brown, A. G. A.
name: Vallenari, A.
name: Prusti, T.
name: de Bruijne, J. H. J.
name: Arenou, F.
name: Babusiaux, C.
name: Biermann, M.
name: Creevey, O. L.
name: Evans, D. W.
name: Eyer, L.
name: Guerra, R.
name: Hutton, A.
name: Jordi, C.
name: Lammers, U. L.
name: Lindegren, L.
name: Luri, X.
name: Mignard, F.
name: Panem, C.
name: Pourbaix, D.
name: Randich, S.
name: Sartoretti, P.
name: Soubiran, C.
name: Tanga, P.
name: Walton, N. A.
name: Bastian, U.
name: Drimmel, R.
name: Jansen, F.
name: Katz, D.
name: Lattanzi, M. G.
name: van Leeuwen, F.
name: Bakker, J.
name: Cacciari, C.
name: Castañeda, J.
name: De Angeli, F.
name: Fabricius, C.
name: Frémat, Y.
name: Guerrier, A.
name: Heiter, U.
name: Masana, E.
name: Messineo, R.
name: Mowlavi, N.
name: Nicolas, C.
name: Nienartowicz, K.
name: Pailler, F.
name: Panuzzo, P.
name: Riclet, F.
name: Roux, W.
name: Seabroke, G. M.
name: Sordo, R.
name: Thévenin, F.
name: Gracia-Abril, G.
name: Portell, J.
name: Altmann, M.
name: Andrae, R.
name: Audard, M.
name: Benson, K.
name: Berthier, J.
name: Blomme, R.
name: Burgess, P. W.
name: Busonero, D.
name: Busso, G.
name: Cánovas, H.
name: Carry, B.
name: Cellino, A.
name: Cheek, N.
name: Clementini, G.
name: Damerdji, Y.
name: Davidson, M.
name: de Teodoro, P.
name: Campos, M. Nuñez
name: Dell'Oro, A.
name: Esquej, P.
name: Fernández-Hernández, J.
name: Fraile, E.
name: García-Lario, P.
name: Gosset, E.
name: Haigron, R.
name: Halbwachs, J. -L.
name: Hambly, N. C.
name: Harrison, D. L.
name: Hernández, J.
name: Hestroffer, D.
name: Hodgkin, S. T.
name: Holl, B.
name: Janßen, K.
name: de Fombelle, G. Jevardat
name: Jordan, S.
name: Lanzafame, A. C.
name: Löffler, W.
name: Marchal, O.
name: Marrese, P. M.
name: Moitinho, A.
name: Muinonen, K.
name: Osborne, P.
name: Pancino, E.
name: Pauwels, T.
name: Recio-Blanco, A.
name: Reylé, C.
name: Riello, M.
name: Roegiers, T.
name: Rybizki, J.
name: Sarro, L. M.
name: Siopis, C.
name: Smith, M.
name: Sozzetti, A.
name: Utrilla, E.
name: van Leeuwen, M.
name: Abbas, U.
name: Ábrahám, P.
name: Aramburu, A. Abreu
name: Aerts, C.
name: Aguado, J. J.
name: Ajaj, M.
name: Aldea-Montero, F.
name: Altavilla, G.
name: Álvarez, M. A.
name: Alves, J.
name: Anderson, R. I.
name: Varela, E. Anglada
name: Antoja, T.
name: Baines, D.
name: Baker, S. G.
name: Balaguer-Núñez, L.
name: Balbinot, E.
name: Balog, Z.
name: Barache, C.
name: Barbato, D.
name: Barros, M.
name: Barstow, M. A.
name: Bartolomé, S.
name: Bassilana, J. -L.
name: Bauchet, N.
name: Becciani, U.
name: Bellazzini, M.
name: Berihuete, A.
name: Bernet, M.
name: Bertone, S.
name: Bianchi, L.
name: Binnenfeld, A.
name: Blanco-Cuaresma, S.
name: Boch, T.
name: Bombrun, A.
name: Bossini, D.
name: Bouquillon, S.
name: Bragaglia, A.
name: Bramante, L.
name: Breedt, E.
name: Bressan, A.
name: Brouillet, N.
name: Brugaletta, E.
name: Bucciarelli, B.
name: Burlacu, A.
name: Butkevich, A. G.
name: Buzzi, R.
name: Caffau, E.
name: Cancelliere, R.
name: Cantat-Gaudin, T.
name: Carlucci, T.
name: Carrasco, J. M.
name: Casamiquela, L.
name: Castellani, M.
name: Castro-Ginard, A.
name: Chaoul, L.
name: Charlot, P.
name: Chemin, L.
name: Chiaramida, V.
name: Chiavassa, A.
name: Chornay, N.
name: Comoretto, G.
name: Contursi, G.
name: Cooper, W. J.
name: Cornez, T.
name: Cowell, S.
name: Crifo, F.
name: Cropper, M.
name: Crosta, M.
name: Crowley, C.
name: Dafonte, C.
name: Dapergolas, A.
name: David, P.
name: de Laverny, P.
name: De Luise, F.
name: De March, R.
name: De Ridder, J.
name: de Souza, R.
name: de Torres, A.
name: del Peloso, E. F.
name: del Pozo, E.
name: Delbo, M.
name: Delgado, A.
name: Delisle, J. -B.
name: Demouchy, C.
name: Dharmawardena, T. E.
name: Diakite, S.
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name: Faigler, S.
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name: Figueras, F.
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name: Gai, M.
name: Garcia-Gutierrez, A.
name: Garcia-Reinaldos, M.
name: García-Torres, M.
name: Garofalo, A.
name: Gavel, A.
name: Gerlach, E.
name: Geyer, R.
name: Giacobbe, P.
name: Gilmore, G.
name: Girona, S.
name: Giuffrida, G.
name: Gomel, R.
name: Gomez, A.
name: González-Núñez, J.
name: González-Santamaría, I.
name: González-Vidal, J. J.
name: Granvik, M.
name: Guillout, P.
name: Guiraud, J.
name: Gutiérrez-Sánchez, R.
name: Guy, L. P.
name: Hauser, M.
name: Haywood, M.
name: Helmer, A.
name: Helmi, A.
name: Sarmiento, M. H.
name: Hidalgo, S. L.
name: Hładczuk, N.
name: Hobbs, D.
name: Holland, G.
name: Huckle, H. E.
name: Jardine, K.
name: Jasniewicz, G.
name: Piccolo, A. Jean-Antoine
name: Jiménez-Arranz, Ó.
name: Campillo, J. Juaristi
name: Julbe, F.
name: Karbevska, L.
name: Kervella, P.
name: Khanna, S.
name: Kontizas, M.
name: Kordopatis, G.
name: Korn, A. J.
name: Kóspál, Á
name: Kostrzewa-Rutkowska, Z.
name: Kruszyńska, K.
name: Kun, M.
name: Laizeau, P.
name: Lambert, S.
name: Lanza, A. F.
name: Lasne, Y.
name: Campion, J. -F. Le
name: Lebreton, Y.
name: Lebzelter, T.
name: Leccia, S.
name: Leclerc, N.
name: Lecoeur-Taibi, I.
name: Liao, S.
name: Licata, E. L.
name: Lindstrøm, H. E. P.
name: Lister, T. A.
name: Livanou, E.
name: Lobel, A.
name: Lorca, A.
name: Loup, C.
name: Pardo, P. Madrero
name: Romeo, A. Magdaleno
name: Managau, S.
name: Mann, R. G.
name: Manteiga, M.
name: Marchant, J. M.
name: Marconi, M.
name: Marcos, J.
name: Santos, M. M. S. Marcos
name: Pina, D. Marín
name: Marinoni, S.
name: Marocco, F.
name: Marshall, D. J.
name: Polo, L. Martin
name: Martín-Fleitas, J. M.
name: Marton, G.
name: Mary, N.
name: Masip, A.
name: Massari, D.
name: Mastrobuono-Battisti, A.
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name: McMillan, P. J.
name: Messina, S.
name: Michalik, D.
name: Millar, N. R.
name: Mints, A.
name: Molina, D.
name: Molinaro, R.
name: Molnár, L.
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name: Ogden, A.
name: Ordenovic, C.
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name: Pagano, I.
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name: Palicio, P. A.
name: Pallas-Quintela, L.
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name: Payne-Wardenaar, S.
name: Esteller, X. Peñalosa
name: Penttilä, A.
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name: Piersimoni, A. M.
name: Pineau, F. -X.
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name: Poggio, E.
name: Prša, A.
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name: Racero, E.
name: Ragaini, S.
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name: Ramos, P.
name: Ramos-Lerate, M.
name: Fiorentin, P. Re
name: Regibo, S.
name: Richards, P. J.
name: Diaz, C. Rios
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name: Rix, H. -W.
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name: Robichon, N.
name: Robin, A. C.
name: Robin, C.
name: Roelens, M.
name: Rogues, H. R. O.
name: Rohrbasser, L.
name: Romero-Gómez, M.
name: Rowell, N.
name: Royer, F.
name: Mieres, D. Ruz
name: Rybicki, K. A.
name: Sadowski, G.
name: Núñez, A. Sáez
name: Sellés, A. Sagristà
name: Sahlmann, J.
name: Salguero, E.
name: Samaras, N.
name: Gimenez, V. Sanchez
name: Sanna, N.
name: Santoveña, R.
name: Sarasso, M.
name: Schultheis, M. S.
name: Sciacca, E.
name: Segol, M.
name: Segovia, J. C.
name: Ségransan, D.
name: Semeux, D.
name: Shahaf, S.
name: Siddiqui, H. I.
name: Siebert, A.
name: Siltala, L.
name: Silvelo, A.
name: Slezak, E.
name: Slezak, I.
name: Smart, R. L.
name: Snaith, O. N.
name: Solano, E.
name: Solitro, F.
name: Souami, D.
name: Souchay, J.
name: Spagna, A.
name: Spina, L.
name: Spoto, F.
name: Steele, I. A.
name: Steidelmüller, H.
name: Stephenson, C. A.
name: Süveges, M.
name: Surdej, J.
name: Szabados, L.
name: Szegedi-Elek, E.
name: Taris, F.
name: Taylor, M. B.
name: Tolomei, L.
name: Tonello, N.
name: Torra, F.
name: Torra, J.
name: Elipe, G. Torralba
name: Trabucchi, M.
name: Tsounis, A. T.
name: Turon, C.
name: Ulla, A.
name: Unger, N.
name: Vaillant, M. V.
name: van Dillen, E.
name: van Reeven, W.
name: Vanel, O.
name: Vecchiato, A.
name: Viala, Y.
name: Vicente, D.
name: Voutsinas, S.
name: Weiler, M.
name: Wevers, T.
name: Wyrzykowski, Ł.
name: Yoldas, A.
name: Yvard, P.
name: Zhao, H.
name: Zorec, J.
name: Zucker, S.
name: Zwitter, T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 72-100 nm.
description: Accepted to A&amp;A