@article{073a70160cab48508c04c6eef71b8b4f,
title = "Gaia Data Release 3. The extragalactic content",
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 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. ",
keywords = "Galaxies: general, Quasars: general, Surveys",
author = "{Gaia Collaboration} and Bailer-Jones, {C. A. L.} and D. Teyssier and L. Delchambre and C. Ducourant and D. Garabato and D. Hatzidimitriou and Klioner, {S. A.} and L. Rimoldini and I. Bellas-Velidis and R. Carballo and Carnerero, {M. I.} and C. Diener and M. Fouesneau and L. Galluccio and P. Gavras and A. Krone-Martins and Raiteri, {C. M.} and R. Teixeira and Brown, {A. G. A.} and A. Vallenari and T. Prusti and Bruijne, {J. H. J. de} and F. Arenou and C. Babusiaux and M. Biermann and Creevey, {O. L.} and Evans, {D. W.} and L. Eyer and R. Guerra and A. Hutton and C. Jordi and Lammers, {U. L.} and L. Lindegren and X. Luri and F. Mignard and C. Panem and D. Pourbaix and S. Randich and P. Sartoretti and C. Soubiran and P. Tanga and Walton, {N. A.} and U. Bastian and R. Drimmel and F. Jansen and D. Katz and Lattanzi, {M. G.} and Leeuwen, {F. van} and J. Bakker and C. Cacciari and J. Casta{\~n}eda and Angeli, {F. De} and C. Fabricius and Y. Fr{\'e}mat and A. Guerrier and U. Heiter and E. Masana and R. Messineo and N. Mowlavi and C. Nicolas and K. Nienartowicz and F. Pailler and P. Panuzzo and F. Riclet and W. Roux and Seabroke, {G. M.} and R. Sordo and F. Th{\'e}venin and G. Gracia-Abril and J. Portell and M. Altmann and R. Andrae and M. Audard and K. Benson and J. Berthier and R. Blomme and Burgess, {P. W.} and D. Busonero and G. Busso and H. C{\'a}novas and B. Carry and A. Cellino and N. Cheek and G. Clementini and Y. Damerdji and M. Davidson and Teodoro, {P. de} and Campos, {M. Nu{\~n}ez} and A. Dell'Oro and P. Esquej and J. Fern{\'a}ndez-Hern{\'a}ndez and E. Fraile and P. Garc{\'i}a-Lario and E. Gosset and R. Haigron and Halbwachs, {J. -L.} and Hambly, {N. C.} and Harrison, {D. L.} and J. Hern{\'a}ndez and D. Hestroffer and Hodgkin, {S. T.} and B. Holl and K. Jan{\ss}en and Fombelle, {G. Jevardat de} and S. Jordan and Lanzafame, {A. C.} and W. L{\"o}ffler and O. Marchal and Marrese, {P. M.} and A. Moitinho and K. Muinonen and P. Osborne and E. Pancino and T. Pauwels and A. Recio-Blanco and C. Reyl{\'e} and M. Riello and T. Roegiers and J. Rybizki and Sarro, {L. M.} and C. Siopis and M. Smith and A. Sozzetti and E. Utrilla and Leeuwen, {M. van} and U. Abbas and P. {\'A}brah{\'a}m and Aramburu, {A. Abreu} and C. Aerts and Aguado, {J. J.} and M. Ajaj and F. Aldea-Montero and G. Altavilla and {\'A}lvarez, {M. A.} and J. Alves and Anderson, {R. I.} and Varela, {E. Anglada} and T. Antoja and D. Baines and Baker, {S. G.} and L. Balaguer-N{\'u}{\~n}ez and E. Balbinot and Z. Balog and C. Barache and D. Barbato and M. Barros and Barstow, {M. A.} and S. Bartolom{\'e} and Bassilana, {J. -L.} and N. Bauchet and U. Becciani and M. Bellazzini and A. Berihuete and M. Bernet and S. Bertone and L. Bianchi and A. Binnenfeld and S. Blanco-Cuaresma and T. Boch and A. Bombrun and D. Bossini and S. Bouquillon and A. Bragaglia and L. Bramante and E. Breedt and A. Bressan and N. Brouillet and E. Brugaletta and B. Bucciarelli and A. Burlacu and Butkevich, {A. G.} and R. Buzzi and E. Caffau and R. Cancelliere and T. Cantat-Gaudin and T. Carlucci and Carrasco, {J. M.} and L. Casamiquela and M. Castellani and A. Castro-Ginard and L. Chaoul and P. Charlot and L. Chemin and V. Chiaramida and A. Chiavassa and N. Chornay and G. Comoretto and G. Contursi and Cooper, {W. J.} and T. Cornez and S. Cowell and F. Crifo and M. Cropper and M. Crosta and C. Crowley and C. Dafonte and A. Dapergolas and P. David and Laverny, {P. de} and Luise, {F. De} and March, {R. De} and Ridder, {J. De} and Souza, {R. de} and Torres, {A. de} and Peloso, {E. F. del} and Pozo, {E. del} and M. Delbo and A. Delgado and Delisle, {J. -B.} and C. Demouchy and Dharmawardena, {T. E.} and S. Diakite and E. Distefano and C. Dolding and H. Enke and C. Fabre and M. Fabrizio and S. Faigler and G. Fedorets and P. Fernique and F. Figueras and Y. Fournier and C. Fouron and F. Fragkoudi and M. Gai and A. Garcia-Gutierrez and M. Garcia-Reinaldos and M. Garc{\'i}a-Torres and A. Garofalo and A. Gavel and E. Gerlach and R. Geyer and P. Giacobbe and G. Gilmore and S. Girona and G. Giuffrida and R. Gomel and A. Gomez and J. Gonz{\'a}lez-N{\'u}{\~n}ez and I. Gonz{\'a}lez-Santamar{\'i}a and Gonz{\'a}lez-Vidal, {J. J.} and M. Granvik and P. Guillout and J. Guiraud and R. Guti{\'e}rrez-S{\'a}nchez and Guy, {L. P.} and M. Hauser and M. Haywood and A. Helmer and A. Helmi and Sarmiento, {M. H.} and Hidalgo, {S. L.} and N. H{\l}adczuk and D. Hobbs and G. Holland and Huckle, {H. E.} and K. Jardine and G. Jasniewicz and Piccolo, {A. Jean-Antoine} and {\'O}. Jim{\'e}nez-Arranz and Campillo, {J. Juaristi} and F. Julbe and L. Karbevska and P. Kervella and S. Khanna and M. Kontizas and G. Kordopatis and Korn, {A. J.} and {\'A} K{\'o}sp{\'a}l and Z. Kostrzewa-Rutkowska and K. Kruszy{\'n}ska and M. Kun and P. Laizeau and S. Lambert and Lanza, {A. F.} and Y. Lasne and Campion, {J. -F. Le} and Y. Lebreton and T. Lebzelter and S. Leccia and N. Leclerc and I. Lecoeur-Taibi and S. Liao and Licata, {E. L.} and Lindstr{\o}m, {H. E. P.} and Lister, {T. A.} and E. Livanou and A. Lobel and A. Lorca and C. Loup and Pardo, {P. Madrero} and Romeo, {A. Magdaleno} and S. Managau and Mann, {R. G.} and M. Manteiga and Marchant, {J. M.} and M. Marconi and J. Marcos and Santos, {M. M. S. Marcos} and Pina, {D. Mar{\'i}n} and S. Marinoni and F. Marocco and Marshall, {D. J.} and Polo, {L. Martin} and Mart{\'i}n-Fleitas, {J. M.} and G. Marton and N. Mary and A. Masip and D. Massari and A. Mastrobuono-Battisti and T. Mazeh and McMillan, {P. J.} and S. Messina and D. Michalik and Millar, {N. R.} and A. Mints and D. Molina and R. Molinaro and L. Moln{\'a}r and G. Monari and M. Mongui{\'o} and P. Montegriffo and A. Montero and R. Mor and A. Mora and R. Morbidelli and T. Morel and D. Morris and T. Muraveva and Murphy, {C. P.} and I. Musella and Z. Nagy and L. Noval and F. Oca{\~n}a and A. Ogden and C. Ordenovic and Osinde, {J. O.} and C. Pagani and I. Pagano and L. Palaversa and Palicio, {P. A.} and L. Pallas-Quintela and A. Panahi and S. Payne-Wardenaar and Esteller, {X. Pe{\~n}alosa} and A. Penttil{\"a} and B. Pichon and Piersimoni, {A. M.} and Pineau, {F. -X.} and E. Plachy and G. Plum and E. Poggio and A. Pr{\v s}a and L. Pulone and E. Racero and S. Ragaini and M. Rainer and P. Ramos and M. Ramos-Lerate and Fiorentin, {P. Re} and S. Regibo and Richards, {P. J.} and Diaz, {C. Rios} and V. Ripepi and A. Riva and Rix, {H. -W.} and G. Rixon and N. Robichon and Robin, {A. C.} and C. Robin and M. Roelens and Rogues, {H. R. O.} and L. Rohrbasser and M. Romero-G{\'o}mez and N. Rowell and F. Royer and Mieres, {D. Ruz} and Rybicki, {K. A.} and G. Sadowski and N{\'u}{\~n}ez, {A. S{\'a}ez} and Sell{\'e}s, {A. Sagrist{\`a}} and J. Sahlmann and E. Salguero and N. Samaras and Gimenez, {V. Sanchez} and N. Sanna and R. Santove{\~n}a and M. Sarasso and Schultheis, {M. S.} and E. Sciacca and M. Segol and Segovia, {J. C.} and D. S{\'e}gransan and D. Semeux and S. Shahaf and Siddiqui, {H. I.} and A. Siebert and L. Siltala and A. Silvelo and E. Slezak and I. Slezak and Smart, {R. L.} and Snaith, {O. N.} and E. Solano and F. Solitro and D. Souami and J. Souchay and A. Spagna and L. Spina and F. Spoto and Steele, {I. A.} and H. Steidelm{\"u}ller and Stephenson, {C. A.} and M. S{\"u}veges and J. Surdej and L. Szabados and E. Szegedi-Elek and F. Taris and Taylor, {M. B.} and L. Tolomei and N. Tonello and F. Torra and J. Torra and Elipe, {G. Torralba} and M. Trabucchi and Tsounis, {A. T.} and C. Turon and A. Ulla and N. Unger and Vaillant, {M. V.} and Dillen, {E. van} and Reeven, {W. van} and O. Vanel and A. Vecchiato and Y. Viala and D. Vicente and S. Voutsinas and M. Weiler and T. Wevers and {\L}. Wyrzykowski and A. Yoldas and P. Yvard and H. Zhao and J. Zorec and S. Zucker and T. Zwitter",
note = "Accepted to A&A Publisher Copyright: {\textcopyright} 2023 EDP Sciences. All rights reserved.",
year = "2023",
month = jun,
day = "16",
doi = "10.1051/0004-6361/202243232",
language = "English",
volume = "674",
pages = "1--33",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}