6081 20240122121900.0 10.1051/0004-6361/202243709 DOI SCART-2023-0039 Gaia Collaboration Gaia Data Release 3: The Galaxy in your preferred colours. Synthetic photometry from Gaia low-resolution spectra 2023 Gaia Data Release 3 provides novel flux-calibrated low-resolution spectrophotometry for ~ 220 million sources in the wavelength range 330 nm <= lambda <= 1050 nm (XP spectra). Synthetic photometry directly tied to a flux in physical units can be obtained from these spectra for any passband fully enclosed in this wavelength range. We describe how synthetic photometry can be obtained from XP spectra, illustrating the performance that can be achieved under a range of different conditions —for example passband width and wavelength range — as well as the limits and the problems affecting it. Existing top-quality photometry can be reproduced within a few per cent over a wide range of magnitudes and colour, for wide and medium bands, and with up to millimag accuracy when synthetic photometry is standardised with respect to these external sources. Some examples of potential scientific application are presented, including the detection of multiple populations in globular clusters, the estimation of metallicity extended to the very metal-poor regime, and the classification of white dwarfs. A catalogue providing standardised photometry for ~2.2x10^8 sources in several wide bands of widely used photometric systems is provided (Gaia Synthetic Photometry Catalogue; GSPC) as well as a catalogue of ~10^5 white dwarfs with DA/non-DA classification obtained with a Random Forest algorithm (Gaia Synthetic Photometry Catalogue for White Dwarfs; GSPC-WD). Gaia PRODEX/ Gaia PRODEX/ Gaia PRODEX NO Catalogs surveys techniques: photometric; spectroscopic Galaxy: general Montegriffo, P. Bellazzini, M. De Angeli, F. Andrae, R. Barstow, M.A. Bossini, D. Bragaglia, A. Burgess, P.W. Cacciari, C. Carrasco, J.M. Chornay, N. Delchambre, L. Evans, D.W. Fouesneau, M. Frémat, Y. Garabato, D. Jordi, C. Manteiga, M. Massari, D. Palaversa, L. Pancino, E. Riello, M. Ruz Mieres, D. Sanna, N. Santoveña, R. Sordo, R. Vallenari, A. Walton, N.A. Brown, A.G.A. Prusti, T. de Bruijne, J.H.J. Arenou, F. Babusiaux, C. Biermann, M. Creevey, O.L. Ducourant, C. Eyer, L. Guerra, R. Hutton, A. Klioner, S.A. Lammers, U.L. Lindegren, L. Luri, X. Mignard, F. Panem, C. Pourbaix, D. Randich, S. Sartoretti, P. Soubiran, C. Tanga, P. Bailer-Jones, C.A.L. Bastian, U. Drimmel, R. Jansen, F. Katz, D. Lattanzi, M.G. van Leeuwen, F. Bakker, J. Castañeda, J. Fabricius, C. Galluccio, L. Guerrier, A. Heiter, U. Masana, E. Messineo, R. Mowlavi, N. Nicolas, C. Nienartowicz, K. Pailler, F. Panuzzo, P. Riclet, F. Roux, W. Seabroke, G.M. Thévenin, F. Gracia-Abril, G. Portell, J. Teyssier, D. Altmann, M. Audard, M. Bellas-Velidis, I. Benson, K. Berthier, J. Blomme, R. Busonero, D. Busso, G. Cánovas, H. Carry, B. Cellino, A. Cheek, N. Clementini, G. Damerdji, Y. Davidson, M. de Teodoro, P. Nuñez Campos, M. Dell’Oro, A. Esquej, P. Fernández-Hernández, J. Fraile, E. García-Lario, P. Gosset, E. Haigron, R. Halbwachs, J.-L. Hambly, N.C. Harrison, D.L. Hernández, J. Hestroffer, D. Hodgkin, S.T. Holl, B. Janßen, K. Jevardat de Fombelle, G. Jordan, S. Krone-Martins, A. Lanzafame, A.C. Löffler, W. Marchal, O. Marrese, P.M. Moitinho, A. Muinonen, K. Osborne, P. Pauwels, T. Recio-Blanco, A. Reylé, C. Rimoldini, L. Roegiers, T. Rybizki, J. Sarro, L.M. Siopis, C. Smith, M. Sozzetti, A. Utrilla, E. van Leeuwen, M. Abbas, U. Ábrahám, P. Abreu Aramburu, A. Aerts, C. Aguado, J.J. Ajaj, M. Aldea-Montero, F. Altavilla, G. Álvarez, M.A. Alves, J. Anderson, R.I. Anglada Varela, E. Antoja, T. Baines, D. Baker, S.G. Balaguer-Núñez, L. Balbinot, E. Balog, Z. Barache, C. Barbato, D. Barros, M. Bartolomé, S. Bassilana, J.-L. Bauchet, N. Becciani, U. Berihuete, A. Bernet, M. Bertone, S. Bianchi, L. Binnenfeld, A. Blanco-Cuaresma, S. Boch, T. Bombrun, A. Bouquillon, S. Bramante, L. Breedt, E. Bressan, A. Brouillet, N. Brugaletta, E. Bucciarelli, B. Burlacu, A. Butkevich, A.G. Buzzi, R. Caffau, E. Cancelliere, R. Cantat-Gaudin, T. Carballo, R. Carlucci, T. Carnerero, M.I. Casamiquela, L. Castellani, M. Castro-Ginard, A. Chaoul, L. Charlot, P. Chemin, L. Chiaramida, V. Chiavassa, A. Comoretto, G. Contursi, G. Cooper, W.J. Cornez, T. Cowell, S. Crifo, F. Cropper, M. Crosta, M. Crowley, C. Dafonte, C. Dapergolas, A. David, P. de Laverny, P. De Luise, F. De March, R. De Ridder, J. de Souza, R. de Torres, A. del Peloso, E.F. del Pozo, E. Delbo, M. Delgado, A. Delisle, J.-B. Demouchy, C. Dharmawardena, T.E. Diakite, S. Diener, C. Distefano, E. Dolding, C. Enke, H. Fabre, C. Fabrizio, M. Faigler, S. Fedorets, G. Fernique, P. Figueras, F. Fournier, Y. Fouron, C. Fragkoudi, F. Gai, M. Garcia-Gutierrez, A. Garcia-Reinaldos, M. García-Torres, M. Garofalo, A. Gavel, A. Gavras, P. Gerlach, E. Geyer, R. Giacobbe, P. Gilmore, G. Girona, S. Giuffrida, G. Gomel, R. Gomez, A. González-Núñez, J. González-Santamaría, I. González-Vidal, J.J. Granvik, M. Guillout, P. Guiraud, J. Gutiérrez-Sánchez, R. Guy, L.P. Hatzidimitriou, D. Hauser, M. Haywood, M. Helmer, A. Helmi, A. Sarmiento, M.H. Hidalgo, S.L. Hładczuk, N. Hobbs, D. Holland, G. Huckle, H.E. Jardine, K. Jasniewicz, G. Jean-Antoine Piccolo, A. Jiménez-Arranz, Ó. Juaristi Campillo, J. Julbe, F. Karbevska, L. Kervella, P. Khanna, S. Kordopatis, G. Korn, A.J. Kóspál, Á Kostrzewa-Rutkowska, Z. Kruszy´nska, K. Kun, M. Laizeau, P. Lambert, S. Lanza, A.F. Lasne, Y. Le Campion, J.-F. Lebreton, Y. Lebzelter, T. Leccia, S. Leclerc, N. Lecoeur-Taibi, I. Liao, S. Licata, E.L. Lindstrøm, H.E.P. Lister, T.A. Livanou, E. Lobel, A. Lorca, A. Loup, C. Madrero Pardo, P. Magdaleno Romeo, A. Managau, S. Mann, R.G. Marchant, J.M. Marconi, M. Marcos, J. Marcos Santos, M.M.S. Marín Pina, D. Marinoni, S. Marocco, F. Marshall, D.J. Martin Polo, L. Martín-Fleitas, J.M. Marton, G. Mary, N. Masip, A. Mastrobuono-Battisti, A. Mazeh, T. McMillan, P.J. Messina, S. Michalik, D. Millar, N.R. Mints, A. Molina, D. Molinaro, R. Molnár, L. Monari, G. Monguió, M. Montero, A. Mor, R. Mora, A. Morbidelli, R. Morel, T. Morris, D. Muraveva, T. Murphy, C.P. Musella, I. Nagy, Z. Noval, L. Ocaña, F. Ogden, A. Ordenovic, C. Osinde, J.O. Pagani, C. Pagano, I. Palicio, P.A. Pallas-Quintela, L. Panahi, A. Payne-Wardenaar, S. Peñalosa Esteller, X. Penttilä, A. Pichon, B. Piersimoni, A.M. Pineau, F.-X. Plachy, E. Plum, G. Poggio, E. Prša, A. Pulone, L. Racero, E. Ragaini, S. Rainer, M. Raiteri, C.M. Ramos, P. Ramos-Lerate, M. Re Fiorentin, P. Regibo, S. Richards, P.J. Rios Diaz, C. Ripepi, V. Riva, A. Rix, H.-W. Rixon, G. Robichon, N. Robin, A.C. Robin, C. Roelens, M. Rogues, H.R.O. Rohrbasser, L. Romero-Gómez, M. Rowell, N. Royer, F. Rybicki, K.A. Sadowski, G. Sáez Núñez, A. Sagristà Sellés, A. Sahlmann, J. Salguero, E. Samaras, N. Sanchez Gimenez, V. Sarasso, M. Schultheis, M.S. Sciacca, E. Segol, M. Segovia, J.C. Ségransan, D. Semeux, D. Shahaf, S. Siddiqui, H.I. Siebert, A. Siltala, L. Silvelo, A. Slezak, E. Slezak, I. Smart, R.L. Snaith, O.N. Solano, E. Solitro, F. Souami, D. Souchay, J. Spagna, A. Spina, L. Spoto, F. Steele, I.A. Steidelmüller, H. Stephenson, C.A. Süveges, M. Surdej, J. Szabados, L. Szegedi-Elek, E. Taris, F. Taylor, M.B. Teixeira, R. Tolomei, L. Tonello, N. Torra, F. Torra, J. Torralba Elipe, G. Trabucchi, M. Tsounis, A.T. Turon, C. Ulla, A. Unger, N. Vaillant, M.V. van Dillen, E. van Reeven, W. Vanel, O. Vecchiato, A. Viala, Y. Vicente, D. Voutsinas, S. Wevers, T. Wyrzykowski, Ł. Yoldas, A. Yvard, P. Zhao, H. Zorec, J. Zucker, S. Zwitter, T. Astronomy & Astrophysics 674 2023 A33 (58 pp) ronny.blomme@observatoire.be https://ui.adsabs.harvard.edu/abs/2022arXiv220606215G/abstract https://arxiv.org/abs/2206.06215 published in REFERD