Gaia Data Release 3

, P. Montegriffo, M. Bellazzini, F. De Angeli, R. Andrae, M. A. Barstow, D. Bossini, A. Bragaglia, P. W. Burgess, C. Cacciari, J. M. Carrasco, N. Chornay, L. Delchambre, D. W. Evans, M. Fouesneau, Y. Frémat, D. Garabato, C. Jordi, M. Manteiga, D. Massari, L. Palaversa, E. Pancino, M. Riello, D. Ruz Mieres, N. Sanna, R. Santoveña, R. Sordo, A. Vallenari, N. A. Walton, A. G.A. Brown, T. Prusti, J. H.J. De Bruijne, F. Arenou, C. Babusiaux, M. Biermann, O. L. Creevey, C. Ducourant, L. Eyer, R. Guerra, A. Hutton, S. A. Klioner, U. L. Lammers, L. Lindegren, X. Luri, F. Mignard, C. Panem, D. Pourbaix, S. Randich, P. Sartoretti, J. Alves, T. Lebzelter

Gaia Data Release 3 provides novel flux-calibrated low-resolution spectrophotometry for '220 million sources in the wavelength range 330 nm ≤ λ ≤ 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 2.2×108sources in several wide bands of widely used photometric systems is provided (Gaia Synthetic Photometry Catalogue; GSPC) as well as a catalogue of '105 white dwarfs with DA/non-DA classification obtained with a Random Forest algorithm (Gaia Synthetic Photometry Catalogue for White Dwarfs; GSPC-WD).

Department of Astrophysics
External organisation(s)
Instituto Nazionale die Astrofisica (INAF), University of Cambridge, Max-Planck-Institut für Astronomie, University of Leicester, Universidade do Porto, Universitat de Barcelona, Université de Liège, Royal Observatory of Belgium, Universidade da Coruña, Rudjer Boskovic Institute, INAF - Osservatorio Astrofisico di Arcetri, Space Science Data Center (SSDC) - Agenzia Spaziale Italiana (ASI), Osservatorio Astronomico, Leiden University, Science and Operations Department - Science Division (SCI-SC), Paris Observatory, University of Grenoble Alpes, Scientific Software Center, Université Côte d'Azur, Laboratoire d'Astrophysique de Bordeaux, Université de Genève, European Space Astronomy Centre (ESA), Technische Universität Dresden, Lund Observatory, Centre national d'études spatiales (CNES), Université Libre de Bruxelles, Fonds de la Recherche Scientifique – FNRS
Astronomy and Astrophysics
No. of pages
Publication date
Peer reviewed
Austrian Fields of Science 2012
103003 Astronomy, 103004 Astrophysics
ASJC Scopus subject areas
Astronomy and Astrophysics, Space and Planetary Science
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