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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 72-1000 nm.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Bailer-Jones C.A.L., Teyssier D., Delchambre L., Ducourant C., Garabato D., Hatzidimitriou D., Klioner S.A., Rimoldini L., Bellas-Velidis I., Carballo R., Carnerero M.I., Diener C., Fouesneau M., Galluccio L., Gavras P., Krone-Martins A., Raiteri C.M., Teixeira R., Brown A.G.A., Vallenari A., Prusti T., De Bruijne J.H.J., Arenou F., Babusiaux C., Biermann M., Creevey O.L., Evans D.W., Eyer L., Guerra R., Hutton A., Jordi C., Lammers U

 Fuente: Astronomy and Astrophysics, 2023, 674, A41

Editorial: EDP Sciences

 Fecha de publicación: 01/06/2023

Nº de páginas: 33

Tipo de publicación: Artículo de Revista

 DOI: 10.1051/0004-6361/202243232

ISSN: 0004-6361,1432-0746

Proyecto español: ESP2016-80079-C2-1-R

Url de la publicación: https://doi.org/10.1051/0004-6361/202243232

Autores/as

BAILER-JONES, CORYN A.L.

TEYSSIER, DAVID

DELCHAMBRE, LUDOVIC

DUCOURANT, CHRISTINE

GARABATO, DANIEL

HATZIDIMITRIOU, DESPINA

KLIONER, SERGEI A.

RIMOLDINI, LORENZO G.

BELLAS-VELIDIS, IOANNIS

CARNERERO, MARIA ISABEL

DIENER, CATRINA

FOUESNEAU, MORGAN

GALLUCCIO, LAURENT

GAVRAS, PANAGIOTIS

KRONE-MARTINS, ALBERTO G.O.

RAITERI, CLAUDIA M.

TEIXEIRA, R. R.P.

BROWN, ANTHONY G.A.

VALLENARI, ANTONELLA