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gaia data release 3 documentation

9 Surface brightness profiles of extragalactic sources

9.4 Surface brightness profile fitting

In order to extract the surface brightness profile from Gaia data, an automatic data reduction pipeline has been developed. It analyses the light profile of the sources through a nucleus/galaxy decomposition for the quasars, and a free Sérsic profile and a de Vaucouleurs profile for the galaxies. The fitting is based on a direct model that aims at reproducing at best the observed windows. The field names given thereafter correspond to parameters tabulated in the qso_candidates and galaxy_candidates tables.