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.