Cortesi, Arianna
Brazil IF(UFRJ)
Recovering the origin of lenticular galaxies by studying their multi-wavelengths Sersic index profiles, for different bins of mass and star formation
Lenticular galaxies account for more than 50% of massive galaxies in the local Universe; yet their formation mechanisms are still unclear, specifically which is the role of the galaxy mass and the surrounding environment in the formation of lenticular galaxies and if some low mass S0s could be primordial objects. Recent (and not so recent) works have pointed out that S0 galaxies could be a group of very different objects, sharing a similar isophotal profile. Indeed, a clear definition of the properties of lenticular galaxies is still missing in the astronomical community. In this work we make use of SPLUS multi-wavelengths data to define the main photometric parameters characterizing S0 galaxies, using GALFITM to fit the 5 broad and 7 narrow bands. Moreover, performing a SED fitting using Lephare, we can obtain galaxy masses and specific star formation rate (sSFR). We study the relation between Sersic index, bulge-over-total (B/T) light ratio, colour, masses and star formation rate for a sample of ~400 lenticular galaxies in the Stripe 82. Among others, we find a correlation between B/T and the sSFR, which suggests a correlation between bulge growth and star formation quenching. We aim at connecting this findings with environmental measures, obtained using S-PLUS photometric redshifts and/or available in the literature.