Abstract Details
| Name: Sheelu Abraham Affiliation: IUCAA, Pune, India Conference ID: ASI2016_470 Title : Does the formation scenario of S0 galaxies depend on their stellar mass? Authors and Co-Authors : Sudhanshu Barway, South African Astronomical Observatory, Cape Town South Africa Yogesh Wadadekar, National Centre for Radio Astrophysics, Ganeshkhind, Pune, India Ajit K Kembhavi, IUCAA, Ganeshkhind, Pune, India Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : We present a study of the stellar mass dependence of the evolution of ~320 S0 galaxies in SDSS r band using bulge-disc-bar correlations. We extracted galaxy structural parameters for the bulge, disc and bar using GALFIT, a 2-D image decomposition code. We have multi-wavelength data on these S0 galaxies using which we measure total stellar mass, colours etc. We have created a catalogue of these parameters as well as those available from SDSS database along with structural parameters in r-band. We confirm earlier results from our research group and find that various scaling relations involving bulge and disc parameters show dependence on stellar mass. We can broadly divide S0 galaxies into two classes in which massive S0 galaxies form via fast processes like quenching of star formation through major mergers while less massive galaxies formed through a different mechanism involving slow secular evolution processes where star formation is still ongoing. The fraction of barred galaxies, which comprises 17% of our S0 galaxies, also shows mass dependence. i.e. less massive S0 galaxies are more likely to host bars than massive S0 galaxies. Stellar populations in these S0 galaxies reveal that massive galaxies are dominated by old stellar populations while less massive S0s showing recent star formation activity and may contain young stars with age ~10^8 yr. These results provide evidence that the formation history of S0 galaxies follows two very different routes and which depends primarily upon the mass of the galaxy, though the environment also plays a significant role. |