Abstract Details
| Name: Sonali Sachdeva Affiliation: University of Delhi Conference ID: ASI2015_586 Title : Evolution of bulges in disc galaxies Authors and Co-Authors : Dimitri Gadotti (ESO, Chile), Kanak Saha (IUCAA, India) Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : Establishing the relative role of internally and externally driven mechanisms responsible for bulge growth is essential to understand disc evolution. To achieve that, we have studied the evolution in the inner-region of disc galaxies without classical bulge in comparison to those with that for z<1. Using images from Hubble Space Telescope and Sloan Digital Sky Survey, we have computed both parametric and nonparametric measures and examined the evolution in size, inner concentration, stellar mass, stellar density inside effective radius and asymmetry. Both disc galaxies with and without classical bulge have gained more than 50% of their mass since z~0.9. The size evolution as well as the strengthening of the bulge component with time is more effective for the galaxies with classical bulge. However, the fall in asymmetry is more drastic for the bulgeless disc sample. Overall, we infer that the externally driven evolution in terms of accretion and minor-mergers is more dominant than secular evolution. Also, the local environment of the galaxy is seen to play a significant role in its structural evolution. |