شماره ركورد كنفرانس :
4378
عنوان مقاله :
On the Evolution of the Stellar Mass Profile of Galaxies and its Environmental Dependence
پديدآورندگان :
Mosleh Moein Biruni Observatory, Shiraz University, Shiraz 71454, Iran; Department of Physics, Shiraz University, Shiraz 71454, Iran
عنوان كنفرانس :
بيست و يكمين همايش ملي پژوهشي نجوم ايران
چكيده فارسي :
We use multi-wavelength imaging data from the Hubble Space Telescope (HST) and the Sloan Digital Sky Survey (SDSS) to study the evolution of the stellar mass profiles of galaxies with M* 10^ {10} M_sun. We show that at fixed stellar mass, the half-mass sizes of quiescent galaxies increase from z ~ 2 to z ~ 0 by a factor of ~3-5, whereas the half-mass sizes of star-forming galaxies increase only slightly, by a factor of ∼2. The central densities of quiescent galaxies decline slightly (by a factor of ~ 1.7) from z ~ 2 to z ~ 0, while for star-forming galaxies the central densities increase with time, at fixed mass. We show that the central density of galaxies has a tighter correlation with specific star-formation rate (sSFR) than the surface density at effective radii. We also show that for all masses and redshifts, galaxies with higher central density are more prone to be quenched. In addition, the role of environment in shaping the stellar mass profiles of the quiescent galaxies in the local Universe is studied. We find that quiescent galaxies in the isolated regions have similar central properties (such as the central density and central velocity dispersion) to their counterparts in groups and clusters. However, the isolated quiescent galaxies have at most 25% smaller sizes than the quiescent ones in clusters.