1202.0494 (Niraj Welikala et al.)

Color Gradients in Galaxies Out to z~3: Dependence on Galaxy Properties    [PDF]

Niraj Welikala, Jean-Paul Kneib

Using HST/ACS observations, we measure the color gradients of 3248 galaxies in the GOODS-South field out to z~3 and i_{AB}<25.5 and characterize their dependence on galaxy properties (luminosity, apparent magnitude, galaxy size, redshift and morphological type). The color gradient is measured by the difference of v-i color outside (R_{50}1, galaxies show increasingly bluer cores while the color of the outskirts does not change as rapidly. At z~2.5 and -22.0=2 is concentrated in their central regions. These color gradients and their dependence on galaxy properties could also have a significant impact on shear measurements in upcoming weak lensing cosmological surveys.

View original: http://arxiv.org/abs/1202.0494