Deficit of Red Galaxies in Cosmic Voids
Abstract
Cosmic voids probe galaxy formation and evolution in lowest densities in the universe. We construct a catalog of void galaxies by cross referencing a void catalog with BOSS CMASS and WiggleZ galaxies, where the CMASS survey targets redder galaxies and the WiggleZ survey targets bluer galaxies. Comparing the density profiles of the red and blue galaxies as a function of the void radius, we find that there is a deficit of red galaxies in voids -- the ratio of red to blue galaxies increases with distances from the void centers either in physical or effective void radius units. Using a T-test and Kolmogorov-Smirnov test, we further confirm that the average color of galaxies between wall and void galaxies are significantly different. We find that pure density evolution rather than color evolution is the main driver for the deficit of red galaxies in voids.
- Publication:
-
American Astronomical Society Meeting Abstracts #231
- Pub Date:
- January 2018
- Bibcode:
- 2018AAS...23144102B