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Deficit of Luminous and Normal Red Galaxies in Cosmic Voids | | Sean Bruton
; Xinyu Dai
; Eduardo Guerras
; Ferah A. Munshi
; | | Date: |
10 Oct 2019 | | Abstract: | We construct a sample of 10,680 wall galaxies and 3,064 void galaxies with
$M_R lesssim -20$ by cross referencing a void catalog from literature with
Baryon Oscillation Spectroscopic Survey (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 the number ratio of red-to-blue
galaxies increases with distances from the void centers, suggesting a deficit
of luminous and normal red galaxies in voids. We find a mean (g -- r) magnitude
color of 1.298 and 1.210 for the wall and void galaxies, respectively, when
considering the combined red and blue sample, which is found to be a
significant difference. However, when considering the blue and red samples
separately, we find no significant color difference. We conclude that the
constituents galaxies of each population, rather than intrinsic color
difference, is the main driver in the apparent average color difference of
galaxies in voids and walls, indicating a deficit of luminous and normal red
galaxies in voids. Our analysis suggests that the primary
environmental-dependence effect on galaxy evolution for normal and luminous
galaxies between void and wall regions is manifested in the number of red
galaxies, which depends on the environmental-dependent merger history. Using a
semi-analytic simulation model, we can successfully reproduce the apparent
color difference between the void and wall galaxies. | | Source: | arXiv, 1910.4750 | | Services: | Forum | Review | PDF | Favorites | |
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