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26 April 2024 |
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Groups of two galaxies in SDSS: implications of colours on star formation quenching time-scales | | Christopher Q. Trinh
; Elizabeth J. Barton
; James S. Bullock
; Andrew R. Zentner
; Risa H. Wechsler
; | | Date: |
24 Jan 2013 | | Abstract: | (Abrigded) Using hybrid N-body/semi-analytic substructure simulations, we
have devised a method to select galaxies that are isolated in their dark matter
halo (N=1 systems) and galaxies that reside in a group of exactly two (N=2
systems). Our N=2 systems are widely-separated with comoving projected
separations up to ~200 h^-1 kpc, where close galaxy-galaxy interactions are not
the dominant physical process at work. We apply our selection criteria to two
volume-limited sample of galaxies from the NYU VAGC based on SDSS DR6 with
M_r-5log_10 h < -19 and -20. The effects of a simple change in environment on
star formation properties are isolated by correcting the populations for
contamination by systems in richer environments and by eliminating differences
in stellar mass. For satellite galaxies in groups of two, we find a red excess
of 0.15 +/- 0.01 and 0.14 +/- 0.01 for the -19 and -20 samples, respectively,
relative to isolated galaxies of like stellar mass. A simple galaxy formation
model that assumes (1) N=1 galaxies are the progenitors of N=2 galaxies in a
statistical sense and (2) cold gas is instantaneously and completely removed
from an infalling satellite galaxy immediately upon accretion into another halo
predicts a red excess of 0.62 +/- 0.01 and 0.54 +/- 0.01 for the -19 and -20
samples, respectively. Thus, an immediate-rapid star formation quenching
scenario is inconsistent with these observations. A delayed-then-rapid star
formation quenching scenario with a delay time of 3.3 and 3.7 Gyr for the -19
and -20 samples, respectively, yields a red excess prediction that agrees with
the observations. | | Source: | arXiv, 1301.5870 | | Services: | Forum | Review | PDF | Favorites | |
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