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26 April 2024 |
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Article overview
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The Color Bimodality in Galaxy Clusters since z = 0.9 | | Y.-S. Loh
; E. Ellingson
; H.K.C. Yee
; D.G. Gilbank
; M.D. Gladders
; L.F. Barrientos
; | | Date: |
26 Feb 2008 | | Abstract: | We present the evolution of the color-magnitude distribution of galaxy
clusters from z = 0.45 to z = 0.9 using a homogeneously selected sample of
~1000 clusters drawn from the Red-Sequence Cluster Survey (RCS). The red
fraction of galaxies decreases as a function of increasing redshift for all
cluster-centric radii, consistent with the Butcher-Oemler effect, and
suggesting that the cluster blue population may be identified with newly
infalling galaxies. We also find that the red fraction at the core has a
shallower evolution compared with that at the cluster outskirts. Detailed
examination of the color distribution of blue galaxies suggests that they have
colors consistent with normal spirals and may redden slightly with time.
Galaxies of starburst spectral type contribute less than 5% of the increase in
the blue population at high redshift, implying that the observed Butcher-Oemler
effect is not caused by a unobscured starbursts, but is more consistent with a
normal coeval field population. | | Source: | arXiv, 0802.3726 | | Services: | Forum | Review | PDF | Favorites | |
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