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26 April 2024 |
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The Stellar Mass Growth of Brightest Cluster Galaxies in the IRAC Shallow Cluster Survey | | Yen-Ting Lin
; Mark Brodwin
; Anthony H. Gonzalez
; Paul Bode
; Peter R. M. Eisenhardt
; S. A. Stanford
; Alexey Vikhlinin
; | | Date: |
22 May 2013 | | Abstract: | The details of the stellar mass assembly of brightest cluster galaxies (BCGs)
remain an unresolved problem in galaxy formation. We have developed a novel
approach that allows us to construct a sample of clusters that form an
evolutionary sequence, and have applied it to the Spitzer IRAC Shallow Cluster
Survey (ISCS) to examine the evolution of BCGs in progenitors of present-day
clusters with mass of (2.5-4.5)x10^{14}Msun. We follow the cluster mass growth
history extracted from a high resolution cosmological simulation, and then use
an empirical method that infers the cluster mass based on the ranking of
cluster luminosity to select high-z clusters of appropriate mass from ISCS to
be progenitors of the given set of z=0 clusters. We find that, between z=1.5
and 0.5, the BCGs have grown in stellar mass by a factor of 2.3, which is
well-matched by the predictions from a state-of-the-art semi-analytic model.
Below z=0.5 we see hints of differences in behavior between the model and
observation. | | Source: | arXiv, 1305.5254 | | Services: | Forum | Review | PDF | Favorites | |
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