GALAXY CLUSTER BARYON FRACTIONS REVISITED

GALAXY CLUSTER BARYON FRACTIONS REVISITED

We measure the baryons contained in both the stellar and hot-gas components for 12 galaxy clusters and groups at z ~ 0.1 with M = 1-5 x 10 super(14) M sub([middot in circle]). We recover a mean relation for the stellar mass versus halo mass, M sub([sstarf]) [is proportional to] M super(-0.52+ or -0....

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Bibliographic Details
Published in:The Astrophysical journal 2013-11, Vol.778 (1), p.1-16
Main Authors: Gonzalez, Anthony H, Sivanandam, Suresh, Zabludoff, Ann I, Zaritsky, Dennis
Format: Article
Language:eng
Subjects:
ABUNDANCE
ANISOTROPY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
AUGMENTATION
BARYONS
DISTRIBUTION
EFFICIENCY
EVOLUTION
Galactic clusters
GALAXY CLUSTERS
Halos
MASS
MICROWAVE RADIATION
Occupation
OCCUPATIONS
Partitioning
Star formation
STARS
Stellar mass
X RADIATION
X-RAY GALAXIES
X-rays
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Summary:We measure the baryons contained in both the stellar and hot-gas components for 12 galaxy clusters and groups at z ~ 0.1 with M = 1-5 x 10 super(14) M sub([middot in circle]). We recover a mean relation for the stellar mass versus halo mass, M sub([sstarf]) [is proportional to] M super(-0.52+ or -0.04) sub(500), that is 1[sigma] shallower than in our previous result. We confirm that the partitioning of baryons between the stellar and hot-gas components is a strong function of M sub(500); the fractions of total mass in stars and X-ray gas within a sphere of radius r sub(500) scale as f sub([sstarf]) [is proportional to] M-0.45+ or -0.04 and f sub(gas) [is proportional to] M super(0.26+ or -0.03) sub(500), respectively. Our derived stellar baryon fractions are also higher, and the trend with halo mass weaker, than those derived from recent halo occupation distribution and abundance matching analyses. The ratio of the stellar-to-gas mass within r sub(500) (M sub([sstarf])/M sub(gas)), a measure of integrated star-formation efficiency, strongly decreases with increasing M sub(500).
ISSN:0004-637X
1538-4357