Friday, November 4, 2011

1109.5067 (Laurence P. David et al.)

The Universal Gas Mass Fraction in Clusters of Galaxies    [PDF]

Laurence P. David, Christine Jones, William Forman
We obtained a deep 150 ksec Chandra observation of the optically selected cluster of galaxies, RCS 2318+0034, to investigate the gas mass fraction in this system. Combining our deep Chandra observation with an archival 50 ksec observation, we derive gas mass fractions of fgas=0.061 and 0.13 within r2500 and r500, respectively. The gas mass fraction in RCS 2318+0034 within r500 is typical of X-ray selected clusters. Further study shows that the large scale properties of RCS 2318+0034, including the relations between gas mass, X-ray luminosity and gas temperature are also consistent with the observed correlations of X-ray selected clusters. However, the gas mass fraction within r2500 is less than most X-ray selected clusters, as previously reported. The deep {\it Chandra} image of RCS 2318+0034 shows that this system is presently undergoing a major merger which may have an impact on the inferred gas mass fraction within r2500.
View original: http://arxiv.org/abs/1109.5067

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