Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281..327v&link_type=abstract
The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb
Physics
Scientific paper
The intergalactic medium within groups and clusters of galaxies contains valuable information about the cooling and feedback processes associated with galaxy formation. Both of these processes directly affect the entropy distribution of intergalactic gas, thereby altering how the X-ray luminosity and temperature of a cluster or group depend on halo mass. The end result of both cooling and feedback is to raise the mean entropy of the uncondensed intergalactic gas. Because feedback is triggered by cooling and acts until cooling ceases, both cooling-dominated models and feedback-dominated models produce similar levels of excess entropy. We have shown that both types of models very successfully reproduce the X-ray properties of clusters, as long as feedback is regulated by cooling. Thus, it can be difficult to distinguish between these processes on the basis of excess entropy alone. Instead, we need a careful baryon census in groups, where cooling and feedback affect the X-ray properties most dramatically, in order to determine the effectiveness of feedback in preventing condensation of intergalactic gas into stars and cold gas clouds.
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