Entropy of the intracluster medium at high redshift

Abstract

Recent observations of entropy of intracluster medium (ICM) at high redshift are not consistent with a redshift independent entropy floor. In order to interpret these observations, we study models in which the entropy of ICM is enhanced at the epoch of cluster formation (z_f), which then passively evolves as a result of radiative cooling until the epoch of observation (z_o). We confirm that a z-independent entropy floor is incompatible with the observations. We find that models in which energy deposition into the ICM increases with redshift (scaling approximately as $\sim M_c{l}^0.6(1+z_f{)}^2.2$) are consistent with observations of low and high redshift clusters. Possible sources of such non-gravitational heating are briefly discussed.

Accepted in MNRAS, 6 pages, 5 figures

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Cited by in corpus (4)

• Limits on the AGN activities in X-ray underluminous galaxy groups
• An Evolving Entropy Floor in the Intracluster Gas?
• Intracluster gas pressure, entropy injection and redshift evolution
• Heating of the intracluster medium by buoyant bubbles and sound waves