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Entropy of the intracluster medium at high redshift | | Biman B. Nath
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21 Jun 2004 | | Subject: | astro-ph | | Affiliation: | Raman Research Institute, India | | 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 $sim M_cl^0.6 (1+z_f)^2.2$) are consistent with observations of low and high redshift clusters. Possible sources of such non-gravitational heating are briefly discussed. | | Source: | arXiv, astro-ph/0406451 | | Services: | Forum | Review | PDF | Favorites | |
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