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Title: Entropy of the intracluster medium at high redshift
Authors: Nath, Biman B.
Keywords: galaxies: clusters: general
intergalactic medium
cosmology: theory
X-rays: galaxies: clusters
Issue Date: Sep-2004
Publisher: Blackwell Publishing for the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2004, Vol.353, Issue 3, p941-946.
Abstract: Recent observations of the entropy of the intracluster medium (ICM) at high redshift are not consistent with a redshift-independent entropy floor. To interpret these observations, we study models in which the entropy of ICM is enhanced at the epoch of cluster formation (zf), which then passively evolves as a result of radiative cooling until the epoch of observation (zo). 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 ~M0.6cl(1 +zf)2.2] are consistent with observations of low- and high-redshift clusters. Possible sources of such non-gravitational heating are briefly discussed.
Description: Restricted Access. An open access version is available at
ISSN: 0035-8711
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Copyright: (2004) Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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