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http://hdl.handle.net/2289/1514
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 arXiv.org |
URI: | http://hdl.handle.net/2289/1514 |
ISSN: | 0035-8711 |
Alternative Location: | http://arxiv.org/abs/astro-ph/0406451 http://dx.doi.org/10.1111/j.1365-2966.2004.08124.x |
Copyright: | (2004) Royal Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2004 MNRAS 353 p941.pdf Restricted Access | Restricted Access | 177.89 kB | Adobe PDF | View/Open Request a copy |
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