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Title:
Entropy Profiles in the Cores of Cooling Flow Clusters of Galaxies
Authors:
Donahue, Megan; Horner, Donald J.; Cavagnolo, Kenneth W.; Voit, G. Mark
Affiliation:
AA(Department of Physics and Astronomy, Michigan State University, BPS Building, East Lansing, MI 48824; , , .), AB(NASA Goddard Space Flight Center, Code 660, Greenbelt, MD 20771; .), AC(Department of Physics and Astronomy, Michigan State University, BPS Building, East Lansing, MI 48824; , , .), AD(Department of Physics and Astronomy, Michigan State University, BPS Building, East Lansing, MI 48824; , , .)
Publication:
The Astrophysical Journal, Volume 643, Issue 2, pp. 730-750. (ApJ Homepage)
Publication Date:
06/2006
Origin:
UCP
ApJ Keywords:
Catalogs, Cosmology: Observations, Galaxies: Clusters: General, Methods: Data Analysis, X-Rays: Galaxies: Clusters
DOI:
10.1086/503270
Bibliographic Code:
2006ApJ...643..730D

Abstract

The X-ray properties of a relaxed cluster of galaxies are determined primarily by its gravitational potential well and the entropy distribution of its intracluster gas. That entropy distribution reflects both the accretion history of the cluster and the feedback processes that limit the condensation of intracluster gas. Here we present Chandra observations of the core entropy profiles of nine classic ``cooling flow'' clusters that appear relatively relaxed (at least outside the central 10-20 kpc) and contain intracluster gas with a cooling time less than a Hubble time. We show that those entropy profiles are remarkably similar, despite the fact that the clusters range over a factor of 3 in temperature. They typically have an entropy level of ~130 keV cm2 at 100 kpc that declines to a plateau ~10 keV cm2 at <~10 kpc. Between these radii, the entropy profiles are ~rα with α~1.0-1.3. The nonzero central entropy levels in these clusters correspond to a cooling time ~108 yr, suggesting that episodic heating on this timescale maintains the central entropy profile in a quasi-steady state. We show in an appendix that although disturbances and bubbles are visible in the central regions of these clusters, these phenomena do not strongly bias our entropy estimates.
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