AAS 205th Meeting, 9-13 January 2005
Session 147 Groups and Clusters of Galaxies
Poster, Thursday, January 13, 2005, 9:20am-4:00pm, Exhibit Hall

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[147.15] Entropy Distributions in the Cores of Nearby X-ray Luminous Clusters of Galaxies

K. W. Cavagnolo, M. E. Donahue, G. M. Voit (Michigan State University), D. J. Horner (Goddard Space Flight Center), A. E. Evrard (University of Michigan)

We present entropy distributions for 11 bright galaxy clusters from the Chandra public archives. For each cluster, we fit projected one and two temperature mekal models using XSPEC to annular regions of 20,000 counts each. We also derived one- and two-temperature deprojected profiles in order to estimate radial entropy profiles. We present temperature and entropy maps for these clusters. We discuss how well such maps may represent the “true” projected quantities by comparing theoretical models from the Virtual Cluster Exploratorium with maps derived in similar ways to our data. By studying the entropy distribution within clusters we quantify the effect of radiative cooling, supernovae feedback, and AGN feedback on cluster properties. We also discuss systematic uncertainties arising from assumptions made about geometric symmetry in deprojection models and the practice of fixing the absorption column density to the Galactic value and other systematics arising from treatment of the data.

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© 2004. The American Astronomical Society.