AAS 197, January 2001
Session 107. Galaxy Clusters and Large Scale Structure II
Display, Thursday, January 11, 2001, 9:30-4:00pm, Exhibit Hall

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[107.13] A Comparison of Chandra Observations of Clusters of Galaxies with Dark Matter Models

B. E. Robertson (U. Washington), L. P. David (SAO)

We present Chandra X-ray Observatory data for several clusters of galaxies over a range of temperatures and redshifts. X-ray surface brightness profiles are produced for each cluster. Mass profiles are calculated for the inner 300 kpc of each cluster and compared with cold dark matter profiles from the literature. We find that the profile presented in Moore \emph{et. al.} (1999) produces a reasonable fit to the cluster mass distributions while maintaining best fit parameters consistent with cosmological and structure formation constraints (e.g., the epoch of cluster formation). The Navarro, Frenk, and White (1996) profile is found to reproduce the behavior of observed cluster mass distributions but fails to maintain best fit parameters consistent with cosmological constraints. When normalized to the dark matter profile virial mass equivalent M200, the measured mass distributions are found to be self-similar. Each cluster is also compared with the King approximation to an isothermal sphere, and all are found to be highly inconsistent with a flat density core.


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