Galaxy Clusters at the Edge: Temperature and Entropy Structure in Simulations and an Observed Cluster Out to the Virial Radius

Details Galaxy Clusters at the Edge: Temperature and Entropy Structure in Simulations and an Observed Cluster Out to the Virial Radius Galaxy Clusters at the Edge: Temperature and Entropy Structure in Simulations and an Observed Cluster Out to the Virial Radius

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536402b&link_type=abstract

American Astronomical Society, AAS Meeting #215, #364.02; Bulletin of the American Astronomical Society, Vol. 42, p.552

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Recently, Suzaku X-ray observations of the outer regions of the bright galaxy cluster PKS 0745-191 were reported by George et al. (2009, MNRAS, 395, 657). For the first time, accurate temperature and entropy profiles, along with profiles of gas density, gas fraction, and mass, were measured for a galaxy cluster out to 1.5r200 where r200 is the radius at which the cluster is 200 times the critical density (approximately the virial radius). We compared these observations with results from N-body + adaptive mesh refinement hydro cosmological simulations using Enzo with adiabatic gas physics. There is excellent agreement in the temperature and density profiles between an average of the twenty most massive clusters in the simulated volume and the PKS 0745-191 cluster. This supports our previous contention that clusters have "universal” outer temperature profiles. Furthermore, it appears that the simplest gas physics is adequate to model these clusters with more exotic mechanisms (e.g., heating by a distributed population of AGNs) being unnecessary.

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