Physically Motivated Models of Galaxy Clusters Based on a Generalized NFW Profile and an Application to Chandra Observations

Details Physically Motivated Models of Galaxy Clusters Based on a Generalized NFW Profile and an Application to Chandra Observations Physically Motivated Models of Galaxy Clusters Based on a Generalized NFW Profile and an Application to Chandra Observations

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..75b&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

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Clusters Of Galaxies

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Precise measurements of galaxy cluster masses are crucial for providing a foundation to investigate theoretically predicted physical processes which should be occurring in the intra-cluster medium(ICM), such as the helium sedimentation. We present physically motivated temperature and density models of galaxy clusters based on a generalized NFW dark matter and a polytropic equation of state density profile in order to profile the masses of galaxy clusters. Our temperature and density models have been derived analytically, and contain only 6 free parameters, resulting in less degeneracy when compared to other models of ICM properties. We present a comparison of these models with the Chandra spectral and imaging data of three clusters Abell 1835, Abell 2204 and CL J1226.9+3332 and show that our new, analytic models are in good agreement with the data and previous work in the area. This work is the first step towards the analysis of a large sample in which we will test Peng & Nagai (2009) helium sedimentation processes.

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