期刊
ASTROPHYSICAL JOURNAL
卷 694, 期 2, 页码 1034-1044出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/694/2/1034
关键词
cosmology: observations; galaxies: clusters: individual (Abell 1835, Abell 1914, CL J1226.9+3332); X-rays: galaxies: clusters
资金
- James S. McDonnell Foundation
- National Science Foundation [AST-0604982, PHY-0114422, AST-0507545, AST-05-07161]
- University of Chicago
- Sloan Fellowship
- NRAO Jansky Fellowship
- Chandra Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0802363] Funding Source: National Science Foundation
We investigate the utility of a new, self-similar pressure profile for fitting Sunyaev-Zel'dovich (SZ) effect observations of galaxy clusters. Current SZ imaging instruments-such as the Sunyaev-Zel'dovich Array (SZA)-are capable of probing clusters over a large range in a physical scale. A model is therefore required that can accurately describe a cluster's pressure profile over a broad range of radii from the core of the cluster out to a significant fraction of the virial radius. In the analysis presented here, we fit a radial pressure profile derived from simulations and detailed X-ray analysis of relaxed clusters to SZA observations of three clusters with exceptionally high-quality X-ray data: A1835, A1914, and CL J1226.9+3332. From the joint analysis of the SZ and X-ray data, we derive physical properties such as gas mass, total mass, gas fraction and the intrinsic, integrated Compton y-parameter. We find that parameters derived from the joint fit to the SZ and X-ray data agree well with a detailed, independent X-ray-only analysis of the same clusters. In particular, we find that, when combined with X-ray imaging data, this new pressure profile yields an independent electron radial temperature profile that is in good agreement with spectroscopic X-ray measurements.
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