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Comparison of pressure profiles of massive relaxed galaxy clusters using the Sunyaev–Zel’dovich and x-ray data

Bonamente, Massimiliano and Hasler, Nicole and Bulbul, Esra and Carlstrom, John E. and Culverhouse, Thomas L. and Gralla, Megan and Greer, Christopher and Hawkins, David and Hennessy, Ryan and Joy, Marshall and Kolodziejczak, Jeffrey and Lamb, James W. and Landry, David and Leitch, Erik M. and Marrone, Daniel P. and Miller, Amber and Mroczkowski, Tony and Muchovej, Stephen and Plagge, Thomas and Sharp, Matthew and Pryke, Clem and Woody, David (2012) Comparison of pressure profiles of massive relaxed galaxy clusters using the Sunyaev–Zel’dovich and x-ray data. New Journal of Physics, 14 . Art. No. 025010. ISSN 1367-2630.

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We present the Sunyaev–Zel'dovich (SZ) effect observations of a sample of 25 massive relaxed galaxy clusters observed with the Sunyaev–Zel'dovich array (SZA), an eight-element interferometer that is part of the Combined Array for Research in Millimeter-wave Astronomy (CARMA). We performed an analysis of new SZA data and archival Chandra observations of this sample to investigate the integrated pressure—a proxy for cluster mass—determined from x-ray and SZ observations, two independent probes of the intra-cluster medium (ICM). This analysis makes use of a model for the ICM introduced by Bulbul (2010 Astrophys. J. 720 1038) which can be applied simultaneously to the SZ and x-ray data. With this model, we estimated the pressure profile for each cluster using a joint analysis of the SZ and x-ray data, and using the SZ data alone. We found that the integrated pressures measured from the x-ray and SZ data are consistent. This conclusion is in agreement with recent results obtained using WMAP and Planck data, confirming that SZ and x-ray observations of massive clusters detect the same amount of thermal pressure from the ICM. To test for possible biases introduced by our choice of model, we also fitted the SZ data using the universal pressure profile proposed by Arnaud (2010 Astron. Astrophys. 517 A92) and found consistency between the two models out to r_(500) in the pressure profiles and integrated pressures.

Item Type:Article
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URLURL TypeDescription
Carlstrom, John E.0000-0002-2044-7665
Greer, Christopher0000-0002-9590-0508
Marrone, Daniel P.0000-0002-2367-1080
Mroczkowski, Tony0000-0003-3816-5372
Additional Information:© 2012 Institute of Physics Publishing Ltd and Deutsche Physikalische Gesellschaft. Received 4 July 2011 Published 29 February 2012. The operation of the SZA is supported by the NSF through grants AST-0604982 and AST- 0838187. Partial support was also provided by grant PHY-0114422 of the University of Chicago and by NSF grants AST-0507545 and AST-05-07161 to Columbia University. The CARMA operations are supported by the NSF under a cooperative agreement and by the CARMA partner universities. Support for TM was provided by the NASA through Einstein Postdoctoral Fellowship grant number PF0-110077 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060.
Funding AgencyGrant Number
University of ChicagoPHY-0114422
NSF Cooperative AgreementUNSPECIFIED
CARMA Partner UniversitiesUNSPECIFIED
NASA Einstein Postdoctoral FellowshipPF0-110077
NASA Chandra X-ray CenterNAS8-03060
Classification Code:PACS: 98.65.Cw; 95.85.Nv; 98.70.Dk; 98.70.Vc
Record Number:CaltechAUTHORS:20120501-092742062
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Official Citation: Comparison of pressure profiles of massive relaxed galaxy clusters using the Sunyaev–Zel'dovich and x-ray data Massimiliano Bonamente et al 2012 New J. Phys. 14 025010
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ID Code:31247
Deposited By: Ruth Sustaita
Deposited On:01 May 2012 16:58
Last Modified:09 Mar 2020 13:19

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