Details

Autor(en) / Beteiligte

• Mroczkowski, Tony
• Bonamente, Max
• Carlstrom, John E
• Culverhouse, Thomas L
• Greer, Christopher
• Hawkins, David
• Hennessy, Ryan
• Joy, Marshall
• Lamb, James W
• Leitch, Erik M
• Loh, Michael
• Maughan, Ben
• Marrone, Daniel P
• Miller, Amber
• Muchovej, Stephen
• Nagai, Daisuke
• Pryke, Clem
• Sharp, Matthew
• Woody, David

Titel

Application of a Self-Similar Pressure Profile to Sunyaev-Zel'Dovich Effect Data from Galaxy Clusters

Ist Teil von

• The Astrophysical journal, 2009-04, Vol.694 (2), p.1034-1044

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2009

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek

Beschreibungen/Notizen

• 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.