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

Дата и время публикации : 2008-09-29T21:26:04Z

Авторы публикации и институты :
T. Mroczkowski
M. Bonamente
J. E. Carlstrom
T. L. Culverhouse
C. Greer
D. Hawkins
R. Hennessy
M. Joy
J. W. Lamb
E. M. Leitch
M. Loh
B. Maughan
D. P. Marrone
A. Miller
D. Nagai
S. Muchovej
C. Pryke
M. Sharp
D. Woody

Ссылка на журнал-издание: Astrophys.J.694:1034-1044,2009
Коментарии к cтатье: 28 pages, 6 figures, accepted by ApJ for publication (probably April 2009)
Первичная категория: astro-ph

Все категории : astro-ph

Краткий обзор статьи: 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 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.

Category: Physics