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Measurements of Sunyaev-Zel'dovich effect scaling relations for clusters of galaxies

Benson, B. A., Church, S. E., Ade, Peter A. R., Bock, J. J., Ganga, K. M., Henson, C. N. and Thompson, K. L. 2004. Measurements of Sunyaev-Zel'dovich effect scaling relations for clusters of galaxies. Astrophysical Journal 617 (2) , pp. 829-846. 10.1086/425677

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Abstract

We present new measurements of the Sunyaev-Zel'dovich (SZ) effect from clusters of galaxies using the second-generation Sunyaev-Zel'dovich Infrared Experiment (SuZIE II). We combine these new measurements with previous cluster observations with the SuZIE instrument to form a sample of 15 clusters of galaxies. For this sample we calculate the central Comptonization y0 and the integrated SZ flux decrement S for each of our clusters. We find that the integrated SZ flux is a more robust observable derived from our measurements than the central Comptonization because of inadequacies in the spatial modeling of the intracluster gas with a standard β-model. This is highlighted by comparing our central Comptonization results with values calculated from measurements using the BIMA and OVRO interferometers. On average, the SuZIE-calculated central Comptonizations are ~60% higher in the cooling flow clusters than the interferometric values, compared to only ~12% higher in the non-cooling flow clusters. We believe this discrepancy to be in large part due to the spatial modeling of the intracluster gas. From our cluster sample we construct y0-T and S-T scaling relations. The y0-T scaling relation is inconsistent with what we would expect for self-similar clusters; however, this result is questionable because of the large systematic uncertainty in y0. The S-T scaling relation has a slope and redshift evolution consistent with what we expect for self-similar clusters, with a characteristic density that scales with the mean density of the universe. We rule out zero-redshift evolution of the S-T relation at ~90% confidence.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: cosmic microwave background; cosmology: observations; galaxies: clusters: general; large-scale structure of universe
Publisher: IOP Science
ISSN: 0004-637X
Last Modified: 04 Jun 2017 04:38
URI: http://orca.cf.ac.uk/id/eprint/42114

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