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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. ORCID: https://orcid.org/0000-0002-5127-0401, 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: 21 Oct 2022 11:01
URI: https://orca.cardiff.ac.uk/id/eprint/42114

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