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Date and Time of the Query: 2019-04-19 T13:59:51 PDT
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For refcode 2004ApJ...617..829B:
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Copyright by American Astronomical Society. Reproduced by permission
2004ApJ...617..829B Measurements of Sunyaev-Zel'dovich Effect Scaling Relations for Clusters of Galaxies B. A. Benson, S. E. Church, P. A. R. Ade, J. J. Bock, K. M. Ganga, C. N. Henson, and K. L. Thompson 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 y_0_ 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 {beta}-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 y_0_-T and S-T scaling relations. The y_0_-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 y_0_. 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. Keywords: Cosmology: Cosmic Microwave Background, Cosmology: Observations, Galaxies: Clusters: General, Cosmology: Large-Scale Structure of Universe
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