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2004ApJ...617..829B - Astrophys. J., 617, 829-846 (2004/December-3)

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


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Cosmology: Cosmic Microwave Background - Cosmology: Observations - Galaxies: Clusters: General - Cosmology: Large-Scale Structure of Universe

Simbad objects: 14

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