Triple Experiment Spectrum of the Sunyaev-Zeldovich Effect in the Coma Cluster: H_0

Abstract

The Sunyaev-Zeldovich (SZ) effect was previously measured in the Coma cluster by the Owens Valley Radio Observatory and Millimeter and IR Testa Grigia Observatory experiments and recently also with the Wilkinson Microwave Anisotropy Probe satellite. We assess the consistency of these results and their implications on the feasibility of high-frequency SZ work with ground-based telescopes. The unique data set from the combined measurements at six frequency bands is jointly analyzed, resulting in a best-fit value for the Thomson optical depth at the cluster center, tau_{0}=(5.35 \pm 0.67) 10^{-3}. The combined X-ray and SZ determined properties of the gas are used to determine the Hubble constant. For isothermal gas with a βdensity profile we derive H_0 = 84 \pm 26 km/(s\cdot Mpc); the (1σ) error includes only observational SZ and X-ray uncertainties.

arXiv comment11 pages, 1 figure

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