Measurements of the Sunyaev-Zeldovich Effect in the Nearby Clusters A478, A2142, and A2256

摘要

An X-ray flux-limited sample of nearby clusters of galaxies has been defined for observations of the Sunyaev-Zeldovich effect (SZE) to be carried out on the Owens Valley 5.5 m telescope at 32 GHz. The X-ray sample selection minimizes the systematic errors introduced by cluster elongation in the determination of H_0. Owing to their proximity, these clusters are well studied in the X-ray wave bands. The measurement of the SZE in three of these clusters is reported in this paper: △T = -375 + - 28 μK (A478), -437 + - 25 μK (A2142), and -243 + - 29 μK (A2256). These values have been corrected for radio source contamination, but have not been corrected for the beam dilution and switching (which are model dependent).