A Measurement of H0 from the Sunyaev-Zeldovich Effect

We present a determination of the Hubble constant, H0, from measurements of the Sunyaev-Zeldovich effect in an orientation-unbiased sample of seven z < 0.1 galaxy clusters. With improved X-ray models and a more accurate 32 GHz calibration, we obtain H0 = 64 ± 14sys km s-1 Mpc-1 for a standard cold dark matter (CDM) cosmology, or H0 = 66 ± 15sys km s-1 Mpc-1 for a flat ΛCDM cosmology. In combination with X-ray cluster measurements and the big bang nucleosynthesis value for ΩB, we find ΩM = 0.32 ± 0.05.