``Sunyaev-Zeldovich Effect-Derived Distances to the High-Redshift Clusters MS 0451.6-0305 and CL 0016+16''
We determine the distances to the z~0.55 galaxy clusters
MS0451 and CL0016 from a maximum likelihood joint fit to
interferometric Sunyaev-Zel'dovich effect (SZE) and X-ray
observations. We model the intracluster medium (ICM) using a
spherical isothermal beta-model. We quantify the statistical and
systematic uncertainties inherent to these direct distance
measurements, and we determine constraints on the Hubble parameter for
three different cosmologies. For an OmegaM=0.3, OmegaL=0.7
cosmology, these distances imply a Hubble constant of
63(+12/-9),(+21/-21)km/s/Mpc, where the uncertainties
correspond to statistical followed by systematic at 68% confidence.
The best fit Ho is 57km/s/Mpc for an open OmegaM=0.3 universe and 52km/s/Mpc
for a flat OmegaM=1 universe.