SIMULATING $H_0$ DETERMINATIONS FROM GALAXY CLUSTERS
WILL GRAINGER
Astrophysics, Cavendish Laboratory, Madingley Road,
Cambridge CB3 0HE, England


Abstract:
Various simplifying assumptions are made in the determination of $H_0$ via the Sunyaev-Zel'dovich + X-ray methodology used to date. These are investigated by examining results from S-Z and X-ray simulations of intracluster gas. The most significant effect is found to be the breakdown of the assumption of isothermality. The differing dynamic states of the clusters in the sample is found, as expected, to increase the spread of best estimate; this is illustrated by S-Z, X-ray and 300 MHz radio observations of Abell 1914 which show it contains recently shocked gas.