Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chfe.sympe..10r&link_type=abstract
Chandra Fellows Symposium 2001, held 15 October, 2001 at Harvard-Smithsonian Center for Astrophysics, meeting abstract.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Analysis of Sunyaev-Zel'dovich effect (SZE) and X-ray data from a galaxy cluster provides enough information to determine the distance to the cluster. We determine distances to a sample of 18 galaxy clusters from a maximum likelihood joint analysis of our own 30 GHz interferometric SZE observations and publicly available X-ray data. We quantify the statistical and systematic uncertainties inherent to these direct distance measurements, and we determine constraints on the Hubble parameter for various cosmologies. These distances imply a Hubble constant of 60 +4/-4 +14/-19 km s-1 Mpc-1 for the currently favored OmegaM = 0.3, OmegaLambda = 0.7 cosmology, where the uncertainties correspond to statistical followed by systematic at 68% confidence. With a sample of 18 clusters, systematic uncertainties clearly dominate. The systematics are observationally approachable and will be addressed in the coming years through the current generation of X-ray satellites (Chandra & XMM-Newton) and available radio observatories (OVRO, BIMA, & VLA). Analysis of high redshift clusters detected in future SZE and X-ray surveys will allow a determination of the geometry of the universe from SZE determined distances, providing a distance ladder independent check on recent constraints on the cosmology of the universe.
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