61 ± 3 ± 18 km s-1 Mpc-1, where the
uncertainties are
statistical followed by systematic at 68% confidence. With a sample
of high-redshift galaxy clusters, SZE/X-ray distances can be used to
measure the geometry of the Universe.
"Measuring and Modeling the Universe", from the Carnegie
Observatories Centennial Symposia. Published by Cambridge University
Press, as part of the Carnegie Observatories Astrophysics Series. Edited
by W. L. Freedman, 2004, p. 138.
For a PDF version of the article, click
here.
Abstract. Combined with X-ray imaging and spectral data,
observations of the
Sunyaev-Zel'dovich effect (SZE) can be used to determine direct distances to
galaxy clusters. These distances are independent of the extragalactic
distance ladder and do not rely on clusters being standard candles or
rulers. Observations of the SZE have progressed from upper limits to
high signal-to-noise ratio detections and imaging of the SZE. SZE/X-ray
determined distances to galaxy clusters are beginning to trace out the
theoretical angular-diameter distance relation. The current ensemble
of 41 SZE/X-ray distances to galaxy clusters imply a Hubble constant
of H0
61 ± 3 ± 18 km s-1 Mpc-1, where the
uncertainties are
statistical followed by systematic at 68% confidence. With a sample
of high-redshift galaxy clusters, SZE/X-ray distances can be used to
measure the geometry of the Universe.
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