Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.6907s&link_type=abstract
American Astronomical Society Meeting 205, #69.07; Bulletin of the American Astronomical Society, Vol. 36, p.1460
Astronomy and Astrophysics
Astronomy
Scientific paper
One powerful way to determine the distance to galaxy clusters is the combination of the Sunyaev-Zel'dovich Effect (SZE) with thermal bremsstrahlung from hot gas in the intracluster medium. This technique allows a measurement independent of the cosmic distance ladder. We will present an analysis of two low redshift (z < 0.1) galaxy clusters, A3266 and A3558, using the above method. By combining SZE observations from the Cosmic Background Imager (CBI) with results of previously-published X-ray data, we fit models of cluster gas structure to the data using both a maximum likelihood method and a Markov Chain Monte Carlo (MCMC) algorithm. The best-fit models yield a measurement of distance to the galaxy clusters, and a value for H0 can be calculated from the best-fit distances and published redshift data. We obtained a result of H0 = 65±14 km s-1 Mpc-1 as an average of the H0 values for each cluster, which is consistent with the value of 72±5 km s-1 Mpc-1 measured by WMAP. We will discuss the application of the MCMC algorithm to SZE and X-ray data as well as display the results of our own analysis using this technique. This work was supported by a NSF-REU site grant to Associated Universities, Inc./National Radio Astronomy Observatories.
Myers Steven T.
Stilp Adrienne M.
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