Measurement of the Hubble Constant and Other Cosmological Constraints from X-ray and Sunyaev-Zel'dovich Effect Data of 37 Galaxy Clusters


Massimiliano Bonamente
Assistant Research Professor
Department of Physics
The University of Alabama in Huntsville

11 February 2005
Socialization : 10:15 a.m.
Presentation : 10:30 a.m.

I present a sample of 37 clusters of galaxies (0.14 ≤ z ≤ 0.89) for which Sunyaev-Zel'dovich Effect (SZE) data and Chandra X-ray imaging and spectroscopy are available. A Markov chain Monte Carlo technique is used to determine the spatial properties and surface brightness of the X-ray emitting gas, the X-ray temperature and abundance, and the SZE decrement for each cluster. From these observables, each cluster's total mass, gas mass fraction, and angular diameter distance are inferred. The sample properties are used to constrain the Hubble constant and the matter density of the universe. The measurement of H0 = 73 ± 4 km/s/Mpc (68% statistical error) is in agreement with other independent methods, and the matter density is constrained to Ωmatter∼ 0.3.


In 1996, Dr. Max Bonamente received a BS and MS in Electrical Engineering from the University of Perugia, Italy, and in the years 1999 and 2000, he earned a MS and PhD in Physics from the University of Alabama in Huntsville. From 2000 to 2001, Dr. Bonamente held a postdoctoral position at the Catania Observatory in Italy. Starting in 2001, he has been an Assistant Research Professor at the UAH as well as a Chandra scientist at the NSSTC.

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