Chandra and SZA Observations of Clusters of Galaxies at z>1

Details Chandra and SZA Observations of Clusters of Galaxies at z>1 Chandra and SZA Observations of Clusters of Galaxies at z>1

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..25c&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Mathematics

Logic

Galaxy Clusters - Cosmology

Scientific paper

I will present Chandra X-ray and Sunyaev-Zeldovich Array (SZA) observations of a sample of galaxy clusters at high redshift (z>1). This regime remains relatively unexplored and yet holds the potential to tightly constrain cosmological models, provided the properties of the cluster population can be well calibrated. X-ray and Sunyaev-Zeldovich effect (SZE) measurements offer powerful and complementary probes of the hot gas in galaxy clusters; X-ray observations with Chandra allow detailed imaging and spectroscopy, while the SZE enables study of the gas out to larger radii on account of the weaker dependence of signal on gas density. Given the redshift independence of the SZE signal, the SZE is ideal for observing distant clusters. Using data from the SZA, a radio interferometer designed to image the SZE in galaxy clusters, constraints will be presented on the integrated Compton-y parameter, a measure of the total thermal energy in clusters. These new SZA measurements have produced high significance images of the SZE in several z>1 systems, including a cluster at z=1.39, the most distant system for which an SZE has been observed. Mass measurements calculated from Chandra observations, in conjunction with the SZA data, are used to compare the properties of our high redshift sample to scaling relations derived at lower redshift, to test for evidence of evolution.

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