[Normal Galaxies, Clusters of Galaxies -- Oral ]

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

Thomas Culverhouse, University of Chicago
Stefano Andreon (OAB Milano), Esra Bulbul (UA Huntsville), Max Bonamente (UA Huntsville), Marshall Joy (NASA Marshall Space Flight Center), John Carlstrom (University of Chicago), Nicole Hasler (UA Huntsville), David Hawkins (Caltech Owens Valley Radio Observatory), Ryan Hennessy (University of Chicago), James Lamb (Caltech Owens Valley Radio Observatory), Erik Leitch (University of Chicago), Daniel Marrone (University of Chicago), Ben Maughan (University of Bristol), Amber Miller (Columbia University), Tony Mroczkowski (University of Penn), Stephen Muchovej (Caltech), Clem Pryke (University of Chicago), Matthew Sharp (University of Chicago), Adam Stanford (UC Davis), David Woody (Caltech Owens Valley Radio Observatory)

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 clusterpopulation 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.