Observations of High-Redshift X-Ray Selected Clusters with the Sunyaev-Zel'dovich Array

• Published in: The Astrophysical journal Vol. 663; no. 2; pp. 708 - 716
• Main Authors: Muchovej, Stephen, Mroczkowski, Tony, Carlstrom, John E, Cartwright, John, Greer, Christopher, Hennessy, Ryan, Loh, Michael, Pryke, Clem, Reddall, Ben, Runyan, Marcus, Sharp, Matthew, Hawkins, David, Lamb, James W, Woody, David, Joy, Marshall, Leitch, Erik M, Miller, Amber D
• Format: Journal Article
• Language: English
• Published: Chicago, IL IOP Publishing 10-07-2007; University of Chicago Press
• Subjects: Astronomy; Earth, ocean, space; Exact sciences and technology; Galaxy clusters; galaxies: clusters: individual (Cl J1226.9+3332, Cl J1415.1+3612, Cl J1429.0+4241); Red shift; Galaxies; galaxies: individual (NGC 5529) ¯ techniques: interferometric; Cosmic background radiation; cosmic microwave background; Cosmology; cosmology: observations
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1086/511971

We report measurements of the Sunyaev-Zel'dovich (SZ) effect in three high-redshift ( super(0.89 less than or equal to z less than or equal to 1.03)), X-ray selected galaxy clusters. The observations were obtained at 30 GHz during the commissioning period of a new, eight-element interferometer-the Sunyaev-Zel'dovich Array (SZA)-built for dedicated SZ effect observations. The SZA observations are sensitive to angular scales larger than those subtended by the virial radii of the clusters. Assuming isothermality and hydrostatic equilibrium for the intracluster medium and gas-mass fractions consistent with those for clusters at moderate redshift, we calculate electron temperatures, gas masses, and total cluster masses from the SZ data. The SZ-derived masses, integrated approximately to the virial radii, are 1.9 sub(-0.1) x 10 super(14) M for Cl J1415.1+3612, 3.4 super(?) sub(-) super(?) sub(0) super(?) sub(.) super(0) sub(5) super(.6) x 10 super(14) M for Cl J1429.0+4241, and 7.2 super(?) sub(-) super(?) sub(0) super(?) sub(.) super(1) sub(9) super(.3) x 10 super(14) M for Cl J1226.9+3332. The SZ-derived quantities are in good agreement with the cluster properties derived from X-ray measurements.