Galaxy Clusters at z>=1: Gas Constraints from the Sunyaev-Zel'dovich Array

• Published in: arXiv.org 2010-07
• Main Authors: Culverhouse, T L, Bonamente, M, Bulbul, E, Carlstrom, J E, Gralla, M B, Greer, C, Hasler, N, Hawkins, D, Hennessy, R, Jetha, N N, Joy, M, Lamb, J W, Leitch, E M, Marrone, D P, Miller, A, Mroczkowski, T, Muchovej, S, Pryke, C, Sharp, M, Woody, D, Andreon, S, Maughan, B, Stanford, S A
• Format: Article
• Language: English
• Subjects: Apertures; Error analysis; Galactic clusters; Galaxies; Gas pressure; Parameters; Red shift; Scaling; Self-similarity; Target detection; XMM (spacecraft)
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1007.2853

We present gas constraints from Sunyaev-Zel'dovich (SZ) effect measurements in a sample of eleven X-ray and infrared (IR) selected galaxy clusters at z >=1, using data from the Sunyaev-Zel'dovich Array (SZA). The cylindrically integrated Compton-y parameter, Y , is calculated by fitting the data to a two-parameter gas pressure profile. Where possible, we also determine the temperature of the hot intra-cluster plasma from Chandra and XMM-Newton data, and constrain the gas mass within the same aperture (r_2500 ) as Y . The SZ effect is detected in the clusters for which the X-ray data indicate gas masses above ~ 10^13 Msun, including XMMU J2235-2557 at redshift z = 1.39, which to date is one of the most distant clusters detected using the SZ effect. None of the IR-selected targets are detected by the SZA measurements, indicating low gas masses for these objects. For these and the four other undetected clusters, we quote upper limits on Y and Mgas_SZ , with the latter derived from scaling relations calibrated with lower redshift clusters. We compare the constraints on Y and X-ray derived gas mass Mgas_X-ray to self-similar scaling relations between these observables determined from observations of lower redshift clusters, finding consistency given the measurement error.