Culverhouse, T. L. and Bonamente, M. and Bulbul, E. and Carlstrom, J. E. and Gralla, M. B. and Greer, C. and Hasler, N. and Hawkins, D. and Hennessy, R. and Jetha, N. N. and Joy, M. and Lamb, J. W. and Leitch, E. M. and Marrone, D. P. and Miller, A. and Mroczkowski, T. and Muchovej, S. and Pryke, C. and Sharp, M. and Woody, D. and Andreon, S. and Maughan, B. and Stanford, S. A. (2010) Galaxy Clusters at z ≥ 1: Gas Constraints from the Sunyaev–Zel'dovich Array. Astrophysical Journal Letters, 723 (1). L78-L83. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20101206-092457615
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We present gas constraints from Sunyaev-Zel'dovich (SZ) effect measurements in a sample of 11 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 intracluster 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) M _⊙, 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 M_(gas,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 M_(gas,X-ray) to self-similar scaling relations between these observables determined from observations of lower redshift clusters, finding consistency given the measurement error.
|Additional Information:||© 2010 The American Astronomical Society. Received 2010 July 8; accepted 2010 September 8; published 2010 October 13. The operation of the SZA is supported by the NSF through grant AST-0604982 and AST-0838187. Partial support is also provided from grant PHY-0114422 at the University of Chicago, and by the NSF grants AST-0507545 and AST-05-07161 to Columbia University. CARMA operations are supported by the NSF under a cooperative agreement, and by the CARMA partner universities. S.M. acknowledges support from an NSF Astronomy and Astrophysics Fellowship; C.G., S.M., and M.S. from NSF Graduate Research Fellowships; D.P.M. from NASA Hubble Fellowship grant HF-51259.01.|
|Subject Keywords:||cosmic background radiation – cosmology: observations – galaxies: clusters: general – galaxies: clusters: intracluster medium|
|Classification Code:||PACS: 98.65.Cw; 98.62.Py; 98.65.Hb|
|Official Citation:||T. L. Culverhouse et al 2010 ApJ 723 L78 doi: 10.1088/2041-8205/723/1/L78|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||06 Dec 2010 21:14|
|Last Modified:||26 Dec 2012 12:43|
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