Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 723, Issue 1, Pages L78-L83Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/723/1/L78
Keywords
cosmic background radiation; cosmology: observations; galaxies: clusters: general; galaxies: clusters: intracluster medium
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Funding
- NSF [AST-0604982, AST-0838187, AST-0507545, AST-05-07161]
- University of Chicago [PHY-0114422]
- CARMA partner universities
- NASA [HF-51259.01]
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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 similar to 10(13) M-circle dot, 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,M-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,M-X-ray to self-similar scaling relations between these observables determined from observations of lower redshift clusters, finding consistency given the measurement error.
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