Galaxy clusters at z ≥ 1: Gas constraints from the Sunyaev-Zel'dovich array

T. L. Culverhouse, M. Bonamente, E. Bulbul, J. E. Carlstrom, M. B. Gralla, C. Greer, N. Hasler, D. Hawkins, R. Hennessy, N. N. Jetha, M. Joy, J. W. Lamb, E. M. Leitch, D. P. Marrone, A. Miller, T. Mroczkowski, S. Muchovej, C. Pryke, M. Sharp, D. WoodyS. Andreon, B. Maughan, S. A. Stanford

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19 Scopus citations


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 (r2500) as Y. The SZ effect is detected in the clusters for which the X-ray data indicate gas masses above ∼10 13M, 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 andMgas,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.

Original languageEnglish (US)
Pages (from-to)L78-L83
JournalAstrophysical Journal Letters
Issue number1 PART 2
StatePublished - Nov 1 2010
Externally publishedYes


  • Cosmic background radiation
  • Cosmology: observations
  • Galaxies: clusters: general
  • Galaxies: clusters: intracluster medium


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