X-ray Properties of the First SZE-selected Galaxy Cluster Sample from the South Pole Telescope
Creators: name: Andersson, K.
name: Benson, B. A.
name: Ade, P. A. R.
name: Aird, K. A.
name: Armstrong, B.
name: Bautz, M.
name: Bleem, L. E.
name: Brodwin, M.
name: Carlstrom, J. E.
name: Chang, C. L.
name: Crawford, T. M.
name: Crites, A. T.
name: de Haan, T.
name: Desai, S.
name: Dobbs, M. A.
name: Dudley, J. P.
name: Foley, R. J.
name: Forman, W. R.
name: Garmire, G.
name: George, E. M.
name: Gladders, M. D.
name: Halverson, N. W.
name: High, F. W.
name: Holder, G. P.
name: Holzapfel, W. L.
name: Hrubes, J. D.
name: Jones, C.
name: Joy, M.
name: Keisler, R.
name: Knox, L.
name: Lee, A. T.
name: Leitch, E. M.
name: Lueker, M.
name: Marrone, D. P.
name: McMahon, J. J.
name: Mehl, J.
name: Meyer, S. S.
name: Mohr, J. J.
name: Montroy, T. E.
name: Murray, S. S.
name: Padin, S.
name: Plagge, T.
name: Pryke, C.
name: Reichardt, C. L.
name: Rest, A.
name: Ruel, J.
name: Ruhl, J. E.
name: Schaffer, K. K.
name: Shaw, L.
name: Shirokoff, E.
name: Song, J.
name: Spieler, H. G.
name: Stalder, B.
name: Staniszewski, Z.
name: Stark, A. A.
name: Stubbs, C. W.
name: Vanderlinde, K.
name: Vieira, J. D.
name: Vikhlinin, A.
name: Williamson, R.
name: Yang, Y.
name: Zahn, O.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present results of X-ray observations of a sample of 15 clusters selected via their imprint on the cosmic microwave background (CMB) from the thermal Sunyaev-Zel'dovich (SZ) effect. These clusters are a subset of the first SZ-selected cluster catalog, obtained from observations of 178 deg^2 of sky surveyed by the South Pole Telescope. Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T_X, and mass, M_g, of the intracluster medium (ICM) within r_500 for each cluster. From these, we calculate Y_X=M_g T_X and estimate the total cluster mass using a M_500-Y_X scaling relation measured from previous X-ray studies. The integrated Comptonization, Y_SZ, is derived from the SZ measurements, using additional information from the X-ray measured gas density profiles and a universal temperature profile. We calculate scaling relations between the X-ray and SZ observables, and find results generally consistent with other measurements and the expectations from simple self-similar behavior. Specifically, we fit a Y_SZ-Y_X relation and find a normalization of 0.82 +- 0.07, marginally consistent with the predicted ratio of Y_SZ/Y_X=0.91+-0.01 that would be expected from the density and temperature models used in this work. Using the Y_X derived mass estimates, we fit a Y_SZ-M_500 relation and find a slope consistent with the self-similar expectation of Y_SZ ~ M^5/3 with a normalization consistent with predictions from other X-ray studies. We compare the X-ray mass estimates to previously published SZ mass estimates derived from cosmological simulations of the SPT survey. We find that the SZ mass estimates are lower by a factor of 0.89+-0.06, which is within the ~15% systematic uncertainty quoted for the simulation-based SZ masses.
description: 28 pages, 19 figures, submitted to ApJ