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X-ray properties of the first Sunyaev-zel'Dovich Effect selected galaxy cluster sample from the South Pole Telescope

Andersson, K., Benson, B. A., Ade, Peter A. R., Aird, K. A., Armstrong, B., Bautz, M., Bleem, L. E., Brodwin, M., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Crites, A. T., de Haan, T., Desai, S., Dobbs, M. A., Dudley, J. P., Foley, R. J., Forman, W. R., Garmire, G., George, E. M., Gladders, M. D., Halverson, N. W., High, F. W., Holder, G. P., Holzapfel, W. L., Hrubes, J. D., Jones, C., Joy, M., Keisler, R., Knox, L., Lee, A. T., Leitch, E. M., Lueker, M., Marrone, D. P., McMahon, J. J., Mehl, J., Meyer, S. S., Mohr, J. J., Montroy, T. E., Murray, S. S., Padin, S., Plagge, T., Pryke, C., Reichardt, C. L., Rest, A., Ruel, J., Ruhl, J. E., Schaffer, K. K., Shaw, L., Shirokoff, E., Song, J., Spieler, H. G., Stalder, B., Staniszewski, Z., Stark, A. A., Stubbs, C. W., Vanderlinde, K., Vieira, J. D., Vikhlinin, A., Williamson, R., Yang, Y., Zahn, O. and Zenteno, A. 2011. X-ray properties of the first Sunyaev-zel'Dovich Effect selected galaxy cluster sample from the South Pole Telescope. Astrophysical Journal 738 (1) , 48. 10.1088/0004-637X/738/1/48

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We present results of X-ray observations of a sample of 15 clusters selected via their imprint on the cosmic microwave background 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 (SPT). Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T(X) , and mass, M(g) , of the intracluster medium within r (500) for each cluster. From these, we calculate Y(X) = M(g)T(X) and estimate the total cluster mass using an 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 find that the SZ mass estimates, derived from cosmological simulations of the SPT survey, are lower by a factor of 0.78 ± 0.06 relative to the X-ray mass estimates. This offset is at a level of 1.3σ when considering the ~15% systematic uncertainty for the simulation-based SZ masses. Overall, the X-ray measurements confirm that the scaling relations of the SZ-selected clusters are consistent with the properties of other X-ray-selected samples of massive clusters, even allowing for the broad redshift range (0.29 < z < 1.08) of the sample.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: clusters: intracluster medium; X-rays: galaxies: clusters
Publisher: IOPScience
ISSN: 0004-637X
Last Modified: 04 Jun 2017 04:09

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