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. ORCID: https://orcid.org/0000-0002-5127-0401, 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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Abstract

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:	20 Oct 2022 09:55
URI:	https://orca.cardiff.ac.uk/id/eprint/33531

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