SPT-CL J0205–5829: A z = 1.32 EVOLVED MASSIVE GALAXY CLUSTER IN THE SOUTH POLE TELESCOPE SUNYAEV-ZEL’DOVICH EFFECT SURVEY
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Stalder-2013-SPT-CL J0205-5829_ A.pdf
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Author(s)
Andersson, Karl
Bautz, Marshall W.
McDonald, Michael A.
Date Issued
January 2013
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
Stalder, B., J. Ruel, R. Suhada, M. Brodwin, K. A. Aird, K. Andersson, R. Armstrong, et al. “SPT-CL J0205–5829: A z = 1.32 EVOLVED MASSIVE GALAXY CLUSTER IN THE SOUTH POLE TELESCOPE SUNYAEV-ZEL’DOVICH EFFECT SURVEY.” The Astrophysical Journal 763, no. 2 (January 14, 2013): 93. © 2013 The American Astronomical Society
Version
Final published version
Abstract
The galaxy cluster SPT-CL J0205–5829 currently has the highest spectroscopically confirmed redshift, z = 1.322, in the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey. XMM-Newton observations measure a core-excluded temperature of T[subscript X] = 8.7[+1.0 over –0.8] keV producing a mass estimate that is consistent with the Sunyaev-Zel'dovich-derived mass. The combined SZ and X-ray mass estimate of M [subscript 500] = (4.8 ± 0.8) × 10[superscript 14] h[–1 over 70] M [subscript ☉] makes it the most massive known SZ-selected galaxy cluster at z > 1.2 and the second most massive at z > 1. Using optical and infrared observations, we find that the brightest galaxies in SPT-CL J0205–5829 are already well evolved by the time the universe was <5 Gyr old, with stellar population ages [> over ~]3 Gyr, and low rates of star formation (<0.5 M [subscript ☉] yr[superscript –1]). We find that, despite the high redshift and mass, the existence of SPT-CL J0205–5829 is not surprising given a flat ΛCDM cosmology with Gaussian initial perturbations. The a priori chance of finding a cluster of similar rarity (or rarer) in a survey the size of the 2500 deg[superscript 2] SPT-SZ survey is 69%.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637x/763/2/93
