SPT-CL J0205-5829: A z = 1.32 Evolved massive galaxy cluster in the south pole telescope sunyaev-zel'dovich effect survey
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 TX = 8.7+1.0 −0.8 keV producing a mass estimate that is consi...
Published in: | The Astrophysical Journal |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2013
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Subjects: | |
Online Access: | http://hdl.handle.net/11368/2963121 https://doi.org/10.1088/0004-637X/763/2/93 http://iopscience.iop.org/0004-637X/763/2/93/pdf/0004-637X_763_2_93.pdf |
Summary: | 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 TX = 8.7+1.0 −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 M500 = (4.8±0.8)×1014h−1 70 M 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 >∼3 Gyr, and low rates of star formation (<0.5 M yr−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 deg2 SPT-SZ survey is 69%. |
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