SPT-CL J0546-5345: A MASSIVE z >1 GALAXY CLUSTER SELECTED VIA THE SUNYAEV-ZEL’DOVICH EFFECT WITH THE SOUTH POLE TELESCOPE
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Author(s)
Andersson, Karl
Bautz, Marshall W.
Brodwin, M.
Ruel, J.
Ade, P. A. R.
Aird, K. A.
Ashby, M. L. N.
Bazin, G.
Benson, Bradford A.
Bleem, L. E.
Date Issued
August 2010
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Brodwin, M., J. Ruel, P. A. R. Ade, K. A. Aird, K. Andersson, M. L. N. Ashby, M. Bautz, et al. “ SPT-CL J0546-5345: A MASSIVE z >1 GALAXY CLUSTER SELECTED VIA THE SUNYAEV-ZEL’DOVICH EFFECT WITH THE SOUTH POLE TELESCOPE .” The Astrophysical Journal 721, no. 1 (August 26, 2010): 90–97. © 2010 The American Astronomical Society
Version
Final published version
Abstract
We report the spectroscopic confirmation of SPT-CL J0546-5345 at 〈z〉 = 1.067. To date this is the most distant cluster to be spectroscopically confirmed from the 2008 South Pole Telescope (SPT) catalog, and indeed the first z>1 cluster discovered by the Sunyaev–Zel'dovich Effect (SZE). We identify 21 secure spectroscopic members within 0.9 Mpc of the SPT cluster position, 18 of which are quiescent, early-type galaxies. From these quiescent galaxies we obtain a velocity dispersion of 1179[superscript +232 subscript −167] km s[superscript −1], ranking SPT-CL J0546-5345 as the most dynamically massive cluster yet discovered at z>1. Assuming that SPT-CL J0546-5345 is virialized, this implies a dynamical mass of M[subscript 200] = 1.0[superscript +0.6 subscript −0.4] × 10[superscript 15] M[subscript ☉], in agreement with the X-ray and SZE mass measurements. Combining masses from several independent measures leads to a best-estimate mass of M[subscript 200] = (7.95 ± 0.92) × 10[superscript 14] M[subscript ☉]. The spectroscopic confirmation of SPT-CL J0546-5345, discovered in the wide-angle, mass-selected SPT cluster survey, marks the onset of the high-redshift SZE-selected galaxy cluster era.
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/721/1/90
