Journal
ASTROPHYSICAL JOURNAL
Volume 721, Issue 1, Pages 90-97Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/721/1/90
Keywords
galaxies: clusters: individual (SPT-CL J0546-5345); galaxies: distances and redshifts; galaxies: evolution
Categories
Funding
- National Science Foundation [ANT-0638937]
- NSF Physics Frontier Center [PHY-0114422]
- Kavli Foundation
- Gordon and Betty Moore Foundation
- NASA
- Chandra Xray Observatory [SV4-74018, A31]
- W. M. Keck Foundation
- Brinson Foundation
- STFC [ST/G002711/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009649] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009012] Funding Source: National Science Foundation
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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-(+232)(167) km s(-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-200 = 1.0(-0.4)(+0.6) x 10(15) M-circle dot, in agreement with the X-ray and SZE mass measurements. Combining masses from several independent measures leads to a best-estimate mass of M-200 = (7.95 +/- 0.92) x 10(14) M-circle dot. 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.
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