Journal
ASTROPHYSICAL JOURNAL
Volume 753, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0004-637X/753/2/162
Keywords
cosmic background radiation; cosmology: observations; galaxies: clusters: individual (IDCS J1426.5+3508); galaxies: clusters: intracluster medium; galaxies: evolution
Categories
Funding
- National Science Foundation [AST-0838187, PHY-0114422]
- CARMA
- NASA
- NASA by JPL/Caltech
- Smithsonian Astrophysical Observatory
- NASA [G09-0150A, NAS 5-26555]
- NASA through Space Telescope Science Institute [11663, 12203]
- W. M. Keck Foundation
- U.S. Department of Energy [W-7405-ENG-48]
- CARMA construction
- [SV4-74018, A31]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0838187, 1140019] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1125897] Funding Source: National Science Foundation
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We report 31 GHz CARMA observations of IDCS J1426.5+3508, an infrared-selected galaxy cluster at z = 1.75. A Sunyaev-Zel'dovich (SZ) decrement is detected toward this cluster, indicating a total mass of M-200,M-m = (4.3 +/- 1.1) x 10(14) M-circle dot in agreement with the approximate X-ray mass of similar to 5 x 10(14) M-circle dot. IDCS J1426.5+3508 is by far the most distant cluster yet detected via the SZ effect, and the most massive z >= 1.4 galaxy cluster found to date. Despite the mere similar to 1% probability of finding it in the 8.82 deg(2) IRAC Distant Cluster Survey, IDCS J1426.5+3508 is not completely unexpected in Lambda CDM once the area of large, existing surveys is considered. IDCS J1426.5+3508 is, however, among the rarest, most extreme clusters ever discovered and indeed is an evolutionary precursor to the most massive known clusters at all redshifts. We discuss how imminent, highly sensitive SZ experiments will complement infrared techniques for statistical studies of the formation of the most massive galaxy clusters in the z > 1.5 universe, including potential precursors to IDCS J1426.5+3508.
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