SPT-CL J2040–4451: AN SZ-SELECTED GALAXY CLUSTER AT z = 1.478 WITH SIGNIFICANT ONGOING STAR FORMATION

SPT-CL J2040-4451-spectroscopically confirmed at z = 1.478-is the highest-redshift galaxy cluster yet discovered via the Sunyaev-Zel'dovich effect. SPT-CL J2040-4451 was a candidate galaxy cluster identified in the first 720 deg super(2) of the South Pole Telescope Sunyaev-Zel'dovich (SPT-...

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Bibliographic Details
Published in:The Astrophysical journal 2014-10, Vol.794 (1), p.1-14
Main Authors: Bayliss, M B, Ashby, M L N, Ruel, J, Brodwin, M, Aird, K A, Bautz, M W, Benson, B A, Bleem, L E, Bocquet, S, Carlstrom, J E
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Clusters
COSMOLOGICAL MODELS
Cosmology
DISPERSIONS
EMISSION
EVOLUTION
Galactic clusters
GALAXIES
GALAXY CLUSTERS
MASS
PROBABILITY
RED SHIFT
SPECTROSCOPY
Star clusters
Star formation
STARS
TELESCOPES
UNIVERSE
VELOCITY
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Summary:SPT-CL J2040-4451-spectroscopically confirmed at z = 1.478-is the highest-redshift galaxy cluster yet discovered via the Sunyaev-Zel'dovich effect. SPT-CL J2040-4451 was a candidate galaxy cluster identified in the first 720 deg super(2) of the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey, and has been confirmed in follow-up imaging and spectroscopy. From multi-object spectroscopy with Magellan-I/Baade+IMACS wemeasure spectroscopic redshifts for 15 cluster member galaxies, all of which have strong [OII] [lambda][lambda]3727 emission. SPT-CL J2040-4451 has an SZ-measured mass of M sub(500,SZ) = 3.2 + or - 0.8 x 10 super(14) M sub([middot in circle]) h super(-1) sub(70) , corresponding to M sub(200,SZ) = 5.8 + or - 1.4 x 10 super(14) M sub([middot in circle]) h super(-1) sub(70). The velocity dispersion measured entirely from blue star-forming members is [sigma] sub(v) = 1500 + or - 520 km s super(-1). The prevalence of star-forming cluster members (galaxies with >1.5 M yr super(-1)) implies that this massive, high-redshift cluster is experiencing a phase of active star formation, and supports recent results showing a marked increase in star formation occurring in galaxy clusters at z [gap] 1.4. We also compute the probability of finding a cluster as rare as this in the SPT-SZ survey to be >99%, indicating that its discovery is not in tension with the concordance [Lambda]CDM cosmological model.
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1088/0004-637X/794/1/12