IDCS J1433.2+3306: AN INFRARED-SELECTED GALAXY CLUSTER AT z=1.89

被引：69

作者：

Zeimann, Gregory R. ^{[1
]}

Stanford, S. A. ^{[1
,2
]}

Brodwin, Mark ^{[3
]}

Gonzalez, Anthony H. ^{[4
]}

Snyder, Gregory F. ^{[5
]}

Stern, Daniel ^{[6
]}

Eisenhardt, Peter ^{[6
]}

Mancone, Conor ^{[4
]}

Dey, Arjun ^{[7
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[2] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA

[3] Univ Missouri, Dept Phys, Kansas City, MO 64110 USA

[4] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[7] Natl Opt Astron Observ, Tucson, AZ 85719 USA

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 756卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: clusters: individual (IDCS J1433.2+3306); galaxies: distances and redshifts; galaxies: evolution; galaxies: formation; galaxies: photometry; galaxies: star formation; ACTIVE GALACTIC NUCLEI; X-RAY SURVEY; STAR-FORMATION; RED-SEQUENCE; DEEP; CONFIRMATION; RESOLUTION; DISCOVERY; SOFTWARE; XBOOTES;

D O I：

10.1088/0004-637X/756/2/115

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of an IR-selected galaxy cluster in the IRAC Distant Cluster Survey (IDCS). New data from the Hubble Space Telescope spectroscopically confirm IDCS J1433.2+3306 at z = 1.89 with robust spectroscopic redshifts for seven members, two of which are based on the 4000 angstrom break. Detected emission lines such as [O II] and H beta indicate star formation rates of greater than or similar to 20 M-circle dot yr(-1) for three galaxies within a 500 kpc projected radius of the cluster center. The cluster exhibits a red sequence with a scatter and color indicative of a formation redshift z(f) greater than or similar to 3.5. The stellar age of the early-type galaxy population is approximately consistent with those of clusters at lower redshift (1 < z < 1.5) suggesting that clusters at these redshifts are experiencing ongoing or increasing star formation.

引用

页数：9

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