IDCS J1433.2+3306: AN INFRARED-SELECTED GALAXY CLUSTER AT z = 1.89
- Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States)
- Department of Physics, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110 (United States)
- Department of Astronomy, University of Florida, Gainesville, FL 32611 (United States)
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)
- NOAO, 950 North Cherry Avenue, Tucson, AZ 85719 (United States)
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 A break. Detected emission lines such as [O II] and H{beta} indicate star formation rates of {approx}>20 M{sub Sun} yr{sup -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{sub f} {approx}> 3.5. The stellar age of the early-type galaxy population is approximately consistent with those of clusters at lower redshift (1 < 1.5) suggesting that clusters at these redshifts are experiencing ongoing or increasing star formation.
- OSTI ID:
- 22092399
- Journal Information:
- Astrophysical Journal, Vol. 756, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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