An IR-selected Galaxy Cluster at z = 1.41
Abstract
We report the discovery of a galaxy cluster at z=1.41. ISCS J143809+341419 was found in the Spitzer/IRAC Shallow Survey of the Boötes field in the NOAO Deep Wide-Field Survey carried out using IRAC. The cluster candidate was initially identified as a high-density region of objects with photometric redshifts in the range 1.3<z<1.5. Optical spectroscopy of a limited number of objects in the region shows that five galaxies within an ~120" diameter region lie at z=1.41+/-0.01. Most of these member galaxies have broadband colors consistent with the expected spectral energy distribution of a passively evolving elliptical galaxy formed at high redshift. The redshift of ISCS J143809+341419 is the highest currently known for a spectroscopically confirmed cluster of galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2005
- DOI:
- 10.1086/499045
- arXiv:
- arXiv:astro-ph/0510655
- Bibcode:
- 2005ApJ...634L.129S
- Keywords:
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- Galaxies: Clusters: General;
- Galaxies: Evolution;
- Galaxies: Formation;
- Astrophysics
- E-Print:
- Accepted for publication in The Astrophysical Journal Letters