Quick Search:

uzh logo
Browse by:

Zurich Open Repository and Archive

Maintenance: Tuesday, 5.7.2016, 07:00-08:00

Maintenance work on ZORA and JDB on Tuesday, 5th July, 07h00-08h00. During this time there will be a brief unavailability for about 1 hour. Please be patient.

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-41829

Papovich, C; Momcheva, I; Willmer, C N A; et al; Tran, K V H (2010). A Spitzer-selected Galaxy Cluster at z = 1.62. Astrophysical Journal, 716(2):1503-1513.

Accepted Version
PDF (Accepted manuscript, Version 3)
View at publisher
Accepted Version
PDF (Accepted manuscript, Version 2)
Accepted Version
PDF (Accepted manuscript, Version 1)


We report the discovery of a galaxy cluster at z = 1.62 located in the Spitzer Wide-Area Infrared Extragalactic survey XMM-LSS field. This structure was selected solely as an overdensity of galaxies with red Spitzer/Infrared Array Camera colors, satisfying ([3.6] - [4.5])AB> - 0.1 mag. Photometric redshifts derived from the Subaru XMM Deep Survey (BViz bands), the UKIRT Infrared Deep Survey-Ultra-Deep Survey (UKIDSS-UDS, JK bands), and from the Spitzer Public UDS survey (3.6-8.0 μm) show that this cluster corresponds to a surface density of galaxies at z ≈ 1.6 that is >20σ above the mean at this redshift. We obtained optical spectroscopic observations of galaxies in the cluster region using IMACS on the Magellan telescope. We measured redshifts for seven galaxies in the range z = 1.62-1.63 within 2.8 arcmin (<1.4 Mpc) of the astrometric center of the cluster. A posteriori analysis of the XMM data in this field reveal a weak (4σ) detection in the [0.5-2 keV] band compatible with the expected thermal emission from such a cluster. The color-magnitude diagram of the galaxies in this cluster shows a prominent red sequence, dominated by a population of red galaxies with (z - J)>1.7 mag. The photometric-redshift probability distributions for the red galaxies are strongly peaked at z = 1.62, coincident with the spectroscopically confirmed galaxies. The rest-frame (U - B) color and scatter of galaxies on the red sequence are consistent with a mean luminosity-weighted age of 1.2 ± 0.1 Gyr, yielding a formation redshift \overline{z_f}=2.35 \, \pm \, 0.10, and corresponding to the last significant star formation period in these galaxies.
This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. This paper also includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This work is based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.


141 citations in Web of Science®
143 citations in Scopus®
Google Scholar™



170 downloads since deposited on 02 Mar 2011
47 downloads since 12 months

Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Date:June 2010
Deposited On:02 Mar 2011 10:09
Last Modified:05 Apr 2016 14:33
Publisher:Institute of Physics Publishing
Publisher DOI:10.1088/0004-637X/716/2/1503
Related URLs:http://arxiv.org/abs/1002.3158

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page