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A Spitzer-Selected Galaxy Cluster at z=1.62 | | C. Papovich
; I. Momcheva
; C. N. A. Willmer
; K. D. Finkelstein
; S. L. Finkelstein
; K.-V. Tran
; M. Brodwin
; J. S. Dunlop
; D. Farrah
; S. A. Khan
; J. Lotz
; P. McCarthy
; R. J. McLure
; M. Rieke
; G. Rudnick
; S. Sivanandam
; | | Date: |
16 Feb 2010 | | Abstract: | 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/IRAC colors,
satisfying [3.6] - [4.5] > -0.1 AB mag. Photometric redshifts derived from
Subaru XMM Deep Survey (BViz-bands), UKIRT Infrared Deep Survey-Ultra-Deep
Survey (UKIDSS-UDS, JK-bands), and from the Spitzer Public UDS survey (3.6-8.0
micron) show that this cluster corresponds to a surface density of galaxies at
z ~ 1.6 that is more than 20 sigma 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. The color-magnitude diagram of the galaxies in this cluster
shows a strong red-sequence, dominated by a population of red galaxies with (z
- J) > 1.7 mag. The photometric redshift 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, corresponding to a formation redshift z_f = 2.40 +/- 0.15, and implying
that most of the stellar mass in this cluster formed during that period. | | Source: | arXiv, 1002.3158 | | Services: | Forum | Review | PDF | Favorites | |
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