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; F. Pacaud; M. Pierre

doi:10.1088/0004-637X/716/2/1503

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, F. Pacaud, M. Pierre

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227 Scopus citations

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/Infrared Array Camera colors, satisfying ([3.6] - [4.5])_AB> - 0.1mag. 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 2.8arcmin (<1.4Mpc) of the astrometric center of the cluster. A posteriori analysis of the XMM data in this field reveal a weak (4σ) detection in the [0.5-2keV] 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)>1.7mag. 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 0.1Gyr, yielding a formation redshift , and corresponding to the last significant star formation period in these galaxies.

Original language	English (US)
Pages (from-to)	1503-1513
Number of pages	11
Journal	Astrophysical Journal
Volume	716
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/716/2/1503
State	Published - 2010

Keywords

Galaxies: clusters: general
Galaxies: clusters: individual (ClG 0218.3-0510)
Galaxies: evolution
Large-scale structure of universe

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/716/2/1503

Cite this

Papovich, C., Momcheva, I., Willmer, C. N. A., Finkelstein, K. D., Finkelstein, S. L., Tran, K. V., Brodwin, M., Dunlop, J. S., Farrah, D., Khan, S. A., Lotz, J., McCarthy, P., McLure, R. J., Rieke, M., Rudnick, G., Sivanandam, S., Pacaud, F., & Pierre, M. (2010). A spitzer-selected galaxy cluster at z = 1.62. Astrophysical Journal, 716(2), 1503-1513. https://doi.org/10.1088/0004-637X/716/2/1503

Papovich, C, Momcheva, I, Willmer, CNA, Finkelstein, KD, Finkelstein, SL, Tran, KV, Brodwin, M, Dunlop, JS, Farrah, D, Khan, SA, Lotz, J, McCarthy, P, McLure, RJ, Rieke, M, Rudnick, G, Sivanandam, S, Pacaud, F & Pierre, M 2010, 'A spitzer-selected galaxy cluster at z = 1.62', Astrophysical Journal, vol. 716, no. 2, pp. 1503-1513. https://doi.org/10.1088/0004-637X/716/2/1503

@article{3777bdce2177402fb83f12b3c994a3ea,

title = "A spitzer-selected galaxy cluster at z = 1.62",

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/Infrared Array Camera colors, satisfying ([3.6] - [4.5])AB> - 0.1mag. 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 2.8arcmin (<1.4Mpc) of the astrometric center of the cluster. A posteriori analysis of the XMM data in this field reveal a weak (4σ) detection in the [0.5-2keV] 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)>1.7mag. 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 0.1Gyr, yielding a formation redshift , and corresponding to the last significant star formation period in these galaxies.",

keywords = "Galaxies: clusters: general, Galaxies: clusters: individual (ClG 0218.3-0510), Galaxies: evolution, Large-scale structure of universe",

author = "C. Papovich and I. Momcheva and Willmer, {C. N.A.} and Finkelstein, {K. D.} and Finkelstein, {S. L.} and Tran, {K. V.} and M. Brodwin and Dunlop, {J. S.} and D. Farrah and Khan, {S. A.} and J. Lotz and P. McCarthy and McLure, {R. J.} and M. Rieke and G. Rudnick and S. Sivanandam and F. Pacaud and M. Pierre",

year = "2010",

doi = "10.1088/0004-637X/716/2/1503",

language = "English (US)",

volume = "716",

pages = "1503--1513",

journal = "Astrophysical Journal",

issn = "0004-637X",

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T1 - A spitzer-selected galaxy cluster at z = 1.62

AU - Papovich, C.

AU - Momcheva, I.

AU - Willmer, C. N.A.

AU - Finkelstein, K. D.

AU - Finkelstein, S. L.

AU - Tran, K. V.

AU - Brodwin, M.

AU - Dunlop, J. S.

AU - Farrah, D.

AU - Khan, S. A.

AU - Lotz, J.

AU - McCarthy, P.

AU - McLure, R. J.

AU - Rieke, M.

AU - Rudnick, G.

AU - Sivanandam, S.

AU - Pacaud, F.

AU - Pierre, M.

PY - 2010

Y1 - 2010

N2 - 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> - 0.1mag. 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 2.8arcmin (<1.4Mpc) of the astrometric center of the cluster. A posteriori analysis of the XMM data in this field reveal a weak (4σ) detection in the [0.5-2keV] 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)>1.7mag. 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 0.1Gyr, yielding a formation redshift , and corresponding to the last significant star formation period in these galaxies.

AB - 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> - 0.1mag. 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 2.8arcmin (<1.4Mpc) of the astrometric center of the cluster. A posteriori analysis of the XMM data in this field reveal a weak (4σ) detection in the [0.5-2keV] 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)>1.7mag. 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 0.1Gyr, yielding a formation redshift , and corresponding to the last significant star formation period in these galaxies.

KW - Galaxies: clusters: general

KW - Galaxies: clusters: individual (ClG 0218.3-0510)

KW - Galaxies: evolution

KW - Large-scale structure of universe

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EP - 1513

JO - Astrophysical Journal

JF - Astrophysical Journal

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A spitzer-selected galaxy cluster at z = 1.62

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