Spectroscopic follow-up of a cluster candidate at z = 1.45

Abstract

We have obtained deep optical spectroscopic data of the highest-redshift cluster candidate (z ~ 1.4, CVB13) selected by Van Breukelen et al. (2006) in a photometric optical/infrared catalogue of the Subaru XMM-Newton Deep Field. The data, which comprise 104 targeted galaxies, were taken with the DEep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck 2 telescope and yielded 31 secure redshifts in the range 1.25 < z < 1.54 within a 7' x 4' field centred on CVB13. Instead of one massive cluster at z = 1.4, we find evidence for three projected structures at z = 1.40, z = 1.45, and z = 1.48. The most statistically robust of these structures, at z = 1.454, has six spectroscopically confirmed galaxies. Its total mass is estimated at > 10^14 M_sun and it may therefore be termed a cluster. There is an X-ray source at the cluster position which is marginally spatially resolved but whose X-ray spectrum is too hard to be thermal cluster emission. Its origin could be the summed X-ray emission from active galaxies in, and projected onto, the cluster. Serendipitously we have discovered a cluster at z = 1.28 with a mass of > 10^14 M_sun at the same position on the sky, comprising six spectroscopically confirmed cluster galaxies and at least one additional radio source. The selection of CVB13 for the cluster catalogue was evidently aided by the superposition of other, presumably lower-mass, structures, whereas the single cluster at z = 1.28 contained too few galaxies to be isolated by the same algorithm. Given the complicated nature of such structures, caution must be employed when measuring the mass function of putative high-redshift clusters with photometric techniques alone.

arXiv comment15 pages, 7 figures, 2 tables, accepted for publication in MNRAS The figures in this version are low resolution; for a high-resolution version see http://www-astro.physics.ox.ac.uk/~cvb/cluster_cvb13_v2.ps.gz (replaced to repair broken link for full-resolution version)

References in corpus (40)

• Stellar population synthesis at the resolution of 2003
• Star Formation in Galaxies Along the Hubble Sequence
• Large scale bias and the peak background split
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Mass Function of an X-Ray Flux-Limited Sample of Galaxy Clusters
• The Sunyaev-Zel'dovich Effect
• SWIRE: The SIRTF Wide-area InfraRed Extragalactic Survey
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- II. Submillimetre maps, catalogue and number counts
• The Evolution of the Global Star Formation History as Measured from the Hubble Deep Field
• A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17
• The Red-Sequence Cluster Survey I: The Survey and Cluster Catalogs for Patches RCS0926+37 and RCS1327+29
• K-band Properties of Galaxy Clusters and Groups: Luminosity Function, Radial Distribution and Halo Occupation Number
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies
• The C4 Clustering Algorithm: Clusters of Galaxies in the Sloan Digital Sky Survey
• Quasar Feedback: the Missing Link in Structure Formation
• The Palomar Distant Cluster Survey: I. The Cluster Catalog
• The most distant structure of galaxies known: a protocluster at z=4.1
• Radio imaging of the Subaru/XMM-Newton Deep Field - I. The 100-microJy catalogue, optical identifications, and the nature of the faint radio source population
• The Luminosity Function and Star Formation Rate between Redshifts of 0.07 and 1.47 for Narrow-band Emitters in the Subaru Deep Field
• The Cut & Enhance method : selecting clusters of galaxies from the SDSS commissioning data
• The evolution of the near-IR galaxy Luminosity Function and colour bimodality up to z ~ 2 from the UKIDSS Ultra Deep Survey Early Data Release
• The XMM Cluster Survey: A Massive Galaxy Cluster at z=1.45
• The Slope of the Cluster Elliptical Red Sequence: A Probe of Cluster Evolution
• The oxygen-II luminosity density of the Universe
• Simulating the Sunyaev-Zel'dovich effect(s): including radiative cooling and energy injection by galactic winds
• Detecting Clusters of Galaxies in the Sloan Digital Sky Survey I : Monte Carlo Comparison of Cluster Detection Algorithms
• Chandra and XMM-Newton Observations of RDCS1252.9-2927, A Massive Cluster at z=1.24
• Exploring the X-ray Sky with the XMM-Newton Bright Serendipitous Survey
• Radiative pressure feedback by a quasar in a galactic bulge
• The VIMOS-VLT Deep Survey - The evolution of galaxy clustering per spectral type to z~1.5
• The Intracluster Medium in z > 1 Galaxy Clusters
• The Serendipitous Discovery of a Group or Cluster of young Galaxies at z=2.40 in Deep Hubble Space Telescope WFPC2 Images
• Surveying the Sky with the Arcminute MicroKelvin Imager: Expected Constraints on Galaxy Cluster Evolution and Cosmology
• A deep Chandra observation of the cluster environment of the z=1.786 radio galaxy 3C294
• XMM-LSS discovery of a z=1.22 galaxy cluster
• H0 from an orientation-unbiased sample of SZ and X-ray clusters
• Infrared Mass-to-Light Profile Throughout the Infall Region of the Coma Cluster
• Imaging the Sunyaev-Zel'dovich Effect
• Two 100 Mpc-scale structures in the 3-D distribution of radio galaxies and their implications
• Detection of a CMB decrement towards a cluster of mJy radiosources

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