An X-ray Selected Galaxy Cluster at z=1.26

Abstract

We report the discovery of an X-ray luminous galaxy cluster at z=1.26. RXJ0848.9+4452 was selected as an X-ray cluster candidate in the ROSAT Deep Cluster Survey, on the basis of its spatial extent. Deep optical and near-IR imaging have revealed a galaxy overdensity around the peak of the X-ray emission, with a significant excess of red objects with J-K colors typical of elliptical galaxies at z>1. Spectroscopic observations at the Keck II telescope have secured 6 galaxy redshifts in the range 1.257<z<1.267 (<z>=1.261), within a 35 arcsec radius around the peak X-ray emission. This system lies only 4.2 arcmin away (5.0 h^{-1}_{50} comoving Mpc, q_0=0.5) from the galaxy cluster ClG J0848+4453, which was identified by Stanford et al. (1997) at z=1.273 in a near-IR field galaxy survey, and is also known to be X-ray luminous. Assuming that the X-ray emission is entirely due to hot intra-cluster gas, both these systems have similar rest frame luminosities L_x ~=1x10^{44} ergs/s (0.5-2.0 keV band). In combination with our spectrophotometric data for the entire 30 arcmin^2 field, this suggests the presence of a superstructure, consisting of two collapsed, possibly virialized clusters, the first detected to date at z>1.

To appear in The Astronomical Journal, 24 pages, 8 figures, 1 color jpg plate (fig.7), see http://www.eso.org/~prosati/lynx/plate_fig7.jpg

Cited by in corpus (127)

• The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
• The reversal of the star formation-density relation in the distant universe
• A New Method For Galaxy Cluster Detection I: The Algorithm
• The Evolution of X-ray Clusters of Galaxies
• The Morphology - Density Relation in z ~ 1 Clusters
• Measuring ${\Omega }_m$ with the ROSAT Deep Cluster Survey
• Clusters of Galaxies in the First Half of the Universe from the IRAC Shallow Survey
• Discovery of an X-ray-Luminous Galaxy Cluster at z=1.4
• Searching for Cool Core Clusters at High redshift
• The supernova delay time distribution in galaxy clusters and implications for Type-Ia progenitors and metal enrichment
• Evolution of the Color-Magnitude Relation in Galaxy Clusters at z ~1 from the ACS Intermediate Redshift Cluster Survey
• Properties of Ly-alpha emitters around the radio galaxy MRC 0316-257
• Spectroscopic Confirmation of Two Massive Red-Sequence-Selected Galaxy Clusters at z ~ 1.2 in the SpARCS-North Cluster Survey
• Spectroscopic Confirmation of a Massive Red-Sequence-Selected Galaxy Cluster at z = 1.34 in the SpARCS-South Cluster Survey
• The ROSAT Deep Survey: VI. X-ray sources and Optical identifications of the Ultra Deep Survey
• Early assembly of the most massive galaxies
• The Fundamental Plane at z=1.27: First Calibration of the Mass Scale of Red Galaxies at Redshifts z>1
• LoCuSS: First Results from Strong-lensing Analysis of 20 Massive Galaxy Clusters at z~0.2
• Chandra Detection of a TypeII Quasar at z=3.288
• Extremely red galaxies: age and dust degeneracy solved ?
• Evolution of the Internal Dynamics of Galaxy Clusters
• EDisCS -- the ESO Distant Cluster Survey -- Sample Definition and Optical Photometry
• Chandra and XMM-Newton Observations of RDCS1252.9-2927, A Massive Cluster at z=1.24
• The 160 Square Degree ROSAT Survey: the Revised Catalog of 201 Clusters with Spectroscopic Redshifts
• Iron abundance in the ICM at high redshift
• An IR-Selected Galaxy Cluster at z = 1.41
• Scaling Relations and Overabundance of Massive Clusters at z>~1 from Weak-Lensing Studies with HST
• The progeny of a Cosmic Titan: a massive multi-component proto-supercluster in formation at z=2.45 in VUDS
• Discovery of a Rich Cluster at z = 1.63 using the Rest-Frame 1.6um "Stellar Bump Sequence" Method
• X-ray Clusters of Galaxies as Tracers of Structure in the Universe
• An excess of submm sources near 4C41.17: a candidate proto-cluster at z=3.8?
• A large population of 'Lyman-break' galaxies in a protocluster at redshift z=4.1
• A search for clusters at high redshift - III. Candidate H-alpha emitters and EROs in the PKS 1138-262 proto-cluster at z=2.16
• The Dynamical Status of the Cluster of Galaxies 1E0657-56
• The importance of major mergers in the build up of stellar mass in brightest cluster galaxies at z=1
• Evolution of the Color-Magnitude relation in High-Redshift Clusters: Early-type Galaxies in the Lynx Supercluster at z~1.26
• The X-ray luminous galaxy cluster population at 0.9<z<~1.6 as revealed by the XMM-Newton Distant Cluster Project
• The Observations of Redshift Evolution in Large Scale Environments (ORELSE) Survey : I. The Survey Design and First Results on Cl 0023+0423 at z = 0.84 and RX J1821.6+6827 at z = 0.82
• The WARPS Survey: VI. Galaxy Cluster and Source Identifications from Phase I
• The Intracluster Medium in z > 1 Galaxy Clusters
• The WARPS survey: III. The discovery of an X-ray luminous galaxy cluster at z=0.833 and the impact of X-ray substructure on cluster abundance measurements
• Velocity Dispersions of CNOC Clusters and the Evolution of the Cluster Abundance
• A VLT spectroscopic survey of RX J0152.7-1357, a forming cluster of galaxies at z=0.837
• Spectroscopic Confirmation of Three Red-Sequence Selected Galaxy Clusters at z=0.87, 1.16 and 1.21 from the SpARCS Survey
• Clustering of galaxies around radio quasars at 0.5 < z < 0.8
• Discovery of a very X-ray luminous galaxy cluster at z=0.89 in the WARPS survey
• Spectroscopic Confirmation of the Cl 1604 Supercluster at z~0.9
• An Intensive HST Survey for z>1 Supernovae by Targeting Galaxy Clusters
• Chasing passive galaxies in the early Universe: a critical analysis in CANDELS GOODS-South
• An X-ray Selected Galaxy Cluster at z=1.11 in the Rosat Deep Cluster Survey
• A Definitive Optical Detection of a Supercluster at z = 0.91
• XMM-LSS discovery of a z=1.22 galaxy cluster
• Deep near-infrared imaging of RDCS J1252.9-2927 at z=1.237: The colour-magnitude diagram
• The near-infrared luminosity function of cluster galaxies beyond redshift one
• Early-type galaxies at z = 1.3. I. The Lynx supercluster: cluster and groups at z=1.3. Morphology and color-magnitude relation
• Search Techniques for Distant Galaxies
• SPICES II. Optical and Near-Infrared Identifications of Faint X-Ray Sources from Deep Chandra Observations of Lynx
• VLT and ACS observations of RDCS J1252.9-2927: dynamical structure and galaxy populations in a massive cluster at z=1.237
• Cluster Selection and the Evolution of Brightest Cluster Galaxies
• Feedback and Brightest Cluster Galaxy Formation: ACS Observations of the Radio Galaxy TN J1338--1942 at z=4.1
• Early-type galaxies at z~1.3. IV. Scaling relations in different environments
• Witnessing the assembly at z=1.6 of a galaxy cluster (GMASS ultradeep spectroscopy of galaxies at z~2 - V)
• The XMM Cluster Survey: The Dynamical State of XMMXCS J2215.9-1738 at z=1.457
• Mass and Light in the Supercluster of galaxies : MS0302+17
• Discovery of a High-Redshift (z=0.96) Cluster of Galaxies Using a FIRST Wide-Angle Tailed Radio Source
• Chandra detection of the intracluster medium around 3C294 at z=1.786
• On the X-ray emission of z~2 radio galaxies: IC scattering of the CMB & no evidence for fully-formed potential wells
• Cluster Evolution in the ROSAT North Ecliptic Pole Survey
• Early-Type galaxies at z ~ 1.3. III. On the dependence of Formation Epochs and Star Formation Histories on Stellar Mass and Environment
• The Luminosity Functions of the Galaxy Cluster MS1054-0321 at z=0.83 based on ACS Photometry
• Discovery of a Large Scale Clumpy Structure around the Lynx Supercluster at z~1.27
• The Hubble Space Telescope Cluster Supernova Survey: II. The Type Ia Supernova Rate in High-Redshift Galaxy Clusters
• Batch discovery of nine z~1 clusters using x-ray and K or R,z' images
• The Hubble Space Telescope Cluster Supernova Survey: III. Correlated Properties of Type Ia Supernovae and Their Hosts at 0.9 < z < 1.46
• Ks-band luminosity function of the z=1.237 cluster of galaxies RDCS J1252.9-2927
• Galaxy Population in a Cluster of Galaxies around the Radio Galaxy 3C 324 at z=1.2
• Extremely Red Objects in the Field of QSO 1213-0017: A Galaxy Concentration at z=1.31
• On breaking the age-metallicity degeneracy in early-type galaxies: Outflows versus Star Formation Efficiency
• Early-type galaxies at z~1.3. II. Masses and ages of early-type galaxies in different environments and their dependence on stellar population model assumptions
• Weak-Lensing Detection at z~1.3: Measurement of the Two Lynx Clusters with Advanced Camera for Surveys
• Spectroscopic Confirmation of a Radio-Selected Galaxy Overdensity at z=1.11
• Measuring redshift through X-ray spectroscopy of galaxy clusters: results from Chandra data and future prospects
• Contribution of Lensed SCUBA Galaxies to the Cosmic Infrared Background
• Discovery of a high-z protocluster with tunable filters: the case of 6C0140+326 at z=4.4
• A study of the Sunyaev-Zel'dovich increment using archival SCUBA data
• Spectroscopy of moderately high-redshift RCS-1 clusters
• XMM-Newton Observation of a Distant X-ray Selected Cluster of Galaxies at z=1.26 with Possible Cluster Interaction
• The Chandra Deep Group Survey -- cool core evolution in groups and clusters of galaxies
• The density of extremely red objects around high-z radio-loud AGN
• Spectroscopic Confirmation of two Extremely Massive Protoclusters BOSS1244 and BOSS1542 at $z=2.24$
• The SZ effect as a cosmological discriminator
• Radio galaxy selected clusters at high redshift and associated ERO overdensities
• The Galaxy Environment of a Quasar at z=1.226: A Possible Cluster Merger
• Witnessing the Hierarchical Assembly of the Brightest Cluster Galaxy in a Cluster at z=1.26
• Galaxy Clusters at z>=1: Gas Constraints from the Sunyaev-Zel'dovich Array
• X-ray Groups of Galaxies at 0.5<z<1 in zCOSMOS: Increased AGN Activities in High Redshift Groups
• The galaxy population of the z=1 cluster of galaxies MG2016+112
• An excess of sub-millimetre sources towards z~1 clusters
• Optically-selected clusters at 0.8 < z < 1.3 in the EIS Cluster Survey
• X-Ray Emitting Active Galactic Nuclei from z = 0.6-1.3 in the Intermediate and High-Density Environments of the ORELSE Survey
• Growing up in a megalopolis: Environmental effects on galaxy evolution in a supercluster at z~0.65 in UKIDSS UDS
• Evaluating Tests of Virialization and Substructure Using Galaxy Clusters in the ORELSE Survey
• Discovery of a Supercluster at $z\sim$0.91 and Testing the $\Lambda$CDM Cosmological Model
• Superclustering of Faint Galaxies in the Field of a QSO Concentration at z~1.1
• The structure of the merging RCS 231953+00 Supercluster at z ~ 0.9
• AMI SZ observations and Bayesian analysis of a sample of six redshift-one clusters of galaxies
• ROSAT Blank Field Sources I: Sample Selection and Archival Data
• Detection of 20-30 Mpc-scale Galaxy Structures Embedded in 100 Mpc-scale Structures of Quasars and MgII Absorbers at z~0.8 and z~1.2
• Deciphering the activity and quiescence of high-redshift cluster environments: ALMA observations of ClJ1449+0856 at z=2
• RCS043938-2904.9: A New Rich Cluster of Galaxies at z=0.951
• Isophote Shapes of Early-Type Galaxies in Massive Clusters at $z\sim 1$ and 0
• Discovery of an overdensity of faint red galaxies in the vicinity of the z=1.786 radio galaxy 3C 294
• B3 0003+387: AGN Marked Large-Scale Structure at z=1.47?
• Detection of a CMB decrement towards a cluster of mJy radiosources
• Morphologies in a Cluster of Extremely Red Galaxies with Old Stellar Populations at z=1.34
• Color, spectral and morphological transformations of galaxies in clusters
• Optical Identification of the ASCA Lynx Deep Survey: An Association of QSOs and a Supercluster at z=1.3?
• Environmental impact on star-forming galaxies in a $z\sim 0.9$ cluster during course of galaxy accretion
• The Gemini/HST Galaxy Cluster Project: Environment Effects on the Stellar Populations in the Lynx Clusters at z=1.27
• The origin of X-ray emission of two distant (z>1) cluster candidate with XMM-Newton
• Distant clusters of galaxies in the 2XMM/SDSS footprint: follow-up observations with the LBT
• Deep lensing with a twist: E and B modes in a field with multiple lenses
• Searching for Clusters with SUMSS
• Panchromatic Studies of Distant Clusters of Galaxies
• Low X-Ray Luminosity Galaxy Clusters: Main goals, sample selection, photometric and spectroscopic observations
• High-redshift clusters from NVSS: The TexOx Cluster (TOC) Survey
• The intermediate-redshift galaxy cluster CL 0048-2942. Stellar populations