A fossil galaxy cluster; an X-ray and optical study of RX J1416.4+2315

Abstract

We present a detailed X-ray and optical study of a distant fossil system RX J1416.4+2315 (z=0.13), combining Chandra and XMM-Newton observations, optical photometry and spectroscopy. X-ray emitting hot gas imaged by both the Chandra and XMM-Newton shows a globally relaxed spatial distribution, supporting the idea that fossil groups are old galaxy systems with no recent mergers. However, the diffuse X-ray emission shows signs of asymmetries in the core of the system. With a mean gas temperature of ~ 4.0 keV and total gravitational mass of 3.1 x 10^14 solar mass, within the virial radius, this is better described as a fossil galaxy cluster rather than a fossil group. The temperature profile shows no sign of a significant cooler core despite a cooling time dropping to 5 Gyr within the resolved core. We find a mass concentration parameter c_200 ~ 11 which is relatively high for a cluster of this mass, indicative of an early formation epoch. Using the spectroscopically identified cluster members we present the galaxy luminosity function for this fossil system. We measure the velocity dispersion of the galaxies to be ~ 700 km/s based on 18 confirmed members. The dynamical mass is nearly twice the total gravitational mass derived from the X-ray analysis. The measured R-band mass-to-light ratio, within the virial radius, is ~ 440 M/L (solar) which is not unusual for clusters of galaxies. The central giant elliptical galaxy has discy isophotes and spectral features typical of elliptical galaxies.

arXiv comment10 pages, 10 figures, Accepted for publication in MNRAS

References in corpus (34)

• Profiles of dark haloes: evolution, scatter, and environment
• Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
• Chandra sample of nearby relaxed galaxy clusters: mass, gas fraction, and mass-temperature relation
• Concentrations of Dark Halos from their Assembly Histories
• The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies
• Galaxy Cluster Virial Masses and Omega
• The nature and space density of fossil groups of galaxies
• The Assembly of Galaxies in a Hierarchically Clustering Universe
• The Origin of the Brightest Cluster Galaxies
• The Birmingham-CfA cluster scaling project - III: entropy and similarity in galaxy systems
• The Power Spectrum of Mass Fluctuations Measured from the Lyman-alpha Forest at Redshift z=2.5
• The XMM-Newton EPIC Background: Production of Background Maps and Event Files
• The mass profile of A1413 observed with XMM-Newton: implications for the M-T relation
• The Bright SHARC Survey: The Cluster Catalog
• The Formation of Fossil Galaxy Groups in the hierarchical Universe
• The Isolated Elliptical NGC 1132: Evidence For a Merged Group of Galaxies?
• The WARPS X-ray survey of galaxies, groups and clusters I: Method and first results
• Temperature and entropy profiles of nearby cooling flow clusters observed with XMM-Newton
• An old galaxy group: Chandra X-ray observations of the nearby fossil group NGC 6482
• The WARPS survey - II: The Log(N)-Log(S) relation and the X-ray evolution of low luminosity Clusters of Galaxies
• XMM-Newton observation of the distant (z=0.6) galaxy cluster RX J1120.1+4318
• Entropy scaling in galaxy clusters: insights from an XMM-Newton observation of the poor cluster A1983
• Observational Mass-to-Light Ratio of Galaxy Systems: from Poor Groups to Rich Clusters
• The WARPS Survey: VI. Galaxy Cluster and Source Identifications from Phase I
• XMM-Newton observations of three poor clusters: Similarity in dark matter and entropy profiles down to low mass
• The LX-sigma Relation for Galaxies and Clusters of Galaxies
• Origin of the scatter in the X-ray luminosity of early-type galaxies observed with ROSAT
• ESO 3060170 -- a massive fossil galaxy group with a heated gas core?
• An Optical/X--ray Study of A576, a Galaxy Cluster with a Cold Core
• Cluster Merger Variance and the Luminosity Gap Statistic
• The luminosity function of the fossil group RX J1552.2+2013
• X-ray Constraints on the Intrinsic Shapes and Baryon Fractions of Five Abell Clusters
• The Group Evolution Multiwavelength Study (GEMS): bimodal luminosity functions in galaxy groups
• Scaling relations in early-type galaxies belonging to groups

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• The Mass Assembly of Fossil Groups of Galaxies in the Millennium Simulation
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• The XMM Cluster Survey: The Stellar Mass Assembly of Fossil Galaxies
• Dependency of halo concentration on mass, redshift and fossilness in Magneticum hydrodynamic simulations
• Deep XMM and Chandra observations of ClJ1226.9+3332: A detailed X-ray mass analysis of a z=0.89 galaxy cluster
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• Equilibrium configurations of 11eV sterile neutrinos in MONDian galaxy clusters
• Fossil Groups Origins: I. RX J105453.3+552102 a very massive and relaxed system at z~0.5
• Mining the gap: evolution of the magnitude gap in X-ray galaxy groups from the 3 square degree XMM coverage of CFHTLS
• On the mass-to-light ratios of fossil groups. Are they simply dark clusters?
• Ultimate age-dating method for galaxy groups; clues from the Millennium Simulations
• An Extremely Massive Dry Galaxy Merger in a Moderate Redshift Cluster
• Fossil groups origins II. Unveiling the formation of the brightest group galaxies through their scaling relations
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• Finding Fossil Groups: Optical Identification and X-ray Confirmation
• An optical and X-ray study of the fossil group RX J1340.6+4018
• Are fossil groups a challenge of the Cold Dark Matter paradigm?
• Fossil group origins V. The dependence of the luminosity function on the magnitude gap
• Are fossil groups early-forming galaxy systems?
• Fossil Group Origins VII. Galaxy substructures in fossil systems
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• Fossil groups in the Millennium simulation. From the brightest to the faintest galaxies during the past 8 Gyr
• Optically selected fossil groups; X-ray observations and galaxy properties
• The concentration-velocity dispersion relation in galaxy groups
• Galaxy And Mass Assembly (GAMA): 'No Smoking' zone for giant elliptical galaxies?
• Fossil group origins - VI. Global X-ray scaling relations of fossil galaxy clusters
• J0454-0309: Evidence for a strong lensing fossil group falling into a poor galaxy cluster
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• The impact of the dynamical state of galaxy groups on the stellar populations of central galaxies
• Merger history of central galaxies in Semi-Analytic Models of galaxy formation
• The compact group--fossil group connection: observations of a massive compact group at z=0.22
• The Unusually High Halo Concentration of the Fossil Group NGC 6482: Evidence for Weak Adiabatic Contraction
• Measuring the total and baryonic mass profiles of the very massive CASSOWARY 31 strong lens. A fossil system at z ~ 0.7?
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• On the reliability of photometric and spectroscopic tracers of halo relaxation
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• X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups
• Cosmography from accurate mass modeling of the lens group SDSS J0100+1818: five sources at three different redshifts
• Is Abell 2261 a fossil galaxy cluster in a transitional dynamical state?
• Chandra and HST Snapshots of Fossil System Progenitors
• Independent Evidence for earlier formation epochs of fossil groups of galaxies through the intracluster light: the case for RX J100742.53+380046.6
• Chandra Study of the Massive and Distant Galaxy Cluster SDSS J0150-1005