On Mass Concentrations & Magnitude Gaps of Galaxy Systems in the CS82 Survey

Abstract

Galaxy systems with large magnitude gaps - defined as the difference in magnitude between the central galaxy and the brightest satellite in the central region - have been claimed to have earlier formation histories. In this study we measure the mass concentration, as an indicator of early formation, of ensembles of galaxy systems divided by redshift and magnitude gaps in the $r$ band. We use cross-correlation weak lensing measurements with NFW parametric mass profiles to measure masses and concentrations of these ensembles from a catalogue of systems built from the SDSS Coadd by the redMaPPer algorithm. The lensing shear data come from the CFHT Stripe 82 (CS82) survey, and consists of $i$-band images of the SDSS Stripe 82 region. We find that the stack made up of systems with larger magnitude gaps has a high probability of being more concentrated on average, in the lowest redshift slice ($0.2<z<0.4$), both when dividing in quartiles ($P=0.98$) and terciles ($P=0.85$). These results lend credibility to the claim that the magnitude gap is an indicator of earlier formed systems.

arXiv comment10 pages, 5 figures, 5 tables, submitted to the MNRAS

References in corpus (68)

• emcee: The MCMC Hammer
• A Universal Density Profile from Hierarchical Clustering
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Bayesian photometric redshift estimation
• Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology
• Euclid Definition Study Report
• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• Formation of Galaxy Clusters
• redMaPPer I: Algorithm and SDSS DR8 Catalog
• The Structure of Dark Matter Haloes in Hierarchical Clustering Models
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys - III. Application to the Canada-France-Hawaii Telescope Lensing Survey
• CFHTLenS: The Canada-France-Hawaii Telescope Lensing Survey - Imaging Data and Catalogue Products
• How special are Brightest Group and Cluster Galaxies?
• 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
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -I. Methodology and a Fast Fitting Algorithm
• Lensing is Low: Cosmology, Galaxy Formation, or New Physics?
• The SDSS Coadd: 275 deg^2 of Deep SDSS Imaging on Stripe 82
• Robust Optical Richness Estimation with Reduced Scatter
• Masses of galaxy clusters from gravitational lensing
• How universal are the density profiles of dark halos?
• The Formation of Fossil Galaxy Groups in the hierarchical Universe
• The Isolated Elliptical NGC 1132: Evidence For a Merged Group of Galaxies?
• J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
• Precision photometric redshift calibration for galaxy-galaxy weak lensing
• The Herschel Stripe 82 Survey (HerS): Maps and Early Catalog
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -II. Application to Simulations
• Scaling relations in fossil galaxy groups
• An old galaxy group: Chandra X-ray observations of the nearby fossil group NGC 6482
• Cosmology and Astrophysics from Relaxed Galaxy Clusters I: Sample Selection
• Cosmological Constraints From Weak Lensing Peak Statistics With CFHT Stripe 82 Survey
• The Mass Assembly of Fossil Groups of Galaxies in the Millennium Simulation
• The Fossil Phase in the Life of a Galaxy Group
• Weak Lensing by Galaxies in Groups and Clusters: I.--Theoretical Expectations
• Evolution of cosmological dark matter perturbations
• The mass assembly of galaxy groups and the evolution of the magnitude gap
• Current status of weak gravitational lensing
• First Measurement of the Cross-Correlation of CMB Lensing and Galaxy Lensing
• Luminous Red Galaxies in Clusters: Central Occupation, Spatial Distributions, and Mis-centering
• The luminosity function of the fossil group RX J1552.2+2013
• The XMM Cluster Survey: The Stellar Mass Assembly of Fossil Galaxies
• Velocity dispersion, mass and the luminosity function of the fossil cluster RX J1416.4+2315
• Weak lensing mass map and peak statistics in Canada-France-Hawaii Telescope Stripe 82 survey
• Fossil Systems in the 400d Cluster Catalog
• Properties of Dark Matter Haloes and their Correlations: the Lesson from Principal Component Analysis
• The Stripe 82 Massive Galaxy Project I: Catalog Construction
• Mining the gap: evolution of the magnitude gap in X-ray galaxy groups from the 3 square degree XMM coverage of CFHTLS
• Fossil Groups Origins: I. RX J105453.3+552102 a very massive and relaxed system at z~0.5
• On the mass-to-light ratios of fossil groups. Are they simply dark clusters?
• Fossil Groups Origins III. The relation between optical and X-ray luminosities
• First Galaxy-Galaxy Lensing Measurement of Satellite Halo Mass in the CFHT Stripe-82 Survey
• Mind the Gap: Tightening the Mass-Richness Relation with Magnitude Gaps
• Stellar mass-gap as a probe of halo assembly history and concentration: youth hidden among old fossils
• Measuring subhalo mass in redMaPPer clusters with CFHT Stripe 82 Survey
• The Mass-Concentration Relation and the Stellar-to-Halo Mass Ratio in the CFHT Stripe 82 Survey
• Fossil groups origins II. Unveiling the formation of the brightest group galaxies through their scaling relations
• CFHTLenS: A Weak Lensing Shear Analysis of the 3D-Matched-Filter Galaxy Clusters
• Stellar-to-halo mass relation of cluster galaxies
• An optical and X-ray study of the fossil group RX J1340.6+4018
• The luminosities of the brightest cluster galaxies and brightest satellites in SDSS groups
• Evolution of galaxy groups in the Illustris simulation
• 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
• Fossil group origins - VI. Global X-ray scaling relations of fossil galaxy clusters
• Fossil Groups Origins III. Characterization of the sample and observational properties of fossil systems

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