Kinematics and Stellar Populations of Low-Luminosity Early-Type Galaxies in the Abell 496 Cluster

Abstract

The morphology and stellar populations of low-luminosity early-type galaxies in clusters have until now been limited to a few relatively nearby clusters such as Virgo or Fornax. Scenarii for the formation and evolution of dwarf galaxies in clusters are therefore not well constrained. We investigate here the morphology and stellar populations of low-luminosity galaxies in the relaxed cluster Abell 496 (z=0.0330). Deep multiband imaging obtained with the CFHT Megacam allowed us to select a sample of faint galaxies (-18.8<M_B<-15.1 mag). We observed 118 galaxies spectroscopically with the ESO VLT FLAMES/Giraffe spectrograph (R=6300). We present structural analysis and colour maps for the 48 galaxies belonging to the cluster. We fit the spectra of 46 objects with PEGASE.HR synthetic spectra to estimate the ages, metallicities, and velocity dispersions. We computed values of $\alpha$/Fe abundance ratios from the measurements of Lick indices. High-precision estimates of stellar population properties have been obtained for a large sample of faint galaxies in a cluster, allowing for the extension of relations between stellar populations and internal kinematics to the low-velocity dispersion regime. We have revealed a peculiar population of elliptical galaxies in the core of the cluster, resembling massive early-type galaxies by their stellar population properties and velocity dispersions, but having luminosities of about 2 mag fainter. External mechanisms of gas removal (ram pressure stripping and gravitational harassment) are more likely to have occurred than internal mechanisms such as supernova-driven winds. The violent tidal stripping of intermediate-luminosity, early-type galaxies in the cluster core can explain the properties of the peculiar elliptical galaxies surrounding the cD galaxy.

arXiv commentAccepted to A&A, 48 pages, 62 figures, 3 tables. This version contains low-resolution figures. We encourage you to get the full-resolution PDF (16Mb) from http://voplus.obspm.fr/DataCollections/Abell0496/

References in corpus (69)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
• The epochs of early-type galaxy formation as a function of environment
• New Insight on Galaxy Formation and Evolution from Keck Spectroscopy of the Hawaii Deep Fields
• The Sixth Data Release of the Sloan Digital Sky Survey
• Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations
• Morphological Transformation from Galaxy Harassment
• Stellar population models of Lick indices with variable element abundance ratios
• The Centers of Early-Type Galaxies with HST. IV. Central Parameter Relations
• Ram Pressure Stripping of Spiral Galaxies in Clusters
• On the shape of the light profiles of early-type galaxies
• The Mass Assembly History of Field Galaxies: Detection of an Evolving Mass Limit for Star Forming Galaxies
• The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies
• HST photometry of dwarf elliptical galaxies in Coma, and an explanation for the alleged structural dichotomy between dwarf and bright elliptical galaxies
• The Morphology-Density Relation in the Sloan Digital Sky Survey
• A database of high and medium-resolution stellar spectra
• Ages and metallicities of early-type galaxies in the SDSS: new insight into the physical origin of the colour-magnitude and the Mg2-sigmaV relations
• Evolutionary synthesis of galaxies at high spectral resolution with the code PEGASE-HR
• Mass downsizing and "top-down" assembly of early-type galaxies
• Improved evidence for a black hole in M32 from HST/FOS spectra - II. Axisymmetric dynamical models
• The merger rate of massive galaxies
• Morphological evolution of disk galaxies in clusters
• Internal Dynamics, Structure and Formation of Dwarf Elliptical Galaxies: II. Rotating Versus Non-Rotating Dwarfs
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. III. Subpopulations: distributions, shapes, origins
• Stellar populations of early-type galaxies in different environments II. Ages and metallicities
• Galaxy threshing and the origin of ultra-compact dwarf galaxies in the Fornax cluster
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. I. On the possible disk nature of bright early-type dwarfs
• The SAURON project - VI. Line strength maps of 48 elliptical and lenticular galaxies
• Internal Dynamics, Structure and Formation of Dwarf Elliptical Galaxies: I. A Keck/HST Study of Six Virgo Cluster Dwarfs
• The Vimos VLT Deep Survey: Stellar mass segregation and large-scale galaxy environment in the redshift range 0.2<z<1.4
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. II. Early-type dwarfs with central star formation
• Rotationally Supported Virgo Cluster Dwarf Elliptical Galaxies: Stripped Dwarf Irregular Galaxies?
• Reliable random error estimation in the measurement of line-strength indices
• A photometric and spectroscopic study of dwarf and giant galaxies in the Coma cluster -- III. Spectral ages and metallicities
• The redshift evolution of early-type galaxies in COSMOS: Do massive early-type galaxies form by dry mergers?
• The effects of environment on morphological evolution between 0<z<1.2 in the COSMOS Survey
• Stellar populations of early-type galaxies in different environments I. Line-strength indices
• Three-dimensional simulations of the interstellar medium in dwarf galaxies - I. Ram pressure stripping
• The SAURON project - XI. Stellar Populations from Absorption Line Strength Maps of 24 Early-Type Spirals
• Kinematic Properties and Stellar Populations of Faint Early-Type Galaxies. I. Velocity Dispersion Measurements of Central Coma Galaxies
• Formation and evolution of dwarf elliptical galaxies I. Structural and kinematical properties
• The star formation history of early-type galaxies as a function of mass and environment
• Evidence for an outer disk in the Prototype `Compact Elliptical' Galaxy M32
• Galaxy Luminosity Functions from Deep Spectroscopic Samples of Rich Clusters
• Kinematics and stellar populations of the dwarf elliptical galaxy IC 3653
• Can Early Type Galaxies Evolve from Fading the Disks of Late Types?
• The relation between stellar populations, structure and environment for dwarf elliptical galaxies from the MAGPOP-ITP
• Stellar populations of early-type galaxies in different environments III. Line-strength gradients
• SDSSJ124155.33+114003.7 -- a Missing Link Between Compact Elliptical and Ultracompact Dwarf Galaxies
• The NOAO Fundamental Plane Survey - III. Variations in the stellar populations of red-sequence galaxies from the cluster core to the virial radius
• HST detection of spiral structure in two Coma Cluster dwarf galaxies
• The nuclear cusp slopes of dwarf elliptical galaxies
• Stellar Populations in Nearby Lenticular Galaxies
• The Nuclear Dynamics of M32. I. Data and Stellar Kinematics
• Stellar Populations of Elliptical Galaxies in Virgo Cluster I. : The Data and Stellar Population Analysis
• Deep and wide field imaging of the Coma cluster: the data
• Chandra Analysis of Abell 496 - No Chemical Gradients Across Cold Fronts
• Line-of-sight velocity distribution corrections for Lick/IDS indices of early-type galaxies
• Extracting Star Formation Histories from Medium-resolution Galaxy Spectra
• Discovery of a new M32-like "Compact Elliptical" galaxy in the halo of the Abell 496 cD galaxy
• Ages and Metallicities of Extragalactic Globular Clusters from Spectral and Photometric Fits of Stellar Population Synthesis Models
• Morphologies and stellar populations of galaxies in the core of Abell 2218
• The galaxy luminosity function of the Abell 496 cluster and its spatial variations
• Formation and Evolution of Dwarf Elliptical Galaxies
• Stellar populations of massive elliptical galaxies in very rich clusters
• A catalogue of velocities in the direction of the cluster of galaxies Abell 496
• Low-Luminosity Early-Type Galaxies in the NGC 128 Group
• Internal kinematics and stellar populations of dE galaxies: Clues to their formation/evolution
• Age, metallicity and alpha-elements abundance in stellar population

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• Structure and Formation of Elliptical and Spheroidal Galaxies
• Analytical approximations of K-corrections in optical and near-infrared bands
• A universal ultraviolet-optical colour-colour-magnitude relation of galaxies
• Families of dynamically hot stellar systems over ten orders of magnitude in mass
• The ACS Fornax Cluster Survey. VI. The Nuclei of Early-Type Galaxies in the Fornax Cluster
• Supermassive black holes and their host spheroids II. The red and blue sequence in the $M_{\mathrm{BH}}-M_{\ast ,\mathrm{sph}}$ diagram
• The (black hole)-bulge mass scaling relation at low masses
• Evolution of dwarf early-type galaxies I. Spatially resolved stellar populations and internal kinematics of Virgo cluster dE/dS0 galaxies
• A Population of Compact Elliptical Galaxies Detected with the Virtual Observatory
• Galaxy bulges and their massive black holes: a review
• Environmental quenching and hierarchical cluster assembly: Evidence from spectroscopic ages of red-sequence galaxies in Coma
• A spectroscopic survey of dwarf galaxies in the Coma Cluster: Stellar populations, environment and downsizing
• Gas sloshing, cold fronts, Kelvin-Helmholtz instabilities and the merger history of the cluster of galaxies Abell 496
• Dynamical versus Stellar Masses of Ultracompact Dwarf Galaxies in the Fornax Cluster
• The HST/ACS Coma Cluster Survey: V - Compact Stellar Systems in the Coma Cluster
• The chemical evolution of galaxies within the IGIMF theory: the [alpha/Fe] ratios and downsizing
• Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes). V. The Complete SMUDGes Catalog and the Nature of Ultra-Diffuse Galaxies
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• RCSED - A Value-Added Reference Catalog of Spectral Energy Distributions of 800,299 Galaxies in 11 Ultraviolet, Optical, and Near-Infrared Bands: Morphologies, Colors, Ionized Gas and Stellar Populations Properties
• Star formation in the local Universe from the CALIFA sample. II. Activation and quenching mechanisms in bulges, bars, and disks
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• The chemical composition of Ultracompact Dwarf Galaxies in the Virgo and Fornax Clusters
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• Stellar Population Constraints on the Dark Matter Content and Origin of Ultra-Compact Dwarf Galaxies
• Isolated compact elliptical galaxies: Stellar systems that ran away
• Stellar populations of Virgo cluster early-type dwarf galaxies with and without discs: a dichotomy in age?
• Evidence for the rapid formation of low mass early-type galaxies in dense environments
• Abundance ratios in red-sequence galaxies over a wide mass range: The "X-planes" for magnesium, calcium, carbon and nitrogen
• Galaxy populations in the Antlia cluster. II. Compact elliptical galaxy candidates
• NGC 6340: an old S0 galaxy with a young polar disc. Clues from morphology, internal kinematics and stellar populations
• An extensive catalogue of early-type galaxies in the nearby Universe
• Transforming gas-rich low-mass disky galaxies into ultra-diffuse galaxies by ram pressure
• Discovery of an isolated compact elliptical galaxy in the field
• Large scale nested stellar discs in NGC 7217
• Using Star Clusters as Tracers of Star Formation and Chemical Evolution: the Chemical Enrichment History of the Large Magellanic Cloud
• Photometric Mass Estimation and the Stellar Mass-Halo Mass Relation for Low Mass Galaxies
• Early-type galaxies at large galactocentric radii - I. Stellar kinematics and photometric properties
• SDSS-IV MaNGA: Environmental dependence of the Mgb/<Fe>-sigma_* relation for nearby galaxies
• On the accretion of a new group of galaxies onto Virgo: II. The effect of pre-processing on the stellar population content of dEs
• Nature vs. nurture in the low-density environment: structure and evolution of early-type dwarf galaxies in poor groups
• Mass-Velocity Dispersion Relation in HIFLUGCS Galaxy Clusters
• Internal Kinematics and Stellar Populations of the Poststarburst+AGN Galaxy SDSS J230743.41+152558.4
• A universal relationship between stellar masses and binding energies of galaxies
• The Influence of Environment on the Chemical Evolution in Low-mass Galaxies
• The Next Generation Virgo Cluster Survey. XXXIII. Stellar Population Gradients in the Virgo Cluster Core Globular Cluster System
• Star Formation History at the Centers of Lenticular Galaxies with Bars and Purely Exponential Outer Disks from SAURON Data
• KDG 64: a large dwarf spheroidal or a small ultradiffuse satellite of Messier 81
• Magellan/M2FS Spectroscopy of Galaxy Clusters: Stellar Population Model and Application to Abell 267