The anatomy of the NGC 5044 group - I. Group membership and dynamics

Abstract

We use a combination of new AAOmega multi-object wide-field spectroscopic observations and literature data to define 111 spectroscopically confirmed members of the massive NGC 5044 group with M_B <= -13.5 mag, providing a three-fold increase in group members over previous analyses of this group. We find the group to have a dynamical mass of 9.2 x 10^13 solar masses, placing it on the border between rich groups and poor clusters. However, comparison to the L_x-sigma and L_x-mass relations shows it more closely follows cluster scaling relations. Using a combination of crossing time, X-ray contours and line-of-sight velocity profile we are able to preclude growth of the NGC 5044 group via major sub-group mergers within the last ~1 Gyr. While the majority of dynamical indicators for the group suggest it is virialised, we find evidence for a small, dynamically distinct sub-group at 1.4 Mpc from the group centre, suggesting that the NGC 5044 group is the dominant structure in its local environment, and is currently accreting smaller groups.

arXiv comment18 pages, 17 figures, accepted by MNRAS. Updated to match proof version

References in corpus (69)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Galaxy Harassment and the Evolution of Clusters of Galaxies
• The epochs of early-type galaxy formation as a function of environment
• Quantifying the bimodal color-magnitude distribution of galaxies
• The Environmental Dependence of the Relations between Stellar Mass, Structure, Star Formation and Nuclear Activity in Galaxies
• The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances
• Simulations of X-ray Clusters
• 2MASS Extended Source Catalog: Overview and Algorithms
• Galaxy Star-Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey
• The 2dF Galaxy Redshift Survey: The environmental dependence of galaxy star formation rates near clusters
• Properties of Galaxy Groups in the SDSS: I.-- The Dependence of Colour, Star Formation, and Morphology on Halo Mass
• The Stellar Population Histories of Early-Type Galaxies. II. Controlling Parameters of the Stellar Populations
• Relationship between environment and the broad-band optical properties of galaxies in the SDSS
• The Average Mass-to-Light Profile of Galaxy Clusters
• The Properties of Poor Groups of Galaxies: I. Spectroscopic Survey and Results
• The dependence on environment of the color-magnitude relation of galaxies
• Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue
• Optical Mass Estimates of Galaxy Clusters
• 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
• Details of the mass--temperature relation for clusters of galaxies
• The GEMS project: X-ray analysis and statistical properties of the group sample
• The impact of mergers on relaxed X-ray clusters - I. Dynamical evolution and emergent transient structures
• The intragroup medium in loose groups of galaxies
• Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations
• The Properties of Poor Groups of Galaxies: II. X-ray and Optical Comparisons
• The Average Mass Profile of Galaxy Clusters
• Evolution Since z=1 of the Morphology-density Relation of Galaxies
• The Lx-T, Lx-sigma and sigma-T relations for groups and clusters of galaxies
• The faint end of the galaxy luminosity function
• What aspects of galaxy environment matter?
• Observational Tests of the Mass-Temperature Relation for Galaxy Clusters
• Velocity Dispersions and X-Ray Temperatures of Galaxy Clusters
• The ESO Nearby Abell Cluster Survey. XI. Segregation of cluster galaxies and subclustering
• Environment, Ram Pressure, and Shell Formation in HoII
• The ESO Nearby Abell Cluster Survey. XIII. The orbits of the different types of galaxies in rich clusters
• Gas stripping in galaxy groups - the case of the starburst spiral NGC 2276
• Second Data Release of the 6dF Galaxy Survey
• The cluster M-T relation from temperature profiles observed with ASCA and ROSAT
• Ram Pressure Stripping in Clusters and Groups
• The mass profile of galaxy clusters out to ~2 r200
• Galaxy Groups at Intermediate Redshift
• XMM-Newton and Chandra Observations of the Galaxy Group NGC 5044. I. Evidence for Limited Multi-Phase Hot Gas
• The LX-sigma Relation for Galaxies and Clusters of Galaxies
• Are X-ray properties of loose groups different from those of compact groups?
• Substructures in WINGS clusters
• Southern GEMS Groups I: Dynamical Properties
• High resolution soft X-ray spectroscopy of the elliptical galaxy NGC 5044. Results from the reflection grating spectrometer on-board XMM-Newton
• Eridanus - A Supergroup in the Local Universe?
• Testing the Hypothesis of the Morphological Transformation from Field Spiral to Cluster S0
• The Group Evolution Multiwavelength Study (GEMS): bimodal luminosity functions in galaxy groups
• Substructure Analysis of Selected Low Richness 2dFGRS Clusters of Galaxies
• The X-ray Luminosity - Velocity Dispersion relation in the REFLEX Cluster Survey
• Galaxy Orbits for Galaxy Clusters in Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey
• Mass-Temperature Relation of Galaxy Clusters: A Theoretical Study
• Ultra-Low Iron Abundances in Distant Hot Gas in Galaxy Groups
• Morphology and luminosity segregation of galaxies in nearby loose groups
• The Group Evolution Multiwavelength Study (GEMS): the Sample and Datasets
• The low-luminosity galaxy population in the NGC 5044 Group
• GMRT Observations of the Group Holmberg 124: Evolution by Tidal Forces and Ram Pressure ?
• The 2dF Galaxy Redshift Survey: correlation with the ROSAT-ESO Flux Limited X-ray (REFLEX) galaxy cluster survey
• Are the nearby groups of galaxies gravitationally bound objects?
• Luminosity Segregation from Merging in Clusters of Galaxies
• Dynamical segregation of galaxies in groups and clusters
• The Discovery of New Galaxy Members in the NGC 5044 and NGC 1052 Groups
• On the Xray Luminosity - velocity dispersion relation of groups of galaxies
• Infant Galaxy Clusters at Low Redshifts?

Cited by in corpus (15)

• The 2MASS Redshift Survey - Description and Data Release
• Ionized outflows in local luminous AGN: what are the real densities and outflow rates?
• Mapping the Dark Side with DEIMOS: Globular Clusters, X-ray Gas, and Dark Matter in the NGC 1407 Group
• VEGAS: A VST Early-type GAlaxy Survey. II. Photometric study of giant ellipticals and their stellar halos
• Estimating turbulent velocities in the elliptical galaxies NGC 5044 and NGC 5813
• Isotropic AGN Heating with Small Radio Quiet Bubbles in the NGC 5044 Group
• The X-ray cavities, filaments and cold fronts in the core of the galaxy group NGC 5044
• The SLUGGS Survey: The mass distribution in early-type galaxies within five effective radii and beyond
• 2MTF III. HI 21cm observations of 1194 spiral galaxies with the Green Bank Telescope
• The impact of sloshing on the intra-group medium and old radio lobe of NGC 5044
• Sloshing cold fronts in galaxy groups and their perturbing disk galaxies: an X-ray, Optical and Radio Case Study
• Galaxy populations in the Antlia cluster - III. Properties of faint early-type galaxies
• The anatomy of the NGC 5044 group -- II. Stellar populations and star-formation histories
• Evolutionary properties of the low-luminosity galaxy population in the NGC5044 Group
• Hard X-ray Emission from the NGC 5044 Group