Eight luminous early-type galaxies in nearby pairs and sparse groups I. Stellar populations spatially analysed

Abstract

We present a detailed spatial analysis of stellar populations based on long-slit optical spectra in a sample of eight luminous early-type galaxies selected from nearby sparse groups and pairs, three of them may be interacting with a galaxy of similar mass. We have measured luminosity-weighted averages of age, [M/H], [Fe/H], and [$\alpha$/Fe] to add empirical data relative to the influence of galaxy mass, environment, interaction, and AGN feedback in their formation and evolution. The stellar population of the individual galaxies were determined through the stellar population synthesis code STARLIGHT using semi-empirical simple stellar population models. Radial variations of luminosity-weighted means of age, [M/H], [Fe/H], and [$\alpha$/Fe] were measured up to half of the effective radius of each galaxy. We found trends between these values and the nuclear stellar velocity dispersion. There are also relations between the metallicity/age gradients and the velocity dispersion. Contributions of 1-4 Gyr old stellar populations were found in IC5328 and NGC6758 as well as 4-8 Gyr old ones in NGC5812. Extended gas is present in IC5328, NGC1052, NGC1209, and NGC6758, and the presence of a LINER is identified in all these galaxies. The regions up to one effective radius of all galaxies are dominated by $\alpha$-enhanced metal-rich old stellar populations likely due to rapid star formation episodes that induced efficient chemical enrichment. On average, the age and [$\alpha$/Fe] gradients are null and the [M/H] gradients are negative, although discordant cases were found. We found no correlation between the stellar population properties and the LINER presence as well as between the stellar properties and environment or gravitational interaction, suggesting that the influence of progenitor mass can-not be discarded in the formation and evolution of early-type galaxies.

arXiv comment35 pages, 18 figures

References in corpus (73)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies
• Gasdynamics and Starbursts in Major Mergers
• The epochs of early-type galaxy formation as a function of environment
• A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
• The formation history of elliptical galaxies
• HyperLEDA. III. The catalogue of extragalactic distances
• The Two Phases of Galaxy Formation
• The Stellar Population Histories of Early-Type Galaxies. II. Controlling Parameters of the Stellar Populations
• The Stellar Population Histories of Local Early-Type Galaxies. I. Population Parameters
• The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
• A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA
• Statistical Properties of Collisionless Equal- and Unequal-Mass Merger Remnants of Disk Galaxies
• The Evolutionary History of Lyman Break Galaxies Between Redshift 4 and 6: Observing Successive Generations of Massive Galaxies in Formation
• Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
• The SAURON project - XVII. Stellar population analysis of the absorption line strength maps of 48 early-type galaxies
• Star formation and mass assembly in high redshift galaxies
• The CALIFA survey across the Hubble sequence: Spatially resolved stellar population properties in galaxies
• GRAPE-SPH Chemodynamical Simulation of Elliptical Galaxies I: Evolution of Metallicity Gradients
• The star formation history of Seyfert 2 nuclei
• The history of star-forming galaxies in the Sloan Digital Sky Survey
• The Frequency of Tidal Features Associated with Nearby Luminous Elliptical Galaxies from a Statistically Complete Sample
• A Catalogue and Analysis of Local Galaxy Ages and Metallicities
• A New Diagnostic of Active Galactic Nuclei: Revealing Highly-Absorbed Systems at Redshift>0.3
• Environmental Effects on Satellite Galaxies: The Link Between Concentration, Size and Colour Profile
• Semi-empirical analysis of Sloan Digital Sky Survey galaxies: II. The bimodality of the galaxy population revisited
• The Millennium Galaxy Catalogue: 16 < B_MGC < 24 galaxy counts and the calibration of the local galaxy luminosity function
• The DEEP2 Galaxy Redshift Survey: Evolution of the Color-Density Relation at 0.4 < z < 1.35
• Stellar populations of early-type galaxies in different environments II. Ages and metallicities
• AGN Emission Line Diagnostics and the Mass-Metallicity Relation up to Redshift z~2: the Impact of Selection Effects and Evolution
• The Murmur of the Sleeping Black Hole: Detection of Nuclear Ultraviolet Variability in LINER Galaxies
• The Southern Sky Redshift Survey
• The zCOSMOS Redshift Survey: the role of environment and stellar mass in shaping the rise of the morphology-density relation from z~1
• Red Nuggets at High Redshift: Structural Evolution of Quiescent Galaxies Over 10 Gyr of Cosmic History
• ZFOURGE/CANDELS: On the Evolution of M* Galaxy Progenitors from z=3 to 0.5
• Nearby early-type galaxies with ionized gas. III. Analysis of line-strength indices with new stellar population models
• Nearby Optical Galaxies: Selection of the Sample and Identification of Groups
• Are luminous radio-loud active galactic nuclei triggered by galaxy interactions?
• Stellar populations of early-type galaxies in different environments I. Line-strength indices
• Nearby early-type galaxies with ionized gas.IV. Origin and powering mechanism of the ionized gas
• The stellar accretion origin of stellar population gradients in massive galaxies at large radii
• Uncovering the chemical enrichment and mass-assembly histories of star-forming galaxies
• Colours, Star formation Rates, and Environments of Star forming and Quiescent Galaxies at the Cosmic Noon
• The Shroud Around the Twin Radio Jets in NGC 1052
• Timing the formation and assembly of early-type galaxies via spatially resolved stellar populations analysis
• SDSS-IV MaNGA: stellar population gradients as a function of galaxy environment
• Hunting for Supermassive Black Holes in Nearby Galaxies with the Hobby-Eberly Telescope
• The Nascent Red Sequence at z~2
• The Nuclear Near-Infrared Spectral Properties of Nearby Galaxies
• A new catalogue of ISM content of normal galaxies
• The Number Density of Old Passively-Evolving Galaxies at z=1 in the Subaru/XMM-Newton Deep Survey Field
• A two-phase scenario for bulge assembly in LCDM cosmologies
• X-ray spectral variability of seven LINER nuclei with XMM-Newton and Chandra data
• Nearby early-type galaxies with ionized gas.I. Line-strength indices of the underlying stellar population
• Nearby early-type galaxies with ionized gas VI. The Spitzer-IRS view
• The Cold and Hot Gas Content of Fine-Structure E and S0 Galaxies
• The impact of a non-universal Initial Mass Function on the Star Formation Histories of Early-Type Galaxies
• The Evolutionary History of the Elliptical Galaxy NGC 1052
• Interaction effects on galaxy pairs with Gemini/GMOS- II: Oxygen abundance gradients
• Star Formation Histories of Nearby Elliptical Galaxies: I. Volume Limited Sample
• Kinematic properties of the field elliptical NGC 7507
• Stellar populations in a complete sample of local radio galaxies
• Formation and Evolution of Early-Type Galaxies. III Star formation history as a function of mass and over-density
• Potential of colors for determining age and metallicity of stellar populations
• The Mysterious Merger of NGC6868 and NGC6861 in the Telescopium Group
• The extremely populated globular cluster system of the lenticular galaxy NGC 6861
• Sample of minor merger of galaxies: Optical CCD surface photometry and HII region propertie
• Tests of model predictions for the response of stellar spectra and absorption line indices to element abundance variations
• Isolated elliptical galaxies and their globular cluster systems. II. NGC 7796 - globular clusters, dynamics, companion
• The Carnegie-Irvine Galaxy Survey. IV. A Method to Determine the Average Mass Ratio of Mergers That Built Massive Elliptical Galaxies
• The Global, Local and Cluster Galaxy Luminosity Function
• Ages of Elliptical Galaxies: Single versus Multi Population Interpretation
• The elliptical galaxies NGC 1052 and NGC 7796: stellar populations and abundance alpha/Fe ratio

Cited by in corpus (5)

• Stellar Population and Elemental Abundance Gradients of Early-type Galaxies
• Revisiting stellar properties of star-forming galaxies with stellar and nebular spectral modelling
• The S-PLUS Fornax Project (S+FP): Mapping H$\alpha$+[NII] emission in 77 Fornax galaxy members reaching $\sim$4 Rvir
• The physical properties and the evolution of the interacting system AM1204-292
• A study of interacting galaxies from the Arp-Madore Catalogue: Triggering of star formation and nuclear activity