The hELENa project - I. Stellar populations of early-type galaxies linked with local environment and galaxy mass

Abstract

We present the first in a series of papers in T$h$e role of $E$nvironment in shaping $L$ow-mass $E$arly-type $N$earby g$a$laxies (hELENa) project. In this paper we combine our sample of 20 low-mass early types (dEs) with 258 massive early types (ETGs) from the ATLAS${}^{3D}$ survey - all observed with the SAURON integral field unit (IFU) - to investigate early-type galaxies' stellar population scaling relations and the dependence of the population properties on local environment, extended to the low-σ regime of dEs. The ages in our sample show more scatter at lower σ values, indicative of less massive galaxies being affected by the environment to a higher degree. The shape of the age-σ relation for cluster vs. non-cluster galaxies suggests that cluster environment speeds up the placing of galaxies on the red sequence. While the scaling relations are tighter for cluster than for the field/group objects, we find no evidence for a difference in average population characteristics of the two samples. We investigate the properties of our sample in the Virgo cluster as a function of number density (rather than simple clustrocentric distance) and find that dE ages negatively correlate with the local density, likely because galaxies in regions of lower density are later arrivals to the cluster or have experienced less pre-processing in groups, and consequently used up their gas reservoir more recently. Overall, dE properties correlate more strongly with density than those of massive ETGs, which was expected as less massive galaxies are more susceptible to external influences.

Accepted for publication in MNRAS

References in corpus (24)

• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• Measuring the inclination and mass-to-light ratio of axisymmetric galaxies via anisotropic Jeans models of stellar kinematics
• The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
• Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
• Population Synthesis in the Blue IV: Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations
• 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
• The SAURON project - VI. Line strength maps of 48 elliptical and lenticular galaxies
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. I. On the possible disk nature of bright early-type dwarfs
• The Cosmic Evolution of Metallicity from the SDSS Fossil Record
• Insights on the stellar mass-metallicity relation from the CALIFA survey
• The Role of Environment in the Mass-Metallicity Relation
• The SAURON project - XI. Stellar Populations from Absorption Line Strength Maps of 24 Early-Type Spirals
• The SAMI Galaxy Survey: Spatially resolving the environmental quenching of star formation in GAMA galaxies
• Variations in the initial mass function in early-type galaxies: A critical comparison between dynamical and spectroscopic results
• The SAMI Galaxy Survey: Towards a unified dynamical scaling relation for galaxies of all types
• The relation between stellar populations, structure and environment for dwarf elliptical galaxies from the MAGPOP-ITP
• P-MaNGA: Full spectral fitting and stellar population maps from prototype observations
• An optimized H_βindex for disentangling stellar population ages
• Stellar population gradients in early-type cluster galaxies with VIMOS IFU
• The Initial Mass Function of Early-type Galaxies: no correlation with [Mg/Fe]
• The accretion histories of brightest cluster galaxies from their stellar population gradients
• Simulating the evolution of disc galaxies in a group environment. II. The influence of close-encounters between galaxies
• The Dynamical Origin of Early-Type Dwarfs in Galaxy Clusters: A Theoretical Investigation

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• The Fornax 3D project: a two-dimensional view of the stellar initial mass function in the massive lenticular galaxy FCC 167
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• Young, metal-enriched cores in early-type dwarf galaxies in the Virgo cluster based on colour gradients
• Radial velocities and stellar population properties of 56 MATLAS dwarf galaxies observed with MUSE
• On the accretion of a new group of galaxies onto Virgo: I. Internal kinematics of nine in-falling dEs
• The SAMI-Fornax Dwarfs Survey III: Evolution of [$\alpha$/Fe] in dwarfs, from Galaxy Clusters to the Local Group
• A new class of dark matter-free dwarf galaxies? I. Clues from FCC 224, NGC 1052-DF2 and NGC 1052-DF4
• On the accretion of a new group of galaxies onto Virgo: II. The effect of pre-processing on the stellar population content of dEs
• A new perspective on the stellar Mass-Metallicity Relation of quiescent galaxies from the LEGA-C survey
• Signs of `Everything Everywhere All At Once' formation in low surface brightness globular cluster-rich dwarf galaxies
• Colors of Dwarf Ellipticals from GALEX to WISE
• Machine learning technique for morphological classification of galaxies from SDSS. II. The image-based morphological catalogs of galaxies at 0.02<z<0.1
• Detection of young ($\le$20 Myr) stellar populations in apparently quenched low-mass galaxies using red spectral line indices
• Expanding on the Fundamental Metallicity Relation in Dwarf Galaxies with MUSE
• Non-solar abundance ratios trends of dEs in Fornax Cluster using newly defined high resolution indices
• Brought to Light III: Colors of Disk and Clump Substructures in Dwarf Early-Type Galaxies of the Fornax Cluster
• NGC 147 Corroborates the Break in the Stellar Mass-Stellar Metallicity Relation for Galaxies