SDSS-IV MaNGA: Environmental dependence of the Mgb/<Fe>-sigma_* relation for nearby galaxies

Abstract

We use a sample of ~3000 galaxies from the MaNGA MPL-7 internal data release to study the alpha abundance distribution within low-redshift galaxies. We use the Lick index ratio Mgb/<Fe> as an alpha abundance indicator to study relationships between the alpha abundance distribution and galaxy properties such as effective stellar velocity dispersion within 0.3 effective radii (sigma_*), galaxy environment, and dark matter halo formation time (z_f). We find that (1) all galaxies show a tight correlation between Mgb/<Fe> and sigma_*; (2) `old' (H_beta < 3) low-sigma_* galaxies in high local density environment and inner regions within galaxy groups are enhanced in Mgb/<Fe>, while `young' (H_beta>3) galaxies and high-mass galaxies show no or less environmental dependence; (3) `old' galaxies with high-z_f show enhanced Mgb/<Fe> over low- and medium-z_f; (4) Mgb/<Fe> gradients are close to zero and show dependence on sigma_* but no obvious dependence on the environment or z_f. Our study indicates that stellar velocity dispersion or galaxy mass is the main parameter driving the Mgb/<Fe> enhancement, although environments appear to have modest effects, particularly for low- and medium-mass galaxies.

Accepted for publication in ApJ

References in corpus (34)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• A systematic variation of the stellar initial mass function in early-type galaxies
• Strangulation as the primary mechanism for shutting down star formation in galaxies
• Properties of Dark Matter Haloes in Clusters, Filaments, Sheets and Voids
• The MaNGA Integral Field Unit Fiber Feed System for the Sloan 2.5 m Telescope
• The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
• The Data Reduction Pipeline for the SDSS-IV MaNGA IFU Galaxy Survey
• The SDSS-IV MaNGA Sample: Design, Optimization, and Usage Considerations
• SDSS-IV MaNGA IFS Galaxy Survey --- Survey Design, Execution, and Initial Data Quality
• Population Synthesis in the Blue IV: Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations
• Color Profiles of Spiral Galaxies: Clues on Outer-Disk Formation Scenarios
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field I: Hamiltonian Markov Chain Monte Carlo Method with Particle Mesh Dynamics
• The Assembly Histories of Quiescent Galaxies Since z=0.7 from Absorption Line Spectroscopy
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field III: Constrained Simulation in the SDSS Volume
• SDSS IV MaNGA: The global and local stellar mass assemby histories of galaxies
• Stellar populations of early-type galaxies in different environments I. Line-strength indices
• SDSS-IV MaNGA: environmental dependence of stellar age and metallicity gradients in nearby galaxies
• The SAMI Galaxy Survey: Global stellar populations on the size-mass plane
• The relation between stellar populations, structure and environment for dwarf elliptical galaxies from the MAGPOP-ITP
• SDSS-IV MaNGA: stellar population gradients as a function of galaxy environment
• Reconstructing the cosmic density field with the distribution of dark matter halos
• ELUCID IV: Galaxy Quenching and its Relation to Halo Mass, Environment, and Assembly Bias
• The star formation history of galaxies: the role of galaxy mass, morphology and environment
• Kinematics and Stellar Populations of Low-Luminosity Early-Type Galaxies in the Abell 496 Cluster
• Stellar populations in the bulges of isolated galaxies
• A deep AAOmega survey of low-luminosity galaxies in the Shapley Supercluster: Stellar population trends
• An isolated, compact early-type galaxy with a diffuse stellar component: merger origin?
• Bimodality in low luminosity E and S0 galaxies
• The Influence of Environment on the Chemical Evolution in Low-mass Galaxies

Cited by in corpus (14)

• On the environmental influence of groups and clusters of galaxies beyond the virial radius: Galactic conformity at few Mpc scales
• The SAMI-Fornax Dwarfs Survey III: Evolution of [$\alpha$/Fe] in dwarfs, from Galaxy Clusters to the Local Group
• Low-mass compact elliptical galaxies: spatially-resolved stellar populations and kinematics with the Keck Cosmic Web Imager
• Semi-analytic spectral fitting: simultaneously modelling the mass accumulation and chemical evolution in MaNGA spiral galaxies
• SDSS-IV MaNGA: The [$\alpha$/Fe] of Early-Type Galaxies
• Age and metal gradients in massive quiescent galaxies at $0.6\lesssim z\lesssim 1.0$: implications for quenching and assembly histories
• Ages and metallicities of quiescent galaxies: confronting broadband ($UVJ$) colours with stellar absorption lines
• Are Milky-Way-like galaxies like the Milky Way? A view from SDSS-IV/MaNGA
• Are early-type galaxies quenched by present-day environment? A study of dwarfs in the Fornax Cluster
• The impact of environment on the lives of disk galaxies as revealed by SDSS-IV MaNGA
• The Formation and Evolution of Massive Galaxies
• Assessing the connection between galactic conformity and assembly-type bias
• Contrasting evolutionary pathways of fast- and slow-rotating galaxies in the green valley
• SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass