The link between the masses and central stellar populations of S0 galaxies

Abstract

Using high signal-to-noise ratio VLT/FORS2 long-slit spectroscopy, we have studied the properties of the central stellar populations and dynamics of a sample of S0 galaxies in the Fornax Cluster. The central absorption-line indices in these galaxies correlate well with the central velocity dispersions (Sigma0) in accordance with what previous studies found for elliptical galaxies. However, contrary to what it is usually assumed for cluster ellipticals, the observed correlations seem to be driven by systematic age and alpha-element abundance variations, and not changes in overall metallicity. We also found that the observed scatter in the Index-Sigma0 relations can be partially explained by the rotationally-supported nature of these systems. Indeed, even tighter correlations exist between the line indices and the maximum circular velocity of the galaxies. This study suggests that the dynamical mass is the physical property driving these correlations, and for S0 galaxies such masses have to be estimated assuming a large degree of rotational support. The observed trends imply that the most massive S0s have the shortest star-formation timescales and the oldest stellar populations.

arXiv comment21 pages, 17 figures, 9 tables, accepted for publication in MNRAS

References in corpus (27)

• Stellar population synthesis at the resolution of 2003
• The epochs of early-type galaxy formation as a function of environment
• MILES: A Medium resolution INT Library of Empirical Spectra
• Stellar population models of Lick indices with variable element abundance ratios
• Old Stellar Populations. VI. Absorption-Line Spectra of Galaxy Nuclei and Globular Clusters
• The Stellar Population Histories of Local Early-Type Galaxies. I. Population Parameters
• The Fundamental Plane for cluster E and S0 galaxies
• STELIB: a library of stellar spectra at R~2000
• The DEEP Groth Strip Survey II. Hubble Space Telescope Structural Parameters of Galaxies in the Groth Strip
• A new chemo-evolutionary population synthesis model for early-type galaxies. I: Theoretical basis
• 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
• Spatially resolved spectroscopy of Coma cluster early -- type galaxies: III. The stellar population gradients
• E and S0 galaxies in the central part of the Coma cluster: Ages, metal abundances and dark matter
• On the dependence of spectroscopic indices of early-type galaxies on age, metallicity and velocity dispersion
• Reliable random error estimation in the measurement of line-strength indices
• Cluster vs. Field Elliptical Galaxies and Clues on their Formation
• The metal enrichment of elliptical galaxies in hierarchical galaxy formation models
• Exploring Cluster Ellipticals as Cosmological Standard Rods
• Ages of S0 and elliptical galaxies in the Coma cluster
• The Tully-Fisher relation for S0 galaxies
• The evolution of cluster E and S0 galaxies measured from the Fundamental Plane
• On the Origin of the Colour-Magnitude Relation in the Virgo Cluster
• The peculiar motions of early-type galaxies in two distant regions - V. The Mg-sigma relation, age and metallicity
• Using spectroscopic data to disentangle stellar population properties
• Measuring the fading of S0 galaxies using globular clusters
• S0 galaxies in Fornax: data and kinematics
• The Mg-sigma Relation and the Genesis of Early-Type Galaxies

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• The Fornax 3D project: Thick disks in a cluster environment
• The Formation and Evolution of Virgo Cluster Galaxies - II. Stellar Populations
• The nature of dusty starburst galaxies in a rich cluster at z=0.4: the progenitors of lenticulars?
• Stellar population gradients in Fornax Cluster S0 galaxies: connecting bulge and disk evolution
• Stellar population and kinematics of NGC404
• Stellar Population Trends in S0 Galaxies
• Abundance Patterns in the Interstellar Medium of the S0 Galaxy NGC 1316 (Fornax A) Revealed with Suzaku
• The imprint of the thick stellar disc in the mid-plane of three early-type edge-on galaxies in the Fornax cluster
• Abundance Patterns in the Interstellar Medium of Early-type Galaxies Observed with Suzaku
• Ghosts in the Attic: Mapping the Stellar Content of the S0 Galaxy NGC 5102