Central Stellar Populations of S0 Galaxies in The Fornax Cluster

Details Central Stellar Populations of S0 Galaxies in The Fornax Cluster Central Stellar Populations of S0 Galaxies in The Fornax Cluster

2007-01-29

arxiv.org/abs/astro-ph/0701830v2

Astronomy and Astrophysics

Astrophysics

To appear in the Proceedings of IAU Symposium 241: "Stellar Populations as Building Blocks of Galaxies", 10-16 December, 2006

Scientific paper

10.1017/S1743921307008629

Based on FORS2-VLT long-slit spectroscopy, the analysis of the central absorption line indices of 9 S0 galaxies in the Fornax Cluster is presented. Central indices correlate with central velocity dispersions as observed in ellipticals. However, the stellar population properties of these S0s indicates that the observed trends are produced by relative differences in age and alpha-element abundances and not in metallicity ([Fe/H]) as previous studies have found in elliptical galaxies. The observed scatter in the line indices vs. velocity dispersion relations can be partially explained by the rotationally-supported nature of many of these systems. The presence of tighter line indices vs. maximum (circular) rotational velocity relations confirms this statement. It was also confirmed that the dynamical mass is the driving physical property of all these correlations and in our Fornax S0s it has to be estimated assuming rotational support.

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