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Central Stellar Populations of S0 Galaxies in the Fornax Cluster

Published online by Cambridge University Press:  01 December 2006

A. G. Bedregal ,
A. Aragón-Salamanca ,
M. R. Merrifield  and
N. Cardiel
A. G. Bedregal
Affiliation:
School of Physics and Astronomy, Univ. of Nottingham, Nottingham, NG7 2RD, U.K.
A. Aragón-Salamanca
Affiliation:
School of Physics and Astronomy, Univ. of Nottingham, Nottingham, NG7 2RD, U.K.
M. R. Merrifield
Affiliation:
School of Physics and Astronomy, Univ. of Nottingham, Nottingham, NG7 2RD, U.K.
N. Cardiel
Affiliation:
Departamento de Astrofísica, Facultad de Físicas, Univ. Complutense de Madrid, Spain
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Abstract

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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 (σ0) as observed in ellipticals (E). However, the stellar population properties of these S0s indicates that the observed trends are produced by relative differences in age and α-element abundances and not in metallicity ([Fe/H]) as previous studies have found in E galaxies. The observed scatter in the line indices versus σ0 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 (VMAX) 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.

Keywords

galaxies: elliptical and lenticularstellar contentkinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 418 - 419
Copyright
Copyright © International Astronomical Union 2007

References

Bedregal, A.G, Aragón-Salamanca, A, Merrifield, M.R, & Milvang-Jensen, B, 2006, MNRAS, 371, 1912Google Scholar
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