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Stellar population analysis of two ellipticals

Published online by Cambridge University Press:  01 December 2006

André de C. Milone ,
Miriani Pastoriza  and
Mauro Rickes
André de C. Milone
Affiliation:
Divisão de Astrofísica, Instituto Nacional de Pesquisas Espaciais, Brazil email: acmilone@das.inpe.br
Miriani Pastoriza
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, Brazil
Mauro Rickes
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, Brazil
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Abstract

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The spatial distributions of the mean luminosity-weighted stellar age, metallicity, and α/Fe ratio along both photometric axes of two nearby elliptical galaxies have been obtained using Lick index measurements on long slit spectra in order to reconstruct the star formation history in their kinematically distinct subsystems. Lick indexes were compared with those of single-aged stellar population (SSP) models. A population synthesis method was also applied in order to help disentangling the age-metallicity degeneracy. The stars characteristics are associated with their kinematics: they are older and α-enhanced in the not rotating bulge of NGC 1052 and counter rotating core of NGC 7796, while they show a strong spread of α/Fe and age along the rotating disk of NGC 1052 and an outwards radial decreasing of them outside the core of NGC 7796.

Keywords

Galaxies: elliptical and lenticularcDgalaxies: stellar contentgalaxies: formation.
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 424 - 425
Copyright
Copyright © International Astronomical Union 2007

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