Stellar Populations in Field Early--Type Galaxies
- Autor(en)
- F. Annibali, A. Bressan, R. Rampazzo, W. Zeilinger, L. Danese
- Abstrakt
We have acquired intermediate resolution spectra in the 3700-7000Å wavelength range for a sample of 65 early-type galaxies predominantly located in low density environments, a large fraction ofwhich show emission lines. The spectral coverage and the high quality ofthe spectra allowed us to derive Lick line-strength indices and to studytheir behavior at different galacto-centric distances. Ages, metallicities and element abundance ratios have been derived for the galaxy sample by comparison of the line-strength index data set with ournew developed Simple Stellar Population (SSP) models. We have analyzed the behavior of the derived stellar population parameters with thecentral galaxy velocity dispersion and the local galaxy density in order to understand the role played by mass and environment on the evolutionof early-type galaxies. We find that the chemical path is mainly drivenby the halo mass, more massive galaxies exhibiting the more efficient chemical enrichment and shorter star formation timescales. Galaxies in denser environments are on average older than galaxies in less dense environments. The last ones show a large age spread which is likely to be due to rejuvenation episodes.
- Organisation(en)
- Institut für Astrophysik
- Journal
- Astronomical Society of the Pacific Conference Series
- Band
- 374
- Seiten
- 469-474
- Anzahl der Seiten
- 6
- ISSN
- 1050-3390
- Publikationsdatum
- 12-2007
- ÖFOS 2012
- 103004 Astrophysik
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/990cf135-00aa-47dd-809f-c5cea4e8d006