Computer Science
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004bdmh.confe..56a&link_type=abstract
"Proceedings of "Baryons in Dark Matter Halos". Novigrad, Croatia, 5-9 Oct 2004. Editors: R. Dettmar, U. Klein, P. Salucci. Publ
Computer Science
Scientific paper
We present a preliminary analysis of the sample of early type galaxies of Rampazzo et al. (2005), selected to build a data-set of spectral properties of well studied early-type galaxies showing emission lines. Because of the presence of emission lines, the sample is biased toward objects that might be expected to have ongoing and recent star formation. We have compared the line- strength indices presented in Rampazzo et al. (2005) with Simple Stellar Populations (SSPs) in order to characterize the underlying stellar population of the galaxies. We have derived ages, metallicities and [α/Fe] ratios. The positive trend of the σ-metallicity and σ - [α/Fe] relations is reproduced. The bulk of the galaxies span a range in metallicity from ˜ solar to ˜ twice solar and a range in [α/Fe] from ˜ 0.2 to ˜ 0.4. Furthermore the comparison of the derived parameters at different galactocentric distances shows the presence of negative metallicity gradients from the center outwards.
Annibali Francesca
Bertone Emanuele
Bressan Alessandro
Chavez Miguel
Danese Luigi
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