Photometry and long-slit spectroscopy are presented for 14 S0 and spiral galaxies of the Fornax, Eridanus and Pegasus clusters and the NGC 7582 group. The age, metallicity and α/Fe enhancement of the stellar population in the centres and their gradients are obtained using stellar population models with variable element abundance ratios. Most of the sample bulges display solar α/Fe enhancement, no gradient in age, and a negative gradient of metallicity. One of the bulges, that of NGC 1292, is a pseudobulge and the properties of its stellar population are consistent with a slow build-up within a scenario of secular evolution.
Stellar population in bulge of spiral galaxies
MORELLI, LORENZO;PIZZELLA, ALESSANDRO;CORSINI, ENRICO MARIA;BERTOLA, FRANCESCO
2007
Abstract
Photometry and long-slit spectroscopy are presented for 14 S0 and spiral galaxies of the Fornax, Eridanus and Pegasus clusters and the NGC 7582 group. The age, metallicity and α/Fe enhancement of the stellar population in the centres and their gradients are obtained using stellar population models with variable element abundance ratios. Most of the sample bulges display solar α/Fe enhancement, no gradient in age, and a negative gradient of metallicity. One of the bulges, that of NGC 1292, is a pseudobulge and the properties of its stellar population are consistent with a slow build-up within a scenario of secular evolution.File in questo prodotto:
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