The radial profiles of the age, metallicity and α/Fe enhancement of the stellar populations in the bulge-dominated region for a sample of eight spiral galaxies with low surface-brightness stellar discs and bulges are presented. Almost all the sample bulges are characterised by young stellar populations, solar α/Fe enhancements and metallicities spanning from high to sub-solar values. No significant gradient in age and α/Fe enhancement is measured, whereas a negative metallicity gradient is found in a few cases. The stellar populations of the bulges hosted by low surface-brightness discs share many properties with those of high surface-brightness galaxies and are therefore likely to have common formation scenarios and evolution histories.
Stellar populations of bulges in galaxies with low surface-brightness discs
MORELLI, LORENZO;CORSINI, ENRICO MARIA;PIZZELLA, ALESSANDRO;DALLA BONTA', ELENA;CESETTI, MARY
2012
Abstract
The radial profiles of the age, metallicity and α/Fe enhancement of the stellar populations in the bulge-dominated region for a sample of eight spiral galaxies with low surface-brightness stellar discs and bulges are presented. Almost all the sample bulges are characterised by young stellar populations, solar α/Fe enhancements and metallicities spanning from high to sub-solar values. No significant gradient in age and α/Fe enhancement is measured, whereas a negative metallicity gradient is found in a few cases. The stellar populations of the bulges hosted by low surface-brightness discs share many properties with those of high surface-brightness galaxies and are therefore likely to have common formation scenarios and evolution histories.
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