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News from bulges hosted by low surface brightness galaxies

Published online by Cambridge University Press:  01 December 2006

Gaspar Galaz
Affiliation:
Departmento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Santiago, Chile
Alvaro Villalobos
Affiliation:
Kapteyn Astronomical Institute, Groningen, The Netherlands
Lorenzo Morelli
Affiliation:
Departmento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Santiago, Chile
Ivan Lacerna
Affiliation:
Departmento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Santiago, Chile
Carlos Donzelli
Affiliation:
IATE, Universidad de Córdoba, Córdoba, Argentina
Leopoldo Infante
Affiliation:
Departmento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Santiago, Chile
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Abstract

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We present new results on stellar populations of bulges in spiral galaxies, from optical and near-IR data (images and spectra). In particular, we analyze a sample of bulges hosted by low surface brightness galaxies (LSBs). Correlations between metallicity, scale lengths of disk and bulges, and HI content are reported, supporting the bulge secular evolution hypothesis, as well as systematics between the derived evolutionary parameters of the embedded stellar populations. Using spectra of moderate resolution, we also investigate the stellar histories of bulges using Lick/IDS indices and recent α-enhancement models. Results indicate that small bulges tend to be smaller and metal poor, compared to larger ones. However, all bulges appear to have been formed in the same time-scale. We present some ongoing studies and some prospects of our research.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Freeman, K. 1970, ApJ, 160, 811CrossRefGoogle Scholar