The elliptical galaxy NGC 5044: Stellar population and ionized gas; The elliptical galaxy NGC 5044: Stellar population and ionized gas; M. G. Rickes et al

In this work we investigate the stellar population, metallicity distribution and ionized gas in the elliptical galaxy NGC 5044, using long-slit spectroscopy and a stellar population synthesis method. We found differences in the slope of FeI and Mg2 lines gradients, which suggests an enhancement of Α...

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Published in:Proceedings of the International Astronomical Union 2004-03, Vol.2004 (IAUS222), p.201
Main Authors: Rickes, M G, Pastoriza, M G, Bonato, Ch
Format: Article
Language:English
Subjects:
Astronomy
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Summary:In this work we investigate the stellar population, metallicity distribution and ionized gas in the elliptical galaxy NGC 5044, using long-slit spectroscopy and a stellar population synthesis method. We found differences in the slope of FeI and Mg2 lines gradients, which suggests an enhancement of Α elements, particularly towards the central region. The stellar population synthesis shows that the contribution, at Λ5870, of the most metallic and old stellar population ($Z/Z_\odot \sim 0.0$ and 1010 year) is dominant in NGC 5044. The presence of a non-thermal ionization source, such as a low-luminosity AGN and/or shock ionization, is implied by the large values of the ratio [NII]/HΑ observed in all sampled regions. However, the emission lines observed in the external regions indicate the presence of an additional ionization source, probably hot, post-AGB stars. [PUBLICATION ABSTRACT]
ISSN:1743-9213
1743-9221