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The elliptical galaxy NGC 5044 : stellar population and ionized gas

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The elliptical galaxy NGC 5044 : stellar population and ionized gas

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Título The elliptical galaxy NGC 5044 : stellar population and ionized gas
Autor Rickes, Mauro Cristian Garcia
Pastoriza, Miriani Griselda
Bonatto, Charles Jose
Abstract 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 metalline profiles along the galaxy which suggests an enhancement of α elements, particularly towards the central region. The stellar population synthesis showed that the component with [Z/Zѳ] ~ 0.0 dominates the λ5870 Å flux in the central region of NGC 5044, contributing with ~42% of the total flux, while in the external regions the contribution decreases to ~8.0%. The component with [Z/Zѳ] ~ −0.4 contributes with ~32% in the central region, and ~55% in the external regions. The component with [Z/Zѳ] ~ −1.1 contributes with ~26% in the central region, and ~37% in the external regions. The three components have ~10¹° years. 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 [N II]/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.
Contido em Astronomy and Astrophysics. Berlin. Vol. 419, no. 2 (May 2004), p. 449-458
Assunto Estrelas gigantes
Galáxias ativas
Gas ionizado
Nucleo galatico
Populacoes estelares
[en] Galaxies: elliptical and lenticular, cD
[en] Galaxies: fundamental parameters
[en] Galaxies: individual: NGC5044
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98763
Arquivos Descrição Formato
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