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Nuclear activity and stellar population of a sample of interacting galaxies

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Nuclear activity and stellar population of a sample of interacting galaxies

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Título Nuclear activity and stellar population of a sample of interacting galaxies
Autor Pastoriza, Miriani Griselda
Donzelli, Carlos J.
Bonatto, Charles Jose
Abstract In this paper we investigate the nuclear activity and stellar population in a sample of 27 physical galaxy pairs. Equivalent widths of absorption features are used to characterise the nuclear stellar population according to templates: most galaxies of the sample have important flux contributions from stars younger than 108 years. According to classical diagnosticdiagrams the galaxies in our sample are either classified as H II regions or have emission line ratios near the transition zone between H II regions and LINERs. Based on the observed spectra, only 4 galaxies show LINER properties and 1 nucleus is a Seyfert 2. We found that the spectrum of a transition object (38% of the sample) can be described by a combination of an AGN with an HII region. As a result, 20 galaxies of the present sample may host a low-luminosity active nucleus.
Contido em Astronomy and Astrophysics. Berlin. Vol. 347, no. 1 (July 1999), p. 55-62
Assunto Espectros astronômicos
Galáxias ativas
[en] Galaxies: active
[en] Galaxies: interactions
[en] Galaxies: nuclei
[en] Galaxies: stellar content
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98100
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