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The stellar population and emitting gas in the inner 2-5 kpc for a sample of nine Seyfert 2 galaxies

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The stellar population and emitting gas in the inner 2-5 kpc for a sample of nine Seyfert 2 galaxies

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Título The stellar population and emitting gas in the inner 2-5 kpc for a sample of nine Seyfert 2 galaxies
Autor Storchi-Bergmann, Thaisa
Bica, Eduardo Luiz Damiani
Pastoriza, Miriani Griselda
Abstract We analyse the stellar population and the emitting gas in the inner 2-5 kpc of a sample of nine Seyfert 2 galaxies, using 5-Å resolution spectra in the range 3600-7000 Å. The typical population is old and moderately stronglined, except in IC 5135 which presents star-forming events. The emission-line spectrum is studied after subtraction of the stellar population. Broad Hα components (FWHM = 2000 km s - 1 ) were found for five of the galaxies. The line widths correlate with the criticai densities for the forbidden lines in four of the galaxies and with the ionization potential in three of these, indicating the presence of density stratification and ionization structure. Comparison of our emission-line ratios with smaller aperture data obtained from the literature reveal important changes in the values due to contamination by surrounding gas. Using photo-ionization models we derive gas abundances between solar and two-times solar, with an overabundance of nitrogen in NGC 4939 and 6890, and of nitrogen and sulphur in NGC 1667, relative to the other heavy elements.
Contido em Monthly Notices of the Royal Astronomical Society. London. Vol. 245, no. 4 (Aug. 1990), p. 749-758
Assunto Astrofisica
Galaxias seyfert
Populacoes estelares
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/88370
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