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The stellar content of active galaxies

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The stellar content of active galaxies

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Título The stellar content of active galaxies
Autor Fernandes Junior, Roberto Cid
Storchi-Bergmann, Thaisa
Schmitt, Henrique Roberto
Abstract We present the results of a long-slit spectroscopic study of 38 active and four normal galaxies. Stellar absorption features, continuum colours and their radial variations are analysed in an effort to characterize the stellar population in these galaxies and detect the presence of a featureless continuum underlying the starlight spectral component. Spatial variations of the equivalent widths of conspicuous absorption lines and continuum colours are detected in most galaxies. Star-forming rings, in particular, leave clear fingerprints in the equivalent widths and colour profiles. We find that the stellar populations in the inner regions of active galaxies present a variety of characteristics, and cannot be represented by a single starlight template. Dilution of the stellar lines by an underlying featureless continuum is detected in most broadlined objects, but little or no dilution is found for most of the 20 type 2 Seyferts in the sample. Colour gradients are also ubiquitous. In particular, all but one of the observed Seyfert 2s are redder at the nucleus than in its immediate vicinity. Possible consequences of these findings are briefly outlined.
Contido em Monthly Notices of the Royal Astronomical Society. London. Vol. 297, no. 2 (June 1998), p. 579-619
Assunto Galaxias
Galaxias seyfert
Nucleo galatico
[en] Galaxies: active
[en] Galaxies: general
[en] Galaxies: nuclei
[en] Galaxies: seyfert
[en] Galaxies: stellar content
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/88373
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