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The Nature of the UV-optical Continuum in Seyfert 2 Galaxies

Published online by Cambridge University Press:  25 May 2016

Thaisa Storchi-Bergmann ,
Henrique R. Schmitt  and
Roberto Cid Fernandes
Thaisa Storchi-Bergmann
Affiliation:
Instituto de Física, UFRGS, Campus do Vale, C.P. 15051, CEP 91501-970, Porto Alegre, RS, Brasil
Henrique R. Schmitt
Affiliation:
Instituto de Física, UFRGS, Campus do Vale, C.P. 15051, CEP 91501-970, Porto Alegre, RS, Brasil
Roberto Cid Fernandes
Affiliation:
Departamento de Física, CFM-UFSC, Campus Universitário Trindade, CP476, CEP88040-900, Florianópolis, SC, Brasil

Abstract

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The nature of the UV-Optical continuum in Seyfert 2 galaxies is a matter of current debate, fundamental to which is the issue of characterizing and quantifying the stellar population contribution to the nuclear spectra. Using high S/N long-slit spectroscopy of a sample of 20 Seyfert 2 galaxies, we have applied a novel approach to investigate the nuclear stellar population in these galaxies. Our main results are: (1) the stellar populations in Seyfert 2 galaxies are varied, and in most cases cannot be adequately represented by an elliptical galaxy template, as done in previous works; (2) the central kpc of Seyfert 2's contain substantially larger proportions of 100 Myr stars than either elliptical galaxies or normal spirals of the same Hubble type. One important consequence of our findings is that the controversial nature of the so called “second” featureless continuum (FC2) in Seyfert 2s is most likely a result of inadequate evaluation of the stellar population.

Type
III. AGN Theory and Models
Information
Symposium - International Astronomical Union , Volume 194: Activity in Galaxies and Related Phenomena , 1999 , pp. 295 - 300
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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