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For refcode 1996MNRAS.278..897S:
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Copyright by Royal Astronomical Society. 1996MNRAS.278..897S The stellar population and featureless continuum in the Seyfert nucleus of NGC 3516 M. Serote-Roos, C. Boisson, M. Joly and M. J. Ward DAEC, Observatoire de Paris, Universite Paris VH, CNRS (VA 173), F- 921 95 Meudon Cedex, France Centro de Astrofisica da Universidade do Porto, Rua do Campo Alegre 823,4100 Porto, Portugal Astrophysics, Nuclear Physics Building, University of Oxford, Keble Road, Oxford OX1 3RH Accepted 1995 June 30. Received 1995 June 27; in original form 1995 February 13 ABSTRACT Long-slit spectroscopy of the Seyfert type 1 galaxy NGC 3516 is used to determine the stellar population of the nuclear region. We show that the the differences in absorption-line equivalent widths for the nucleus and circumnuclear region are consistent with dilution within the nucleus by the presence of a featureless continuum. The dilution is strongest at the short wavelengths. We associate this effect with the onset of an additional featureless continuum component due to the accretion disc. Although strongest in the blue, the dilution still amounts to about 35 per cent of the total nuclear flux at the wavelengths of the red calcium triplet lines. Using the strengths of a large number of absorption lines, we determine the stellar population of the nucleus, which we find contains a significant proportion of super-metal-rich stars (20 per cent). Key words: accretion, accretion discs - galaxies: individual: NGC 3516 - galaxies: nuclei - galaxies: Seyfert.
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