Featureless Continua and Stellar Absorption Lines in the Nuclear Spectra of Seyfert Galaxies

Details Featureless Continua and Stellar Absorption Lines in the Nuclear Spectra of Seyfert Galaxies Featureless Continua and Stellar Absorption Lines in the Nuclear Spectra of Seyfert Galaxies

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19711010n&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #110.10; Bulletin of the American Astronomical Society, Vol. 32, p.1590

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Scientific paper

We use measurements of the strengths of the Ca II triplet and Mg b stellar absorption lines in the nuclear and off-nuclear spectra of Seyfert galaxies to study the origin of the UV/optical continuum. For most of the Seyfert 2 galaies in our sample, dilution by a power-law continuum cannot simultaneously explain objects with strong Ca II triplet and relatively weak Mg b. Evolutionary synthesis models, however, can explain the line strengths of virtually all Sy 2s. Thus the bulk of the nuclear far-red emission is produced by late-type supergiants, which have strong lines, produced in a burst of star formation as found by Terlevich, Diaz & Terlevich (1990). Off-nuclear line strengths suggest that the continuum source is extended, typically a few hundred parsecs across. Also, objects with the strongest evidence for a burst of star formation occupy the region of the IRAS color-color diagram characteristic of starburst galaxies. These results agree with the conclusions of other studies (e.g. Cid Fernandes & Terlevich, 1995; Heckman et al. 1995) that the UV/optical continuum in Seyfert 2 galaxies is produced by a circumnuclear starburst.

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