Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..172r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 172-178. Research supported by Aerospace Corp.
Astronomy and Astrophysics
Astrophysics
17
Astronomical Photometry, Early Stars, H Alpha Line, H Beta Line, Lyman Alpha Radiation, Seyfert Galaxies, Ultraviolet Photometry, Visual Photometry, Balmer Series, Far Infrared Radiation, Spectrophotometry, Stellar Luminosity, Ultraviolet Spectra
Scientific paper
The authors present simultaneous ultraviolet and optical observations of the Seyfert 1.8 galaxy Markarian 609. The broad hydrogen lines are in the ratio Lyα/Hβ/Hα = 16/1.0/5.0. The large value of Lyα relative to Hβ and Hα rules out reddening as the source of the steep Balmer decrement. It is argued that optical depths within the broad-line region of this Seyfert 1.8 galaxy differ from those typical of Seyfert 1 galaxies, and accounts for the steep Balmer decrement measured by Osterbrock in 1976. In addition, continuum measurements of Mrk 609 from 1200 Å to 100 μm are discussed. These observations suggest that the powerful far-infrared emission, which dominates the bolometric luminosity, is due primarily to dust heated by a large population of early-type stars rather than by the Seyfert nucleus.
Ake Thomas B.
Cohen Ross D.
Rudy Richard J.
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