Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..605s&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 605-60
Astronomy and Astrophysics
Astrophysics
2
Galactic Nuclei, Galactic Radiation, Seyfert Galaxies, Ultraviolet Radiation, Carbon, Continuums, Electron Scattering, Iue, Line Spectra, Ultraviolet Spectra
Scientific paper
The IUE spectra of the nuclei of three bright Seyfert-1 galaxies (NGC4151, NGC5548 and Fairall9) were analyzed. They exhibit time variability in their broad emission-line profiles and in the underlying continuum. The detailed nature and the time scale of this variability are different from object to object, but there are unifying similarities. Both the continuum and the C IV 1550 A emission in the IUE spectra can be understood if the broad line region consists, at least in part, of an optically thick atmosphere (or radial wind) expanding from a hot, spherical surface. In two of the objects, electron scattering in this expanding atmosphere has important effects on the C IV emission profile, and continuum, in qualitative agreement with the IUE observations.
Ptak Roger L.
Stoner Ronald E.
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