Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..151c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 151-165.
Astronomy and Astrophysics
Astronomy
37
Galactic Radiation, Seyfert Galaxies, Spaceborne Astronomy, Ultraviolet Spectra, Astronomical Photometry, Atmospheric Attenuation, Cloud Cover, Continuous Spectra, Emission Spectra, Iue, Line Spectra, Periodic Variations, Radiant Flux Density, Spectral Energy Distribution
Scientific paper
Multiple IUE spectra of nine Seyfert 1 galaxies, obtained over four years, were examined. Spectra of Mrk 509, ESO 141-G55, Fairall 9, III Zwicky 2, Mrk 279, NGC 3783, NGC 4593, NGC 7213, and NGC 7469 were examined for evidence of variability in both continuum and emission-line fluxes. All except NGC 7213 and III Zw 2 show 20 percent-80 percent continuum flux variations between 1200 and 1900 angstroms. Variations of 8 percent-30 percent were found in the emission-line fluxes of ESO 141-G55, III Zw 2, NGC 3783, NGC 4593, and NGC 7213. Both the amplitude and the time scale of the continuum variations are uncorrelated with either the UV or X-ray luminosity of the source; the variability may be caused, at least in part, by obscuring clouds along the line of sight from the continuum source.
Chapman N. F. G.
Geller Margaret J.
Huchra John P.
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