Other
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..758o&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, Dec. 1980-Jan. 1981, p. 758-763.
Other
39
Astronomical Spectroscopy, Forbidden Transitions, H Alpha Line, Line Spectra, Seyfert Galaxies, H Beta Line, Ionizing Radiation, Light Emission, Red Shift, Ultraviolet Radiation
Scientific paper
Between November 1974 and November 1975 the absolute intensity of H beta decreased by a factor of 1.8, while the strength of the forbidden line 4959 A of O III remained constant. The change was accompanied by a change in the nongalaxy component of the continuum light by a comparable factor. The evidence suggests that H alpha also changed by a similar amount. Over a twelve-year interval, the nongalaxy visual continuum changed by a substantially larger amount than H beta, suggesting that relative changes of the UV ionizing radiation and visual nongalaxy radiation are not proportional to each other on this time scale.
Oke Bev J.
Readhead Anthony C. S.
Sargent Wallace L. W.
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