Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..624m&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 91, Oct.-Nov. 1979, p. 624-627. Research supported by the Research Corp
Astronomy and Astrophysics
Astronomy
12
Astronomical Models, Astronomical Photometry, Galactic Radiation, Light Emission, Seyfert Galaxies, Electrophotometry, Emission Spectra, Line Spectra, Luminosity, Nonthermal Radiation, Relativistic Effects
Scientific paper
The Seyfert 1 galaxy, Arakelian 120, has undergone an optical flare from October 1977 to September 1978. The most rapid change in brightness detected was a change of 0.24 m in 25 days. This variation implies an upper limit on the size of the optical source region of 0.0202 pc based on light-travel-time arguments (assuming no relativistic effects). The optical variability and color variations are consistent with a composite galaxy-nonthermal central source model in which the nonthermal central source varies both in luminosity and color. A second possible interpretation is that the variations in color and brightness are due to variability in both the broad emission lines which are present and in the nonthermal continuum.
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