Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..79..469b&link_type=abstract
Astrophysics and Space Science, vol. 79, no. 2, Oct. 1981, p. 469-481.
Astronomy and Astrophysics
Astronomy
8
Galactic Radiation, Gamma Ray Astronomy, Light Curve, Seyfert Galaxies, Gamma Ray Spectra, Infrared Astronomy, Spiral Galaxies, Ultraviolet Astronomy, X Ray Astronomy
Scientific paper
Light curves at X-ray, ultraviolet, optical and infrared wavelengths of NGC 4151 over the period 1977-1980 are presented together with a summary of the large amount of observational data relating to this Seyfert galaxy. Intensity variations in different wavebands are discussed and compared with recent low energy gamma-ray observations of this object. The positive measurement of gamma radiation in May 1977 is shown to have been characterized by a high optical state and a possible infrared maximum. The data presented are compared with the predictions of some emission mechanisms, which have been proposed to account for the gamma radiation. In particular, a synchrotron self-Compton model, which relates the infrared/optical emission to the X-ray/low energy gamma-ray emission, is discussed.
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