Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..458b&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 15, 1981, p. 458-463.
Astronomy and Astrophysics
Astronomy
21
Galactic Nuclei, Infrared Astronomy, Radio Sources (Astronomy), Seyfert Galaxies, X Ray Sources, Galactic Radiation, Oso-8, Periodic Variations, Radiant Flux Density, Spaceborne Astronomy, Ubv Spectra, X Ray Spectra
Scientific paper
The nucleus of the Seyfert galaxy NGC 4151 was observed during May and June 1977 at X-ray energies from 20 to 200 keV using the high-energy X-ray spectrometer on OSO 8 at radio frequencies of 2695 and 8085. Data were also taken in the visual, and at infrared wavelengths of 1 to 2 microns, and from 2 to 6 keV using the OSO 8 proportional counter. Optical data showed variability by a factor of 2 within the observing period, which is comparable to the variability in the 2 to 6 keV X-ray flux. No variability, however, was measured at infrared or radio frequencies. The composite spectrum from radio to gamma-ray is plotted, and it is found that the optical and X-ray fluxes varied during the observing period, although it is not known if they varied concurrently.
Beall J. H.
Crannell Carol J.
Dennis Brian R.
Dolan James F.
Frost Kenneth J.
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