Evidence for variability of hard X-rays from NGC 4151

Details Evidence for variability of hard X-rays from NGC 4151 Evidence for variability of hard X-rays from NGC 4151

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..510m&link_type=abstract

Astrophysical Journal, Part 1, vol. 233, Oct. 15, 1979, p. 510-513.

Astronomy and Astrophysics

Astronomy

16

Astronomical Models, Galactic Radiation, Gamma Rays, Seyfert Galaxies, X Ray Astronomy, X Ray Sources, Energy Spectra, Radiation Detectors, Scintillation, X Ray Telescopes

Scientific paper

A search for gamma-rays in the 35-keV to 8.7-MeV energy range from the Seyfert galaxy NGC 4151 was made using an actively collimated scintillation detector. Upper limits to the flux in the 100-200-keV energy range are inconsistent with previous observations. Variability on a time scale of several months is indicated. Implications in terms of current models of NGC 4151 are discussed.

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