OSSE observations of NGC 4151

Michael Maisack, W. N. Johnson, R. L. Kinzer, M. S. Strickman, J. D. Kurfess, G. V. Jung, D. A. Grabelsky, W. R. Purcell, M. P. Ulmer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We report results of a two-week observation of NGC 4151 with the OSSE instrument. The source had a very soft spectrum which falls off exponentially with an e-folding energy of 39.2±1.5 keV in the energy range 65-800 keV, and had an intensity at 100 keV of 2.33±0.05 × 10 -2 photons cm -2 sec -1 MeV -1 . Simple pair cascade models in a compact source, which have been suggested for Seyfert galaxies, cannot explain the steepness and shape of the spectrum above 100 keV. We suggest pair loading and reacceleration as the mechanism responsible for the observed X-ray and gamma-ray spectra and the previously reported luminosity-spectral index correlation between 2-20 keV.

Original languageEnglish (US)
Title of host publicationCompton Gamma-Ray Observatory
EditorsNeil Gehrels, Michael W. Friedlander, Daryl J. Macomb
PublisherAmerican Institute of Physics Inc.
Number of pages5
ISBN (Electronic)1563961040
StatePublished - 1993
EventCompton Symposium - St. Louis, United States
Duration: Oct 15 1992Oct 17 1992

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


ConferenceCompton Symposium
Country/TerritoryUnited States
CitySt. Louis

ASJC Scopus subject areas

  • General Physics and Astronomy


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