OSSE observations of NGC 4151

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Abstract

We report results of a 2 week observation of the Seyfert galaxy NGC 4151 with the Oriented Scintillation Spectrometer Experiment (OSSE) instrument on the Compton Gamma Ray Observatory (GRO). The source had a very soft spectrum which is best represented by a broken power law or Sunyaev-Titarchuk thermal Comptonization model. It can be characterized by an exponential shape with an e-folding energy of 39 +/- 2 keV in the energy range 65-300 keV, and an intensity at 100 keV of (2.33 +/- 0.05) x 10^-5^ photons cm^-2^ s^-1^ keV^-1^. Source intensity variability of ~25% was observed during the 14 days of our observations; no significant change in spectral shape was detected for this period. The steepness and shape of the spectrum above 100 keV rule out (χ^2^ probability ~7 x 10^-4^) simple pair cascade models in a compact source which have been suggested for Seyfert galaxies.

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