Long-Term Monitoring of NGC 4151 by OSSE

Details Long-Term Monitoring of NGC 4151 by OSSE Long-Term Monitoring of NGC 4151 by OSSE

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482..173j&link_type=abstract

Astrophysical Journal v.482, p.173

Astronomy and Astrophysics

Astronomy

28

Galaxies: Individual Ngc Number: Ngc 4151, Galaxies: Seyfert, Gamma Rays: Observations

Scientific paper

We report results of over 5 yr monitoring of the Seyfert galaxy NGC 4151 by the Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory. A total of more than 139 days of observations in the energy band 50 keV--10 MeV was obtained in 11 viewing periods. These observations show a photon spectrum in the 50--800 keV band that is well described by an exponentially cutoff power law of the form Phi (E) ~ E-1.6e-E/100 keV. Long-term luminosity changes of no more than a factor of 2 are observed with only modest change in the spectral shape. With these data we set the most sensitive limit to date on positron annihilation radiation from a Seyfert active galactic nucleus and address the role of e+/- pair production and nonthermal processes in this source.

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