OSSE Observations of Seyfert AGN

Details OSSE Observations of Seyfert AGN OSSE Observations of Seyfert AGN

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.6403j&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #64.03; Bulletin of the American Astronomical Society, Vol. 25, p.1390

Astronomy and Astrophysics

Astronomy

Scientific paper

In the first two years of the Compton Gamma Ray Observatory mission, the Oriented Scintillation Spectrometer Experiment (OSSE) has observed about two dozen Seyfert active galactic nuclei (AGN) selected from the HEAO-1 list (Rothschild et al. 1983) and intense X-ray sources detected by EXOSAT and Ginga. The OSSE observations in the 50 keV - 10 MeV range indicate spectra which, on average, are significantly softer than the power law photon index of Gamma =1.7 which is generally reported in the Xray band. The average spectrum is well described by exponential or thermal Comptonization models indicating a break in the spectrum near 100 keV. We summarize the OSSE observations of AGN and present the average Seyfert spectrum above 50 keV. Rothschild, R.E., et al. 1983, Ap. J., 269, 423.

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