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Observations of Seyferts by OSSE and parameters of their X-ray/gamma-ray sources
Andrzej A. Zdziarski, Juri Poutanen, W. Neil Johnson
We present a summary of spectra of Seyfert galaxies observed by the OSSE detector aboard Compton Gamma Ray Observatory. We obtain average spectra of Seyferts of type 1 and 2, and f…
Broad-band X-ray/gamma-ray spectra and binary parameters of GX 339-4 and their astrophysical implications
Andrzej A. Zdziarski, Juri Poutanen, Joanna Mikolajewska +3
We present X-ray/gamma-ray spectra of the binary GX 339-4 observed in the hard state simultaneously by Ginga and CGRO OSSE during an outburst in 1991 September. The Ginga spectra a…
Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry
A. A. Zdziarski, W. N. Johnson, P. Magdziarz
We study gamma-ray observations of NGC 4151 by GRO/OSSE contemporaneous with X-ray observations by ROSAT and Ginga in 1991 June and with ASCA in 1993 May. The spectra are well mode…