4 papers
Gamma-Ray Spectral States of Galactic Black Hole Candidates
J. E. Grove, W. N. Johnson, R. A. Kroeger +3
OSSE has observed seven transient black hole candidates: GRO J0422+32, GX339-4, GRS 1716-249, GRS 1009-45, 4U 1543-47, GRO J1655-40, and GRS 1915+105. Two gamma-ray spectral states…
Multiwavelength Observations of a Dramatic High Energy Flare in the Blazar 3C 279
A. E. Wehrle, E. Pian, C. M. Urry +3
The blazar 3C 279, one of the brightest identified extragalactic objects in the gamma-ray sky, underwent a flare of a factor 10 amplitude in gamma-rays towards the end of a 3-week…
OSSE Observations of the Ultraluminous Infrared Galaxies Arp 220, Mrk 273 and Mrk 231
C. D. Dermer, J. Bland-Hawthorn, J. Chiang +1
We report results of soft gamma-ray observations of the ultraluminous infrared galaxies Arp 220, Mrk 273, and Mrk 231 in order to test whether the infrared radiation from these sou…
The average X-ray/gamma-ray spectrum of radio-quiet Seyfert 1s
D. Gondek, A. A. Zdziarski, W. N. Johnson +5
We have obtained the average 1--500 keV spectrum of radio-quiet Seyfert 1s using data from EXOSAT, Ginga, HEAO, and GRO/OSSE. The spectral fit to the combined average EXOSAT and OS…