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High energy continuum measurements of active galactic nucleiWe review recent hard X-ray and gamma-ray observations of Cen A, NGC 4151, 3C273, and 3C279. The new data showed remarkable variability of these objects in the high-energy gamma-ray regime. Recent observations by GRANAT show an unexpected sharp break at about 50 keV in the 1990 spectrum of NGC 4151. Recent observations by the Compton Observatory show intense GeV emission from 3C279 in June 1991. We present composite energy spectra of these objects from the radio to gamma-ray energies.
Document ID
19930045856
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gehrels, Neil (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cheung, Cynthia (BDM International, Inc. Columbia, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oct. 14-16, 1991 (A93-29801 11-90)
Publisher: American Institute of Physics
Subject Category
Astrophysics
Accession Number
93A29853
Distribution Limits
Public
Copyright
Other

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