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EGRET detection of high-energy gamma radiation from the OVV quasar 3C 454.3High-energy gamma radiation has been observed from the optically violent variable quasar 3C 454.3 (PKS 2251 + 158) by the Energetic Gamma-Ray Experiment Telescope on the Compton Observatory. During the 1992 January-February observation, the emission showed a power-law photon spectrum with an exponent of -2.18 +/- 0.08. The flux density (greater than 100 MeV) was observed to vary within the range (0.4-1.4) x 10 exp -6 photon/sq cm s on a time scale of less than a week. Lower sensitivity observations during 1992 April and May also detected emission within that range, but with lower statistical significance. An earlier low-sensitivity exposure during 1991 August gave a 95 percent confidence upper limit of 0.26 x 10 exp 6 photon/sq cm s. The similarity of the gamma-ray emission of 3C 454.3 to that of 3C 279 parallels the similarity of these two objects at lower frequencies.
Document ID
19930051774
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hartman, R. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bertsch, D. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dingus, B. L.
(NASA Goddard Space Flight Center; Universities Space Research Association, Greenbelt, MD, United States)
Fichtel, C. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hunter, S. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kanbach, G.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Kniffen, D. A.
(Universities Space Research Association, Greenbelt, MD; Hampden-Sydney College VA, United States)
Lin, Y. C.
(Stanford Univ. CA, United States)
Mattox, J. R.
(NASA Goddard Space Flight Center; Compton Observatory Greenbelt, MD, United States)
Mayer-Hasselwander, H. A.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Date Acquired
August 16, 2013
Publication Date
April 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 407
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A35771
Funding Number(s)
CONTRACT_GRANT: NAS5-31210
CONTRACT_GRANT: BMFT-50-QV-9095
CONTRACT_GRANT: NAG5-1605
CONTRACT_GRANT: NAG5-1742
Distribution Limits
Public
Copyright
Other

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