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Detection of high-energy gamma rays from quasar PKS 0528 + 134 by EGRET on the Compton Gamma Ray ObservatoryThe first several pointing directions of the Compton Gamma Ray Observatory, launched on 1991 April 5, were toward the Galactic anticenter. In addition to the known gamma-ray sources, Crab and Geminga, high-energy gamma-ray emission was observed from the quasar PKS 0528 + 134 by the Energetic Gamma Ray Experiment Telescope (EGRET). A redshift measurement, reported here, of 2.07 confirms the identification of this object as a quasar. The differential photon spectrum is well represented by a power law with an exponent of 2.56 +/- 0.09 and a photon intensity above 100 MeV of (8.4 +/- 1.0) x 10 exp -7 photons sq cm/s. There is evidence for time variability on a time scale of a few days.
Document ID
19930053240
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hunter, S. D.
(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)
Hartman, R. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kanbach, G.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Kniffen, D. A.
(Hampden-Sydney College VA, United States)
Kwok, P. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lin, Y. C.
(Stanford Univ. CA, United States)
Mattox, J. R.
(NASA Goddard Space Flight Center; Compton Science Support Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
May 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 409
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A37237
Funding Number(s)
CONTRACT_GRANT: NAG5-1742
CONTRACT_GRANT: NAS5-31210
CONTRACT_GRANT: NAG5-1605
CONTRACT_GRANT: BMFT-50-QV-9095
Distribution Limits
Public
Copyright
Other

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