Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407l..61m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 407, no. 2, p. L61-L64.
Astronomy and Astrophysics
Astrophysics
96
Gamma Ray Observatory, Seyfert Galaxies, Active Galactic Nuclei, Compton Effect, Spectral Line Width
Scientific paper
Observations of the Seyfert galaxy NGC 4151 with the Oriented Scintillation Spectrometer Experiment instrument on the Compton Gamma Ray Observatory are presented. A continuum spectrum is observed, which steepens exponentially with an e-folding energy of 39 +/- 2 keV over the 65-300 keV range. Source intensity variability of approximately 25 percent was seen during the observations, and no significant change in the spectral shape was detected. Simple pair models cannot explain the observed spectrum of NGC 4151, and repeated observations are required to determine whether this spectral shape is common or is even the dominant spectral state in this class of active galactic nuclei.
Cameron Robert A.
Grabelsky David Andrew
Johnson Neil W.
Jung Gregory V.
Kinzer Robert L.
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