Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l..93z&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L93-L96.
Astronomy and Astrophysics
Astronomy
51
Astronomical Satellites, Electron Acceleration, Gamma Ray Astronomy, Seyfert Galaxies, Spaceborne Astronomy, Astronomical Models, Electron Energy, Relativistic Electron Beams
Scientific paper
We show that the recent observations of the Seyfert galaxy NGC 4151 in hard X-rays and soft gamma rays by the OSSE and SIGMA detectors on board CGRO and GRANAT, respectively, are well explained by a nonthermal model with acceleration of relativistic electrons at an efficiency of less than 50 percent and with the remaining power dissipated thermally in the source (the standard nonthermal e(+/-) pair model assumed 100 percent efficiency). Such an acceleration efficiency is generally expected on physical grounds. The resulting model unifies previously proposed purely thermal and purely nonthermal models. The pure nonthermal model for NGC 4151 appears to be ruled out. The pure thermal model gives a worse fit to the data than our hybrid nonthermal/thermal model.
Lightman Alan P.
Maciolek-Niedzwiecki Andrzej
Zdziarski Andrzej A.
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