Acceleration efficiency in nonthermal sources and the soft gamma rays from NGC 4151 observed by OSSE and SIGMA
1993; IOP Publishing; Volume: 414; Linguagem: Inglês
10.1086/187004
ISSN1538-4357
AutoresA. A. Zdziarski, Alan P. Lightman, A. Niedźwiecki,
Tópico(s)Astronomy and Astrophysical Research
Resumoview Abstract Citations (67) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Acceleration Efficiency in Nonthermal Sources and the Soft Gamma Rays from NGC 4151 Observed by OSSE and SIGMA Zdziarski, Andrzej A. ; Lightman, Alan P. ; Maciolek-Niedzwiecki, Andrzej Abstract We show that the recent observations of the Seyfert galaxy NGC 4151 in hard X-rays and soft γ-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 <~ 50% and with the remaining power dissipated thermally in the source (the standard nonthermal e^+/- pair model assumed 100% 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. Publication: The Astrophysical Journal Pub Date: September 1993 DOI: 10.1086/187004 Bibcode: 1993ApJ...414L..93Z Keywords: Astronomical Satellites; Electron Acceleration; Gamma Ray Astronomy; Seyfert Galaxies; Spaceborne Astronomy; Astronomical Models; Electron Energy; Relativistic Electron Beams; Astrophysics; ACCELERATION OF PARTICLES; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4151; GALAXIES: SEYFERT; RADIATION MECHANISMS: MISCELLANEOUS; X-RAYS: GALAXIES full text sources ADS | data products SIMBAD (1) NED (1) HEASARC (1)
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