GAMMA-RAY BLAZARS NEAR EQUIPARTITION AND THE ORIGIN OF THE GeV SPECTRAL BREAK IN 3C 454.3

被引：58
作者：
Cerruti, Matteo [1 ,2 ]
Dermer, Charles D. [3 ]
Lott, Benoit [4 ]
Boisson, Catherine [2 ]
Zech, Andreas [2 ]
机构：
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Univ Paris Diderot, CNRS, LUTII, Observ Paris, F-92190 Meudon, France
[3] US Naval Res Lab, Div Space Sci, Washington, DC 20375 USA
[4] Univ Bordeaux, CENBG, IN2P3, CNRS,UMR 7595, F-33175 Gradignan, France
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 771卷 / 01期
关键词：
galaxies: active; galaxies: individual: 3C454.3; gamma rays: general; radiation mechanisms: non-thermal; ACTIVE GALACTIC NUCLEI; LARGE-AREA TELESCOPE; MULTIWAVELENGTH OBSERVATIONS; RADIO QUASARS; AGILE DETECTION; 2010; NOVEMBER; 3C-454.3; OUTBURST; EMISSION; CAMPAIGN;
D O I：
10.1088/2041-8205/771/1/L4
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Observations performed with the Fermi-LAT telescope have revealed the presence of a spectral break in the GeV spectrum of flat-spectrum radio quasars (FSRQs) and other low-and intermediate-synchrotron peaked blazars. We propose that this feature can be explained by Compton scattering of broad-line region photons by a non-thermal population of electrons described by a log-parabolic function. We consider in particular a scenario in which the energy densities of particles, magnetic field, and soft photons in the emitting region are close to equipartition. We show that this model can satisfactorily account for the overall spectral energy distribution of the FSRQ 3C 454.3, reproducing the GeV spectral cutoff due to Klein-Nishina effects and a curving electron distribution.
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页数：5
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