ON THE BREAK IN THE FERMI-LARGE AREA TELESCOPE SPECTRUM OF 3C 454.3

被引：82

作者：

Finke, Justin D. ^{[1
]}

Dermer, Charles D. ^{[1
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 714卷 / 02期

关键词：

gamma rays: galaxies; quasars: individual (3C 454.3); radiation mechanisms: non-thermal; GAMMA-RAY ABSORPTION; MULTIWAVELENGTH OBSERVATIONS; RADIATION-FIELDS; CRAZY-DIAMOND; BLACK-HOLES; QUASARS; BLAZARS; MODEL; VARIABILITY; DISK;

D O I：

10.1088/2041-8205/714/2/L303

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fermi Gamma-ray Space Telescope observations of the flat spectrum radio quasar 3C 454.3 show a spectral-index change Delta Gamma congruent to 1.2 +/- 0.3 at break energy E(br) approximate to 2.4 +/- 0.3 GeV. Such a sharp break is inconsistent with a cooling electron distribution and is poorly fit with a synchrotron self-Compton model. We show that a combination of two components, namely, the Compton-scattered disk and broad-line region (BLR) radiations, explains this spectral break and gives a good fit to the quasi-simultaneous radio, optical/UV, X-ray, and gamma-ray spectral energy distribution observed in 2008 August. A sharp break can be produced independent of the emitting region's distance from the central black hole if the BLR has a gradient in density proportional to R(-2), consistent with a wind model for the BLR.

引用

页码：L303 / L307

页数：5

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