The nature of the γ-ray flare associated with blazar 3C 454.3

被引：5

作者：

Hu, Wen

Fan, Zhong-Hui

Dai, Ben-Zhong ^{[1
]}

机构：

[1] Yunnan Univ, Dept Astron, Kunming 650091, Peoples R China

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2015年 / 15卷 / 09期

基金：

中国国家自然科学基金;

关键词：

radiation mechanisms: non-thermal; methods: numerical; galaxies: active; quasars: individual (3C 454.3); ACTIVE GALACTIC NUCLEI; SPACE-TELESCOPE OBSERVATIONS; DOPPLER FACTORS; RELATIVISTIC JETS; RADIATION-FIELDS; COMPTON ANALYSIS; EMISSION-REGION; LORENTZ FACTORS; VIEWING ANGLES; XMM-NEWTON;

D O I：

10.1088/1674-4527/15/9/002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have studied the simultaneous spectral energy distributions (SEDs) of the 2009 December flare and those of the quiescent state of blazar 3C 454.3 by constructing a multi-component model. We find that all six SEDs can be explained by a one-zone leptonic model involving synchrotron self-Compton (SSC) plus external Compton emission from an accretion disk (ECD) and that from a broad-line region (ECC). X-ray emission is dominated by the SSC mechanism, and the gamma-ray spectrum is well represented by a combination of ECD and ECC processes. Our results indicate that the energy density of the magnetic field and electrons decrease with distance from the central engine, and the Doppler factor increases with the blob moving outward in the development of the 2009 December flare. The increase in the observed flux density is possibly due to the increase in the Doppler factor of the blob. The relation between the Doppler factor delta(b) and the distance from the central black hole suggests the magnetically driven jets span a sub-pc scale, and the relation between the magnetic field B' and the dimension of the emission region R-b' is in good agreement with what is required by conservation of magnetic flux. The weak "harder-when-brighter" behavior of the gamma-ray spectrum could be a result of the increase in Doppler factor during the outward motion of the blob. The parameters during the quiescent state obviously deviate from those during the flare state. We propose that the flare was likely caused by the ejection of a new blob. The gamma-ray emissions in different states are associated with the evolution of the blob.

引用

页码：1455 / 1466

页数：12

共 79 条

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