The gamma-ray spectral index changes for blazars

被引：9
|
作者：
Yang JiangHe [1 ,2 ]
Fan JunHui [2 ]
Nie JianJun [1 ]
Yang RuShu [1 ]
机构：
[1] Hunan Univ Arts & Sci, Dept Phys & Elect Sci, Changde 415000, Peoples R China
[2] Guangzhou Univ, Ctr Astrophys, Guangzhou 510405, Guangdong, Peoples R China
来源：
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2012年 / 55卷 / 11期
基金：
中国国家自然科学基金;
关键词：
active galactic nuclei (AGN); blazars; gamma-ray emission; spectral index; ACTIVE GALACTIC NUCLEI; ENERGY COSMIC-RAYS; LOUD BLAZARS; RADIO; DISTRIBUTIONS; VARIABILITY; CATALOG; SAMPLE; POLARIZATION; EMISSIONS;
D O I：
10.1007/s11433-012-4901-8
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Based upon Fermi 1FGL and EGRET 3EG samples, a sample including 79 blazars (53 FSRQs, 26 BL Lacs) is presented. It is investigated that the correlations between the ratio of EGRET to Fermi blazars gamma-ray flux densities and the spectral index differ for EGRET to Fermi blazars for three subclasses of high-frequency peaked BL Lacertae objects-HBL, low-frequency peaked BL Lacertae objects-LBL, and flat spectrum radio quasars-FSRQs. There is a consistent relationship between the ratio of the two gamma-ray flux densities and the spectral index difference for the three subclasses. It suggests that the spectrum changed with the source brightness in the gamma-ray band. Both the spectral index difference and the correlation slopes follow a continuous sequence from FSRQs to LBLs to HBLs, which is consistent with the noted blazar sequence.
引用
收藏
页码：2179 / 2185
页数：7
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