The gamma-ray Doppler factor determinations for a Fermi blazar sample  

作　　者：Jun-Hui Fan Jiang-He Yang Yi Liu Jing-Yi Zhang 

机构地区：[1]Center for Astrophysics, Guangzhou University [2]Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province [3]Department of Physics and Electronics Science, Hunan University of Arts and Science

出　　处：《Research in Astronomy and Astrophysics》2013年第3期259-269,共11页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 11173009);the National Basic Research Program of China (973 program, 2007CB815405);the Bureau of Education of Guangzhou Municipality (No.11 Sui-Jiao-Ke[2009]);Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme(GDUPS) (2009);Yangcheng Scholar Funded Scheme (10A027S);the Joint Laboratory for Optical Astronomy of Chinese Academy of Sciences

摘　　要：Observations suggest that γ-ray loud blazars are strongly beamed. The Fermi mission has detected many of blazars, which provide us with a good opportunity to investigate the emission mechanism and the beaming effect in the γ-ray region. We compiled the X-ray observations for 138 Fermi blazars （54 flat spectrum radio quasars, 36 low-peaked BL Lacertae objects, and 48 high-peaked BL Lacertae objects） and calculated their Doppler factors, δγ. It is interesting that the calculated Doppler factors, δγ, are strongly correlated with the γ-ray luminosity.Observations suggest that γ-ray loud blazars are strongly beamed. The Fermi mission has detected many of blazars, which provide us with a good opportunity to investigate the emission mechanism and the beaming effect in the γ-ray region. We compiled the X-ray observations for 138 Fermi blazars （54 flat spectrum radio quasars, 36 low-peaked BL Lacertae objects, and 48 high-peaked BL Lacertae objects） and calculated their Doppler factors, δγ. It is interesting that the calculated Doppler factors, δγ, are strongly correlated with the γ-ray luminosity.

关 键 词：galaxies： active -- galaxies： BL Lacertae objects -- galaxies： quasars --galaxies： jets 

分 类 号：P172.3[天文地球—天文学] P157.7