Lorentz factor estimation for radio sources  

作　　者：YANG JiangHe FAN JunHui YUAN YuHai 

机构地区：[1]Department of Physics and Electronics Science, Hunan University of Arts and Science, Changde 415000, China [2]Center for Astrophysics, Guangzhou University, Guangzhou 510006, China [3]Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province, Guangzhou 510006, China [4] Laboratory Center, Guangzhou University, Guangzhou 510006, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第8期1510-1514,共5页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10633010 and 11173009);the National Basic Research Program of China (Grant No. 2007CB 815405);the Bureau of Education of Guangzhou Municipality (Grant No. 11 Sui-Jiao-Ke[2009]);Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme(GDUPS) (2009), Yangcheng Scholar Funded Scheme (Grant No.10A027S);Hunan Provincial Natural Science Foundation of China (Grant No. 10JJ3020);the Fund of the 11th Five-year Plan for Key Construction Academic Subject (Optics) of Hunan Province;the research fund of Hunan University of Arts and Science (Grant No. JJZD201101)

摘　　要：In this paper, a sample including 68 blazars (18 BL Lacs and 50 FSRQs) with known Doppler factors and superluminal velocity from our previous papers is presented. Both the Lorentz factors (/') and viewing angles (0) are estimated for the 68 sources The relationship between BL Lacs and FSRQs is also revisited using the two variables off'and 0. The Lorenz factors are in the range of 2.33 to 64.07. The viewing angles are in the range of 0.04 to 24.56. The averaged value of the viewing angle for BL Lacs is slightly larger than that for FSRQs, while the averaged value of the Lorentz factor for BL Lacs is smaller than that for FSRQs.In this paper, a sample including 68 blazars (18 BL Lacs and 50 FSRQs) with known Doppler factors and superluminal velocity from our previous papers is presented. Both the Lorentz factors (Γ) and viewing angles (θ) are estimated for the 68 sources. The relationship between BL Lacs and FSRQs is also revisited using the two variables of Γ and θ. The Lorenz factors are in the range of 2.33 to 64.07. The viewing angles are in the range of 0.04 to 24.56. The averaged value of the viewing angle for BL Lacs is slightly larger than that for FSRQs, while the averaged value of the Lorentz factor for BL Lacs is smaller than that for FSRQs.

关 键 词：radio sources Lorentz factor viewing angle 

分 类 号：P157.6[天文地球—天文学]