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Comparison between Fermi detected and non-Fermi detected superluminal sources

Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 110-125页

作者： HuBing Xiao JunHui Fan JiangHe Yang Yi Liu YuHai Yuan Jun Tao denise costantin YuTao Zhang ZhiYuan Pei LiXia Zhang WenXin Yang Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Department of Physics and Astronomy University of PadovaPadova PD 35131Italy Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province Guangzhou 510006China Department of Physics and Electronics Science Hunan University of Arts and ScienceChangde 415000China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 210006China

Active galactic nuclei（AGNs） have been attracting research attention due to their special observable properties. Specifically,a majority of AGNs are detected by Fermi-LAT missions, but not by Fermi-LAT, which raises the question of weather any differences exist between the two. To answer this issue, we compile a sample of 291 superluminal AGNs（189 FDSs and 102 nonFDSs） from available multi-wavelength radio, optical, and X-ray（or even γ-ray） data and Doppler factors and proper motion（μ）(or apparent velocity(βapp)); calculated the apparent velocity from their proper motion, Lorentz factor（Γ）, viewing angle（?） and co-moving viewing angle(?co) for the sources with available Doppler factor（δ）; and performed some statistical analyses for both types. Our study indicated that（1） in terms of average values, FDSs have higher proper motions（μ）, apparent velocities(βapp),Doppler factor（δ）, Lorentz factor（Γ）, and smaller viewing angle（?）. Nevertheless, there is no clear difference in co-moving viewing angles（?∞）. The results reveal that FDSs show stronger beaming effect than non-FDSs.（2） In terms of correlations:1) both sources show positive, mutually correlated fluxes, which become closer in de-beamed fluxes; 2) with respect to apparent velocities and γ-ray luminosity, there is a tendency for the brighter sources to have higher velocities; 3) with regard to viewing angle and observed γ-ray luminosity, log? =-（0.23 ± 0.04）log Lγ+（11.14 ± 1.93）, while for the co-moving viewing angle and the intrinsic γ-ray luminosity, log?∞=（0.09 ± 0.01）log Lγn-（1.73 ± 0.48）. These correlations show that the luminous γ-ray sources have smaller viewing angles and a larger co-moving viewing angle, which indicate a stronger beaming effect in γ-ray emissions.

关键词： active galactic nuclei jets γ-rays correlations

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Clustering Algorithm

Clustering Algorithm

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中国天文学会2016年学术年会

作者： denise costantin CFA

＜正＞The past decade has seen a dramatic improvement in the quality of data available at both high（HE,＞10 Ge V）and very high（VHE,＞100 Ge V）gamma-ray *** to the latest Pass8 data release by Fermi LAT which incre...

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