The Relativistic Jet and Central Engine of Fermi Blazars

被引:22
作者
Xiao, Hubing [1 ]
Ouyang, Zhihao [2 ]
Zhang, Lixia [3 ,4 ,5 ]
Fu, Liping [1 ]
Zhang, Shaohua [1 ]
Zeng, Xiangtao [3 ,4 ,5 ]
Fan, Junhui [3 ,4 ,5 ]
机构
[1] Shanghai Normal Univ, Shanghai Key Lab Astrophys, Shanghai 200234, Peoples R China
[2] Guangzhou Univ, Sch Phys & Mat Sci, Guangzhou 510006, Peoples R China
[3] Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China
[4] Key Lab Astron Observat & Technol Guangzhou, Guangzhou 510006, Peoples R China
[5] Dept Educ Guangdong Prov, Astron Sci & Technol Res Lab, Guangzhou 510006, Peoples R China
基金
上海市自然科学基金; 中国国家自然科学基金;
关键词
BL LACERTAE OBJECTS; BLACK-HOLE MASS; ACTIVE GALACTIC NUCLEI; DOPPLER FACTOR; QUASARS; LUMINOSITY; POLARIZATION; ACCRETION; POWER; SIZE;
D O I
10.3847/1538-4357/ac36da
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The origin of jets is one of the most important issues concerning active galactic nuclei, yet it has remained obscure. In this work, we made use of information from emission lines, spectral energy distributions, and Fermi-LAT gamma-ray emission to construct a blazar sample that contains 667 sources. We note that jet power originations are different for BL Lacertae objects (BL Lacs) and flat-spectrum radio quasars (FSRQs). The correlation between jet power P-jet and the normalized disk luminosity L-Disk/L-Edd shows a slope of -1.77 for BL Lacs and a slope of 1.16 for FSRQs. The results seem to suggest that BL Lac jets are powered by extracting black hole (BH) rotation energy, while FSRQ jets are mostly powered by accretion disks. Meanwhile, we find the accretion ratio (M) over dot/(M) over dot(Edd) increases with the normalized gamma-ray luminosity. Based on this, we propose a dividing line, log(L-BLR/L-Edd) = 0.25 log(L-gamma/L-Edd) - 2.23, to separate FSRQs and BL Lacs in the diagram of L-BLR/L-Edd against L-gamma/L-Edd using a machine-learning method; the method gives an accuracy of 84.5%. In addition, we propose an empirical formula, M-BH/M-circle dot similar or equal to L-gamma(0.65)/21.46, to estimate BH mass based on a strong correlation between gamma-ray luminosity and BH mass. Strong-ray emission is typical in blazars, and the emission is always boosted by a Doppler-beaming effect. In this work, we generate a new method to estimate a lower limit of Doppler factor delta and give delta(BL Lac) = 7.94 and delta(FSRQ) = 11.55.
引用
收藏
页数:9
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