The estimation of γ-ray Doppler factor for Fermi/LAT-detected blazars
The estimation of γ-ray Doppler factor for Fermi/LAT-detected blazars
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费米/LAT 检测的耀变体的 γ 射线多普勒因子的估计
DOI:
10.1017/pasa.2020
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发表时间:
2020-08
影响因子:
6.3
通讯作者:
Denis Bastieri
中科院分区:
文献类型:
--
作者:
Zhiyuan Pei;Junhui Fan;Jianghe Yang;Denis Bastieri
Blazars are a subclass of active galactic nuclei with extreme observation properties, which is caused by the beaming effect, expressed by a.Doppler factor (δ), in a relativistic jet. Doppler factor is an important parameter in the blazars paradigm to indicate all of the observation.properties, and many methods were proposed to estimate its value. In this paper, we present a method following Mattox et al. to calculate the.lower limit on γ-ray Doppler factor (δγ ) for 809 selected Fermi/LAT-detected γ-ray blazars by adopting the available γ-ray and X-ray data..Our sample included 342 flat-spectrum radio quasars (FSRQs) and 467 BL Lac objects (BL Lacs), out of which 507 sources are compiled with.available radio core-dominance parameter (R) from our previous study. Our calculation shows that the average values of the lower limit on.δγ for FSRQs and BL Lacs are δγ |FSRQ = 6.87 ± 4.07 and δγ |BL Lac = 4.31 ± 2.97, respectively. We compare and discuss our results with.those from the literature. We found that the derived lower limit on δγ for some sources is higher than that from the radio estimation, which.could be possibly explained by the jet bending within those blazars. Our results also suggest that the γ-ray and radio regions perhaps share.the same relativistic effects. The γ-ray Doppler factor has been found to be correlated with both the γ-ray luminosity and core-dominance.parameter, implying that the jet is possibly continuous in the γ-ray bands, and R is perhaps an indicator for a beaming effect.
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DOI:
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发表时间:
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DOI:
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DOI:
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DOI:
10.1007/s11433-019-1454-6
发表时间:
2019-05
期刊:
Science China Physics, Mechanics & Astronomy
影响因子:
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作者:
ZhiYuan Pei;JunHui Fan;Denis Bastieri;JiangHe Yang;HuBing Xiao
通讯作者:
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DOI:
10.3847/1538-4357/ac3a09
发表时间:
2012-10
期刊:
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