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
Denis Bastieri
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhiyuan Pei;Junhui Fan;Jianghe Yang;Denis Bastieri

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耀变体是具有极端观测特性的活动星系核的一个子类,它是由相对论射流中的光束效应引起的,用多普勒因子 (δ) 表示。多普勒因子是耀变体范式中指示所有观测性质的重要参数,人们提出了许多方法来估计其值。在本文中,我们提出了一种遵循 Mattox 等人的方法。通过采用可用的γ射线和X射线数据,计算809个选定的费米/LAT检测到的γ射线耀变体的γ射线多普勒因子(δγ)的下限。我们的样本包括342个平谱射电类星体(FSRQ)和467个BL Lac天体(BL Lacs),其中507个源是用可用射电编译的我们之前的研究中的核心优势参数(R)。我们的计算表明,FSRQ 和 BL Lacs 的 δγ 下限平均值分别为 δγ |FSRQ = 6.87 ± 4.07 和 δγ |BL Lac = 4.31 ± 2.97。我们将我们的结果与文献中的结果进行比较和讨论。我们发现,对于某些源,得出的 δγ 下限高于无线电估计的下限,这可能是由这些耀变体内的射流弯曲来解释的。我们的结果还表明,γ 射线和射电区域可能具有相同的相对论效应。 γ射线多普勒因子被发现与γ射线光度和核心优势参数相关,这意味着射流可能在γ射线波段是连续的,而R可能是射束效应的指标。
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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发表时间: 2020-06
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影响因子: --
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DOI: 10.3847/1538-4357/ac3a09
发表时间: 2012-10
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影响因子: --
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