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arXiv 1607.02663astro-ph.HE
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平谱射电类星体与GeV窄线Seyfert 1星系喷流辐射的相似性:通用的$δ$ - $L_{\rm c}$关联

Similarity of Jet Radiation between Flat Spectrum Radio Quasars and GeV Narrow-Line Seyfert 1 Galaxies: A Universal $δ$-$L_{\rm c}$ Correlation

Yong-Kai Zhu, Jin Zhang, Hai-Ming Zhang, En-Wei Liang, Da-Hai Yan, Wei Cui, Shuang-Nan Zhang

摘要:

通过对典型平谱射电类星体宽带谱能量分布的模拟,(FSRQ,3C 279)和两个GeV窄线Seyfert 1星系(NLS 1 s,PMN J 0948 +0022和1H 0323+342)在不同通量阶段的单带轻子模型,我们发现它们的多普勒因子($δ$)和外康普顿散射凸起的峰值亮度($L_{\rm c}$)之间存在普遍的相关性。通过对FSRQ和GeV NLS 1的组合样本的编译,发现不同阶段和不同来源的FSRQ和GeV NLS 1都很好地遵循了相同的$δ$ - $L_{\rm c}$相关。这表明,观测到的光度的变化可能主要是由于多普勒增强效应。FSRQs和GeV NLS 1在不同阶段的普适$δ$ - $L_{\rm c}$关系可能进一步证明了两种源的粒子加速和辐射机制是相似的。此外,通过用费米/LAT带中观测到的光度($L_{\rm LAT}$)代替$L_{\rm c}$,这种相关性成立,并且它可以作为$δ$的经验指标。我们用$L_{\rm LAT}$对Fermi/LAT星表中的484个FSRQ进行了$δ$值的估计,其范围为3 ~ 41,中位数为16,这与其他方法得到的结果在统计上是一致的。

英文摘要:

By modeling the broadband spectral energy distributions (SEDs) of a typical flat spectrum radio quasar (FSRQ, 3C 279) and two GeV narrow-line Seyfert 1 galaxies (NLS1s, PMN J0948+0022 and 1H 0323+342) in different flux stages with the one-zone leptonic models, we find a universal correlation between their Doppler factors ($δ$) and peak luminosities ($L_{\rm c}$) of external Compton scattering bumps. Compiling a combined sample of FSRQs and GeV NLS1s, it is found that both FSRQs and GeV NLS1s in different stages and in different sources well follow the same $δ$-$L_{\rm c}$ correlation. This indicates that the variations of observed luminosities may be essentially due to the Doppler boosting effect. And the universal $δ$-$L_{\rm c}$ relation between FSRQs and GeV NLS1s in different stages may be further evidence that the particle acceleration and radiation mechanisms for the two kinds of sources are similar. In addition, by replacing $L_{\rm c}$ with the observed luminosity in the Fermi/LAT band ($L_{\rm LAT}$), this correlation holds, and it may serve as an empirical indicator of $δ$. We estimate the $δ$ values with $L_{\rm LAT}$ for 484 FSRQs in the Fermi/LAT Catalog and they range from 3 to 41, with a median of 16, which are statistically consistent with the values derived by other methods.

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