Fermi耀变体的gamma射线多波段辐射与射电辐射的关系
作者:
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1.湖南文理学院数理学院常德415000;2.广州大学天体物理中心广州510006)

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P157;

基金项目:

国家自然科学基金项目(11733001、U1431112、U1531245、11403006), 广东省自然科学基金项目(2017 A030313011、2019 B030302001), 广东省和广州市天体物理重点学科, 湖南省自然科学基金项目(2015JJ2104), 湖南省教育厅研究基金项目(16C1081、19C1263), 湖南文理学院博士科研启动基金项目(19BSQD38)资助


The Correlations between Radio and gamma-ray Emissions in Multi-bands for Fermi Blazars
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Affiliation:

1. College of Mathematics and Physics Science, Hunan University of Arts and Science, Changde 415000;2. Center for Astrophysics, Guangzhou University, Guangzhou 510006;

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    摘要:

    从Fermi 3期源表(3FGL)中选择了一个含935个耀变体(blazar)的样本, 包括415个平谱射电源(Flat Spectrum Radio Quasar, FSRQ), 520个蝎虎天体(BL Lac object, BL Lac), 其中高同步峰BL Lac (HBL) 233个, 中同步峰BL Lac (IBL) 144个, 低同步峰BL Lac (LBL) 143个. 研究了总样本、FSRQ、BL Lac及其子类HBL、LBL的射电1.4GHz 与gamma射线在0.1、0.3、1、3、10GeV处辐射流量密度的关系. 结果显示: 所有样本的射电1.4GHz与5个波段gamma射线的辐射流量都有强相关, 相关系数在0.48--0.81之间, 机会概率均小于$10^{-4; 对于不同的样本相关系数随着gamma射线辐射频率的变化有不同的变化趋势, 所有样本在5个波段的相关系数平均值随gamma射线频率的增加而减小. 该结果暗示, 随着频率的升高, blazar的gamma射线辐射主导机制在发生变化, 在相同频率处, 不同类型天体的辐射主导机制存在差异; HBL的gamma射线辐射主要由同步自康普顿主导, 而LBL的其他成份比HBL的更复杂; FSRQ的gamma射线起源较BL Lac的复杂.

    Abstract:

    A sample including 935 blazars with 415 Flat Spectrum Radio Quasars (FSRQs) and 520 BL Lac objects (BL Lacs) (233 HBLs (High synchrotron peak frequency BL Lacs), 144 IBLs (Intermediate synchrotron peak frequency BL Lacs), and 143 LBLs (Low synchrotron peak frequency BL Lacs)) is selected in Fermi 3FGL catalogue. The correlations between two flux densities of the radio 1.4GHz and gamma-ray at 0.1, 0.3, 1, 3, and 10GeV are investigated for the samples of all blazars, FSRQs, BL Lacs, and subclasses of HBLs and LBLs, respectively. Results show that there are strong positive correlations between the two flux densities, with the correlation coefficients r = 0.48--0.81 and the chance probabilities p all less than 10-4; The correlation coefficient has different trends with the change of gamma-ray emission frequency for different blazar samples, and the average correlation coefficients for all samples at the five respective bands decrease with the increase of gamma-ray frequency. Therefore, with the increase of gamma-ray frequency, the dominant mechanism of gamma-ray radiation of blazar is changing, and at the same frequency the dominant mechanism is different for different samples. The gamma-ray emission of HBLs may be mainly dominated by the synchrotron self-Compton, while the other mechanisms are responsible for the gamma-ray emissions of LBLs. The origin of gamma-ray in FSRQs is more complex than that of BL Lacs.

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庹满先,邓进杰,杨江河,张月莲,陈秀慧,汪胜辉,曲孝海,聂建军,樊军辉.Fermi耀变体的gamma射线多波段辐射与射电辐射的关系[J].天文学报,2020,(3):13-44.

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  • 收稿日期:2019-09-09
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  • 在线发布日期: 2020-06-02
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