Two-component model of the X-ray emissions for Fermi $\mathit {Fermi}$ -LAT selected blazars
Two-component model of the X-ray emissions for Fermi $\mathit {Fermi}$ -LAT selected blazars
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DOI：
10.1007/s10509-022-04064-3
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发表时间：
2022-03
影响因子：
1.9
通讯作者：
Xiang-Ming Zeng;Zhuang Zhang;Z. Pei;H. Xiao;Junhui Fan
中科院分区：
文献类型：
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作者：
Xiang-Ming Zeng;Zhuang Zhang;Z. Pei;H. Xiao;Junhui Fan
在双分量模式中，观测到的总排放是两个贡献的总和，即有束和无束。由于光束效应，观测到的相对论性射流的光束发射被强烈增强，而观测到的非光束发射与共动坐标系中的相同。在x射线波段，很难从观测中分离出有光束和无光束的发射。然而，像在Kembhavi （Mon. Not）中那样，应用双组分模型来研究x射线辐射是很有趣的。r·阿斯特朗。Soc. 264:683,)。本文收集了397个blazar的x射线数据和射电核心优势参数，采用Kembhavi等人提出的方法分离了两者在x射线发射中的成分，并讨论了BL Lac天体与FSRQs的区别。结果表明：(1)束流辐射主导x射线辐射。(2) BL Lacertae天体的平均x射线核心优势参数大于FSRQs。(3)获得了x射线光谱指数与x射线核心优势参数的相关性，支持了BL Lac天体、FR I型星系和FR II型星系形态的统一方案，FSRQs与FR 2型类星体的统一方案。
In a two-component model, the total observed emissions are the sum of two contributions, namely a beamed one and an unbeamed one. The observed beamed emissions from a relativistic jet are strongly boosted due to the beaming effect while the observed unbeamed emissions are the same as that in the co-moving frame. In the X-ay band, it is hard to separate the beamed and the unbeamed emissions from observations. However, it is interesting to investigate the X-ray emissions applying the two-component model as in Kembhavi (Mon. Not. R. Astron. Soc. 264:683, ). In this work, a sample of 397 blazars with available X-ray data and radio core-dominance parameters are compiled and the method proposed by Kembhavi et al is adopted to separate the two components in the X-ray emissions, then we also discuss the difference between BL Lac objects and FSRQs. Our results show that: (1) The beamed emissions dominate the X-ray emissions. (2) The averaged X-ray core-dominance parameter in BL Lacertae objects is greater than that in FSRQs. (3) A correlation between X-ray spectral index and X-ray core-dominance parameter is obtained, which supports the unified scheme of BL Lac objects, FR type I galaxies and FR type II with galaxy morphology, FSRQs unified with FR type two quasars.