相对论光束对高亮度射电源统一模型的贡献

IF 1.6 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Evaristus U. Iyida, Emmanuel Proven-Adzri, Diana Y. Klutse, Theophilus Ansah-Narh
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引用次数: 0

摘要

在这项研究中,我们应用\(\gamma \)射线发射的双分量模型来评估高亮度射电源统一方案的有效性,特别是Fanaroff-Riley II型射电星系(FR IIs)和平谱射电类星体(FSRQs)。我们分析了一个由费米大面积望远镜(Fermi- lat)探测到的220个fsrq和107个非费米探测到的fsrq组成的综合数据集。利用相对论光束的概念,我们计算了延伸和岩心\(\gamma \)射线发射,并使用\(\gamma \)射线光束因子(\(g_\gamma (\beta , \psi )\))来估计\(\gamma \)射线岩心优势。主要研究结果如下:(1)FSRQs的无线电(\(R_r\))和\(\gamma \) -射线(\(R_\gamma \))核心优势度参数(对数尺度)分别为- 2.40 ~ 4.32和- 1.63 ~ 9.73,平均值分别为1.36和2.52。相比之下,对于FR ii, \(R_r\)和\(R_\gamma \)的范围分别为- 3.30至0.27和- 1.82至3.79,平均值分别为0.16和0.23。与fsrq相比,FR ii的核心优势度明显较低,这支持了统一模型,其中FR ii代表fsrq的错位对应物。(2) \(\gamma \) -射线辐射在FSRQs中以地核为主,超过了扩展区的贡献约3个数量级。\(R_r\)、\(R_\gamma \)及其各自发射分量之间的强反相关进一步表明,\(\gamma \)射线的产生在很大程度上受到相对论光束效应的影响。(3) FR i在\(R_r\)和\(R_\gamma \) vs. \(\gamma \)射线发射参数空间中的分布表明,不同区域存在不同的光束效应。这些发现表明,在FSRQs中\(\gamma \) -射线发射主要来自核心,并揭示了相对论光束效应对FSRQs和FR ii高亮度样品统一模型的贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Contributions of relativistic beaming to the unified model of high-luminosity radio sources

In this study, we apply the dual-component model of \(\gamma \)-ray emission to assess the validity of the unified scheme for high-luminosity radio sources, specifically, Fanaroff–Riley Type II radio galaxies (FR IIs) and Flat-Spectrum Radio Quasars (FSRQs). We analyse a combined dataset comprising 220 FSRQs detected by the Fermi Large Area Telescope (Fermi-LAT) and 107 non-Fermi detected FR IIs. Utilizing the concept of relativistic beaming, we compute both the extended and core \(\gamma \)-ray emissions and used the \(\gamma \)-ray beaming factor (\(g_\gamma (\beta , \psi )\)) to estimate the \(\gamma \)-ray core-dominance. Our main findings are as follows: (1) Radio (\(R_r\)) and \(\gamma \)-ray (\(R_\gamma \)) core-dominance parameters (in logarithmic scale) range from −2.40 to 4.32 and −1.63 to 9.73, respectively, for FSRQs, with mean values of 1.36 and 2.52. In contrast, for FR IIs, \(R_r\) and \(R_\gamma \) span −3.30 to 0.27 and −1.82 to 3.79, with mean values of 0.16 and 0.23, respectively. The significantly lower core-dominance of FR IIs compared to FSRQs, supports the unified model, wherein FR IIs represent the misaligned counterparts of FSRQs. (2) \(\gamma \)-ray emission in FSRQs is predominantly core-dominated, exceeding the contribution from the extended region by approximately three orders of magnitude. Strong anti-correlations between \(R_r\), \(R_\gamma \) and their respective emission components further indicate that \(\gamma \)-ray production is substantially influenced by relativistic beaming effects. (3) Distribution of FR IIs in the parameter space of \(R_r\) and \(R_\gamma \) vs. \(\gamma \)-ray emission suggests the presence of varying beaming effects across different regions. These findings indicate that \(\gamma \)-ray emission in FSRQs originates primarily from the core and reveals the contributions of relativistic beaming effect to the unified model of high luminosity samples of FSRQs and FR IIs.

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来源期刊
Journal of Astrophysics and Astronomy
Journal of Astrophysics and Astronomy 地学天文-天文与天体物理
CiteScore
1.80
自引率
9.10%
发文量
84
审稿时长
>12 weeks
期刊介绍: The journal publishes original research papers on all aspects of astrophysics and astronomy, including instrumentation, laboratory astrophysics, and cosmology. Critical reviews of topical fields are also published. Articles submitted as letters will be considered.
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