平谱射电类星体在逆康普顿机制中软光子来源的研究  

Study on the Origin of Soft Photons for the Inverse ComptonMechanism in Flat-spectrum Radio Quasars

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作  者:刘小鹏 王泽睿 杜雷鸣[1] 谢照华[1] 徐云冰[1] 邓雪娇 李海凤 Liu Xiaopeng;Wang Zerui;Du Leiming;Xie Zhaohua;Xu Yunbing;Deng Xuejiao;Li Haifeng(School of Physics and Electronic Information,Yunnan Normal University,Kunming 650500,China;School of Astronomy&Space Science,Nanjing University,Nanjing 210093,China)

机构地区:[1]云南师范大学物理与电子信息学院,云南昆明650500 [2]南京大学天文与空间科学学院,江苏南京210093

出  处:《天文研究与技术》2021年第4期445-455,共11页Astronomical Research & Technology

基  金:国家自然科学基金(U1431123,10973034)资助.

摘  要:为了验证逆康普顿机制的主导过程以及主导过程中软光子的起源,通过文献收集了75个平谱射电类星体(Flat-Spectrum Radio Quasar,FSRQ)多波段的(准)同时数据,并利用对数抛物线函数拟合了频谱能量分布,分析同步峰流量与逆康普顿峰之比和多普勒因子的关系,运用自举法(Bootstrapping)计算了样本的种子因子(Seed Factor,SF)分布,用于调查软光子的起源。分析结果如下:(1)在轻子模型框架下,整个样本与子样本log[U B(νFν)EC/U ext(νFν)syn]和logδ的显著相关性表明,平谱射电类星体的高能辐射优先由外康普顿过程主导。(2)对于相对低同步峰的峰频种群,观测的种子因子分布与理论上尘埃环(Dust Torus,DT)的种子因子范围相交,表明逆康普顿过程中的软光子很可能由尘埃环主导;而对于相对高同步峰的峰频种群,观测的种子因子超过了宽线区(Broad-Line Region,BLR)或尘埃环种子因子的范围,因此无法确定软光子的来源。To verify dominating processes in the inverse Compton mechanism and the origin of soft photons in the dominating processes,we collected multi-wavelength(quasi-)simultaneity data of 75 flat-spectrum radio quasars from the literature.We fitted the spectral energy distribution using logarithmic parabolic functions,then analyzed three correlations for the whole sample,the subsamples of two bins,respectively.The research results are summarized as follows.(1)We find significant correlations of log[U B(νFν)EC/U ext(νFν)syn]and logδfor the whole sample and subsamples of two bins,respectively.Our results show that the inverse Compton mechanism of the flat-spectrum radio quasar is preferentially dominant by the external Compton process under the leptonic model.(2)Based on the Bootstrap to calculate observed seed factor distribution,we apply this method to constrain the origin of soft photons of the dominant process of inverse Compton mechanism.The observed seed factor distribution suggests that soft photons are likely to be dominated by dust torus for populations with relatively low synchrotron peak frequencies.But,we cannot determine the origin of soft photons of the dominant process of inverse Compton mechanism for populations with relatively high synchrotron peak frequencies.

关 键 词:辐射机制 活动星系核 平谱射电类星体 逆康普顿散射 

分 类 号:P157.6[天文地球—天文学]

 

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