| Blazar天体中光学射电大爆发的频谱演化 |
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| 引用本文： | 钱善Jie.Blazar天体中光学射电大爆发的频谱演化[J].天文学报,1997,38(3):239-249. |
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| 作者姓名： | 钱善Jie |
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| 作者单位： | 中国科学院北京天文台!北京100080 |
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| 基金项目： | 国家自然科学基金会资助课题 |
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| 摘 要： | 本文讨论Ｂｌａｚａｒ天体中光学射电大爆发频谱演化的理论模型．考虑沿喷流传播的相对论性激波所注入或加速的相对论性电子，受到康普顿、同步辐射和绝热膨胀三种损耗，并计及相对论电子能谱的高能截断．假定喷流轴线与观测者方向构成很小角度．文中给出了大爆发频谱三阶段连续演化的特性，即康普顿阶段，同步辐射阶段和绝热膨胀阶段的爆发特性．频谱演化用（Ｓｍ－ｖｍ）关系表达（见图２，图中Ｓｍ为频谱反转流量，ｖｍ为反转频率），它与一些Ｂｌａｚａｒ天体中观测到的典型形式相符合．
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| 关 键 词： | Blazar天体 光学射电爆发 频谱演化 激波模型 |
A MODEL FOR THE SPECTRAL EVOLUTION OF THE OPTICAL AND RADIO OUTBURSTS IN BLAZARS |
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| Qian Shan-jie.A MODEL FOR THE SPECTRAL EVOLUTION OF THE OPTICAL AND RADIO OUTBURSTS IN BLAZARS[J].Acta Astronomica Sinica,1997,38(3):239-249. |
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| Authors: | Qian Shan-jie |
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| Abstract: | A theoretical model for the spectral evolution of the outbursts in optical and radio wavelength regions from Blazars is discussed. It is considered that the relativistic electrons are injected (or accelerated) by a relativistic shock wave propagating down the jet, the axis of which makes a very small angle with the line of sight. The relativistic electrons experience Compton-, synchro- and adiabatic losses and the high energy cut-off of the electron energy spectrum evolves due to the energy losses. The model shows that the outbursts evolve characteristically through 3-stages: Compton stage,synchrotron stage and adiabatic stage. This behavionr of evolution can be described by the Sm-vm relation (Sm-turn over flux and vm-turn over frequency).The theoretical relation is typical of the ones observed in Blazars (for example, in 3C273) and thus the proposed model can be used to interprete the spectral evolution of optical and radio outbursts of Blazars. The outburst spectra for different epochs and the light curves for different frequencies are also given. |
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| Keywords: | Blazar outburst(optical-radio) spectral evolution shock model |
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