BL Lac天体的谱性质

The Spectral Properties of BL Lac Objects

研究了等离子体反应堆模型，统一解释活动星系核的辐射性质，特别是ＢＬＬａｃ天体的谱性质．具体的物理过程是:大量相对论电子从中心天体注入周围的等离子体反应堆中，通过同步辐射快速损失能量，同时这些电子同步吸收反应堆中不透明的光子，产生一个稳定、各向同性的幂律分布，其谱指数为γ＝３；然后，这些相对论电子通过等离子体反应堆的爆发或其表面扩散过程逃逸出来，产生低频的同步辐射；来自等离子体反应堆的高频辐射表现出快速的谱变化，即流量减小时谱变陡．另外，还详细分析了具有辐射损失和相对论电子注入的同步辐射源的性质．

model of plasma reactor is examined for a unified interpretation of the radiationof active galactic nuclei and, particularly, of BL Lac objects. The physical scenario is asfollows: a large number of relativistic electrons are ejected by the central engine into theplasma reactor which surrounds the central core, and rapidly lose their energy by synchrotronradiation. Meanwhile, these electrons are accelerated by absorbing synchrotron radiationwhich is not transparent in the plasma reactor and set up a steady and isotropic powerlaw distribution with spectral index γ=3. Then they emerge through surface diffusion oroutburst of the plasma reactor and generate low-frequency synchrotron radiation. The higherfrequency synchrotron radiation produced by the plasma reactor shows a rapid spectralsteeping as the flux decreases. The properties of synchrotron radiation source with radiationloss and injection of relativistic electrons are studied in detail.