耀变体喷流内电子能谱形成和高能辐射机制研究

The different electronic energy distrubution (EED) produces different electromagnetic spectrum in the jet emission region of blazar. It is considered that shaping the EED in the region depends on the magnetic field distribution, layered structure of bulk Lorentz factor, and the physical processes, such as electron acceleration / cooling, injection, escape and so on. Using the observed multi-wavelength spectra energy distribution (SED) to determine the EED and then study on the formation mechanism of EED are a valid approach for constraint on the microphysics of jet. Since the electron it with a Maximum Lorentz factor lose the energy could produce the gamma-ray photons in the radiation region, the high-energy radiation mechanism for blazars will play an important role in determining the magnetic field distribution, layered structure of bulk Lorentz factor, and electron energy gain / loss process in the emission region. The aim of this project is to systematically study the electronic spectrum which generated by different physical conditions and physical processes in the jet emission region, and employ these EED to some special SEDs in gamma-ray energy bands. These work will determine the formation mechanism of both the energy spectra break in GeV gamma-ray energy band and a harden spectrum in TeV gamma-ray energy band and the physical environment. Based on the determinate environment of emission region, we construct a inhomogeneous jet model. On the other hand, it is expected to find a reasonable magnetic field distribution and layered structure of bulk Lorentz factor in the jet.

耀变体喷流辐射区内不同的电子谱产生不同谱形的电磁辐射能谱，而电子谱形成又依赖于辐射区内的磁场分布、体洛伦兹因子结构，以及电子的加速/冷却、注入、逃逸等物理过程。利用观测的电磁辐射能谱确定其电子谱，并对该电子谱形成机制进行研究是确定喷流辐射区物理条件和物理过程的有效途径。由于辐射区内最大洛伦兹因子的电子损失能量产生伽玛射线光子，因此，耀变体高能辐射机制的研究对确定辐射区磁场分布、体洛伦兹因子结构，以及电子能量获得/损失过程有重要意义。该项目将系统地研究喷流辐射区内不同物理条件和物理过程产生的电子谱，利用这些电子谱对耀变体的的一些特殊的高能辐射能谱进行研究，确定耀变体GeV伽玛射线能谱“拐折”和TeV伽玛射线“硬谱”形成机制和对应的辐射区物理条件，以此物理条件为依据，建立非均匀喷流辐射模型。上述研究工作有望找到合理的耀变体喷流辐射区内部磁场分布和喷流体洛伦兹因子分层结构。