高能天体物理中X射线和γ射线辐射机制的研究及应用

Under the support of NSFC No.19973005, I have completed the research work in two branches. The first is related with the main target of my researches, i.e. the theoretical study of the high-energy radiation mechanisms in astrophysics. I have got three outcomes as follows: 1). I obtained an improved and extended formulae system for the Cerenkov line-like radiation, which can be used for the x-ray emission lines of the complicated multi-electron atoms and molecules, rather than for the optical lines of hydrogen or hydrogen-like atoms, as in my original paper. Furthermore, I obtained the physical conditions under which the Cerenkov line emission dominates over the normal line produced by the spontaneous transition. 2). I presented a simplified formulae system for the resonant inverse Compton scattering(RICS) of a fast electron in the intense magnetic field. In recent years, people recognize that the RICS mechanism is a very important radiation mechanism in the gamma-ray band, which has potential applications in gamma-ray astronomy. Our new results render the RICS easily applicable in practice. 3). We gave a new theoretical analysis on the absorption section of the two-photon annihilation and formulae for the absorption coefficient in the annihilation process..The second branch of my research concerns with the direct astronomical topics, i.e. the study on the x-ray binary GX339-4 and the gamma-ray bursts. We have published two papers on these subjects. 1).Possibility of the H-like and He-like iron line emission from the black hole candidate x-ray binary GX 339-4 in the ADAF case.2).Cerenkov line emission as a possible mechanism of x-ray lines in gamma-ray bursts(GRBs).

随着空间技术的进步，X射线和Y射线天文学正快速成长。新发现层出不穷，使高能天体物理有可能成为下世纪天文学和物理学的最前沿。而探讨其辐射机理是研究这些奇异天体最关键的一步。我们预期磁逆康普顿散射和切仑科夫线状发射是两种非常重要的高能辐射机制。计划创立和完善基本理论，建立简明解析公式。并应用于Y爆源和活动星系核的铁K 线的理论Ｐ汀