摘要
正负电子湮灭形成的511keV线谱是高能天体物理学光子能谱中的重要成分.本文通过Monte Carlo计算,研究了吸积双星系统(典型的如 CygX-3)中的正负电子湮灭过程.结果表明,一定物理环境下吸积双星系统可以发射较窄的正负电子湮灭线,它的流强和宽度依赖于双星系统发射的高能γ光子的强度大小,X射线晕的状态、尺度和温度分布以及吸积盘中电子的密度大小和分布.本文也讨论了现代的实验(如GRO卫星上的OSSE探测器)观测它的可能性.
The electron-positron annihilation process around binary systems, typically the Cygnus X-3, was investigated in detail. The Monte Carlo calculation predicts an existance of a 511 KeV annihilation line from the binary system. Its intensity and width depend on the electron density, size and temperature of X-ray photons arcund a binary system. The line profile is quite different from that emitted from the galactic enrter.
基金
国家自然科学基金
关键词
吸积双星
X辐射
射线能谱
Binary systems-X-rays-rrrrrrrrrr-rays-annihilation line
