类Crab脉冲星的三维磁层外隙模型

A Three-dimensional Outer- magnetospheric Gap Model for Crab-like Pulsars

利用三维脉冲星磁展模型研究了磁层外隙的几何结构．首先用自洽模型确定“外隙”的垂直尺度，在该模型中外隙尺度受回流的外隙流（带有隙加速的带电粒子发射的曲率光子）加热极帽而产生的热光子的碰撞而成对生成所限．外隙的横向尺度也受本地对生成所限．在脉冲星的磁层中，原则上有两个拓扑分离的外隙，允许同时进入和流出粒子．不过，流入粒子流产生的辐射形态受隙中本地对生成和恒星附近的磁对生成的严格的制约．根据外隙及其本地结构的三维模型计算了类Ｃｒａｂ脉冲星的辐射形态和相位分解谱．

We use a three dimensional pulsar magnetosphere model to study the geometry of outermagnetospheric gaps. The vertical size of the 'outer gap' is first determined by a self-consistent model in which the outer gap size is limited by pair production from collisions of thermal photons produced from polar cap heating by backflow outer gap current with curvature photons emitted by gap accelerated charged particles. The transverse size of the outer gap is also determined by local pair production limits. In principle, there are two topologically disconnected outer gaps in the magnetosphere of a pulsar. Both incoming and outgoing particle flows are allowed. However, the emission morphologies produced by incoming particle flow is severely restricted by local pair production in the gap and the absorption of magnetic pair production near the star. Mom the three dimensional structure of the outer gap and its local properties, we calculate the emission morphologies and phase-resolved spectra of Crab-like pulsars.