arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.3775astro-ph.HE
收藏

关于射电平均廓线I:传播效应理论

On the mean profiles of radio pulsars I: Theory of the propagation effects

V. S. Beskin, A. A. Philippov

摘要:

本文用非均匀介质中波传播的Kravtsov-Orlov方法研究了传播效应对射电望远镜平均剖面的影响。这种方法允许我们首先考虑到从几何光学过渡到真空传播,回旋吸收,和波折射同时进行。此外,考虑了任意非偶极磁场位形、等离子体粒子的漂移运动及其实际能量分布。圆偏振的符号和位置角(p.a.)预测了寻常波和非常波沿剖面的导数。利用数值积分,我们现在可以模拟无线电散射的主要轮廓。结果表明,p.a.只有当对产生的多重数足够小而体等离子体洛伦兹因子足够大时,才能实现摆动。它还表明,值的p.a.最大导数通常用于确定磁偶极子和旋转轴之间的角度,它取决于等离子体参数,并且可能与旋转矢量模型(RVM)预测不同。

英文摘要:

We study the influence of the propagation effects on the mean profiles of radio pulsars using the Kravtsov-Orlov method of the wave propagation in the inhomogeneous media. This approach allows us firstly to include into consideration the transition from geometrical optics to vacuum propagation, the cyclotron absorption, and the wave refraction simultaneously. In addition, arbitrary non-dipole magnetic field configuration, drift motion of plasma particles, and their realistic energy distribution are taken into account. The one-to-one correspondence between the signs of circular polarization and position angle (p.a.) derivative along the profile for both ordinary and extraordinary waves is predicted. Using the numerical integration we now can model the main profiles of radio pulsars. It is shown that standard S-shape form of the p.a. swing can be realized for small enough pair production multiplicity and large enough bulk plasma Lorentz factor only. It is also shown that the value of p.a. maximum derivative, that is often used for determination the angle between magnetic dipole and rotation axis, depends on the plasma parameters and could differ from the rotation vector model (RVM) prediction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑