Investigations in Theoretical Astrophysics

将开展理论天体物理学三大领域的研究。这些领域是：(i)引力透镜：已经发现了几个透镜的案例，在这些案例中，背景源被认为是一个扩展的星系，而不是更常见的点状类星体。本文将探讨扩展光源的透镜特性，并与观测结果进行比较。（二）射电脉冲星：将为银河系中脉冲星的诞生和演化制定详细的现象学模型。需要考虑的问题包括：(a)场衰减的时间尺度，(b)脉冲星速度与磁场的相关性，以及(c)脉冲星诞生时的初始旋转周期。（三）闪烁：由于散射引起的强度闪烁发生在各种天文情况下：(a)射电星际闪烁，(b)射电行星际闪烁，(c)地球大气中的光学闪烁，(d)行星大气中的光学闪烁，(e)电离层闪烁。利用基本理论框架的相似性，将探讨与(A)、(b)和(c)相关的各种现象。一些观测，利用太阳风作为闪烁实验室，将进行。

Research in three major areas of theoretical astrophysics will be carried out. The areas are: (i) Gravitational Lensing: Several cases of lensing have been discovered where the background source is thought to be an extended galaxy rather than the more common point-like quasar. The characteristics of lensing of extended sources will be explored and compared with observations. (ii) Radio Pulsars: A detailed phenomenological model for the birth and evolution of pulsars in the Galaxy will be developed. Issues to be considered include (a) the timescale of field decay, (b) correlation of pulsar velocity with magnetic field, and (c) the initial rotation periods of pulsars at birth. (iii) Scintillation: Intensity scintillation due to scattering occurs in a variety of astronomical situations: (a) Radio interstellar scintillation, (b) radio interplanetary scintillation, (c) optical scintillation in the earth's atmosphere, (d) optical scintillation in planetary atmospheres, (e) ionospheric scintillation. A variety of phenomena related to (a), (b) and (c) will be explored taking advantage of similarities in the basic theoretical framework. Some observations, using the solar wind as a scintillation laboratory, will be carried out.