Investigations in Theoretical Astrophysics

理论天体物理学研究

• 批准号: 8814725
• 负责人: Ramesh Narayan
• 金额: $ 6万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-01-01 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8814725&HistoricalAwards=false
• 关键词: Investigations; Theoretical; Astrophysics

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.

在理论天体物理学的三个主要领域的研究将是 贯彻 这些区域包括： (i)引力透镜：已经有几个透镜的例子。 发现了背景源被认为是 而不是更常见的点状类星体。 扩展源的透镜效应的特性将是 探索并与观察结果进行比较。 (ii)射电脉冲星：一个详细的现象学模型 银河系中恒星的诞生和进化将得到发展。 需要考虑的问题包括：（a）磁场衰减的时间尺度， (b)脉冲星速度与磁场的相关性，以及（c） 出生时的最初旋转周期。 (iii)闪烁：散射引起的强度闪烁 发生在各种天文情况：（a）无线电 星际闪烁，（B）行星际射电 闪烁，（c）地球的光学闪烁 （d）行星大气中的光学闪烁， (e)电离层闪烁 各种各样的现象， (a)、（B）和（c）将利用 基本理论框架的相似性。 一些 观测，使用太阳风作为闪烁实验室， 将被执行。