Radio scintillation of gamma-ray-burst afterglows

被引：160
|
作者：
Goodman, J
机构：
[1] Princeton University Observatory, Peyton Hall, Princeton
来源：
NEW ASTRONOMY | 1997年 / 2卷 / 05期
基金：
美国国家航空航天局;
关键词：
gamma rays: bursts; ISM: structure; scattering; techniques: interferometric;
D O I：
10.1016/S1384-1076(97)00031-6
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Stars twinkle to the eye through atmospheric turbulence, but planets, because of their larger angular size, do not. Similarly, scintillation due to the local interstellar medium will modulate the radio flux of gamma-ray-burst afterglows and may permit indirect measurements of their angular sizes. The amplitude of refractive scintillation is of order ten percent at ten gigahertz unless the source size is much larger than the expected size, of order microarcseconds. Diffractive scintillation is marginally possible, depending sensitively on the source size, observing frequency, and scattering measure of the interstellar medium. (C) 1997 Elsevier Science B.V.
引用
收藏
页码：449 / 460
页数：12
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