期刊
ASTROPHYSICAL JOURNAL
卷 826, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/0004-637X/826/2/170
关键词
Galaxy: nucleus; ISM: structure; radio continuum: ISM; scattering; techniques: interferometric; turbulence
资金
- National Science Foundation
- Gordon and Betty Moore Foundation [GBMF-3561]
- NSF [AST1312651]
- NASA [TCAN NNX14AB47G]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1312651] Funding Source: National Science Foundation
Newly recognized effects of refractive scattering in the ionized interstellar medium have broad implications for very long baseline interferometry (VLBI) at extreme angular resolutions. Building upon work by Blandford & Narayan, we present a simplified, geometrical optics framework, which enables rapid, semi-analytic estimates of refractive scattering effects. We show that these estimates exactly reproduce previous results based on a more rigorous statistical formulation. We then derive new expressions for the scattering-induced fluctuations of VLBI observables such as closure phase, and we demonstrate how to calculate the fluctuations for arbitrary quantities of interest using a Monte Carlo technique.
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