Fitting Formula for Flux Scintillation of Compact Radio Sources | Zendy

Jeremy Goodman | Zendy; Ramesh Narayan | Zendy

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Fitting Formula for Flux Scintillation of Compact Radio Sources

Author(s) -

Jeremy Goodman,

Ramesh Narayan

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/497903

Subject(s) - physics , scintillation , flux (metallurgy) , scattering , astrophysics , function (biology) , correlation function (quantum field theory) , angular diameter , interstellar medium , computational physics , optics , quantum mechanics , stars , galaxy , materials science , evolutionary biology , detector , dielectric , metallurgy , biology

We present a fitting function to describe the statistics of flux modulationscaused by interstellar scintillation. The function models a very generalquantity: the cross-correlation of the flux observed from a compact radiosource of finite angular size observed at two frequencies and at two positionsor times. The formula will be useful for fitting data from sources such asintra-day variables and gamma-ray burst afterglows. These sources are oftenobserved at relatively high frequencies (several gigahertz) where interstellarscattering is neither very strong nor very weak, so that asymptotic formulaeare inapplicable.Comment: 36 pages, 8 figures. To be published in Ap

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