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Two-component scattering model and the electron density spectrum
Zhou, A. Z.1; Tan, J. Y.1; Esamdin, A.2; Wu, X. J.3
2010-02-01
Source PublicationASTROPHYSICS AND SPACE SCIENCE
ISSN0004-640X
Volume325Issue:2Pages:241-249
Contribution Rank2
Abstract

In this paper, we discuss a rigorous treatment of the refractive scintillation caused by a two-component interstellar scattering medium and a Kolmogorov form of density spectrum. It is assumed that the interstellar scattering medium is composed of a thin-screen interstellar medium (ISM) and an extended interstellar medium. We consider the case that the scattering of the thin screen concentrates in a thin layer represented by a delta function distribution and that the scattering density of the extended irregular medium satisfies the Gaussian distribution. We investigate and develop equations for the flux density structure function corresponding to this two-component ISM geometry in the scattering density distribution and compare our result with the observations. We conclude that the refractive scintillation caused by this two-component ISM scattering gives a more satisfactory explanation for the observed flux density variation than does the single extended medium model. The level of refractive scintillation is strongly sensitive to the distribution of scattering material along the line of sight (LOS). The theoretical modulation indices are comparatively less sensitive to the scattering strength of the thin-screen medium, but they critically depend on the distance from the observer to the thin screen. The logarithmic slope of the structure function is sensitive to the scattering strength of the thin-screen medium, but is relatively insensitive to the thin-screen location. Therefore, the proposed model can be applied to interpret the structure functions of flux density observed in pulsar PSR B2111 + 46 and PSR B0136 + 57. The result suggests that the medium consists of a discontinuous distribution of plasma turbulence embedded in the interstellar medium. Thus our work provides some insight into the distribution of the scattering along the LOS to the pulsar PSR B2111 + 46 and PSR B0136 + 57.

KeywordStars: Pulsars: General Radio Continuum: Stars Ism: Structure Scattering
SubtypeArticle
Subject Area致密天体、高能和基础物理
DOI10.1007/s10509-009-0182-8
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordRefractive Interstellar Scintillation ; Long-term Scintillation ; Local-bubble ; Pulsar Scintillation ; Galactic Distribution ; Intensity Variations ; Radio Scintillation ; Plasma-density ; Loop-i ; Mhz
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000273307500011
Funding OrganizationNational Natural Science Foundation (No. 10603002, No. 10573026, No. 10778611 and No. 10773004) of China
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/120
Collection射电天文研究室_脉冲星研究团组
光学天文与技术应用研究室
Corresponding AuthorZhou, A. Z.
Affiliation1.Huazhong Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China
2.Chinese Acad Sci, Urumqi Observ, Natl Astron Observ, Urumqi 830011, Peoples R China
3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Zhou, A. Z.,Tan, J. Y.,Esamdin, A.,et al. Two-component scattering model and the electron density spectrum[J]. ASTROPHYSICS AND SPACE SCIENCE,2010,325(2):241-249.
APA Zhou, A. Z.,Tan, J. Y.,Esamdin, A.,&Wu, X. J..(2010).Two-component scattering model and the electron density spectrum.ASTROPHYSICS AND SPACE SCIENCE,325(2),241-249.
MLA Zhou, A. Z.,et al."Two-component scattering model and the electron density spectrum".ASTROPHYSICS AND SPACE SCIENCE 325.2(2010):241-249.
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