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PULSAR OBSERVATIONS OF EXTREME SCATTERING EVENTS
Coles, W. A.1; Kerr, M.2; Shannon, R. M.2; Hobbs, G. B.2; Manchester, R. N.2; You, X. -P.3; Bailes, M.4; Bhat, N. D. R.5; Burke-Spolaor, S.6; Dai, S.2,7; Keith, M. J.8; Levin, Y.9; Oslowski, S.10,11; Ravi, V.2,12; Reardon, D.2,9; Toomey, L.2; van Straten, W.4; Wang, J. B.13,14; Wen, L.15; Zhu, X. J.2,15
2015-08-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume808Issue:2Pages:113
Contribution Rank13
Abstract

Extreme scattering events (ESEs) in the interstellar medium (ISM) were first observed in regular flux measurements of compact extragalactic sources. They are characterized by a flux variation over a period of weeks, suggesting the passage of a "diverging plasma lens" across the line of sight (LOS). Modeling the refraction of such a lens indicates that the structure size must be of the order of AU and the electron density of the order of 10s of cm(-3). Similar structures have been observed in measurements of pulsar intensity scintillation and group delay. Here we report observations of two ESEs, showing increases in both intensity scintillation and dispersion made with the Parkes Pulsar Timing Array. These allow us to make more complete models of the ESE, including an estimate of the "outer-scale" of the turbulence in the plasma lens. These observations clearly show that the ESE structure is fully turbulent on an AU scale. They provide some support for the idea that the structures are extended along the LOS, such as would be the case for a scattering shell. The dispersion measurements also show a variety of AU scale structures that would not be called ESEs, yet involve electron density variations typical of ESEs and likely have the same origin.

Correspondent Emailbcoles@ucsd.edu
KeywordIsm: Structure Pulsars: General Turbulence
SubtypeArticle
DOI10.1088/0004-637X/808/2/113
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordInterstellar Scintillation ; Compact Structures ; Outer Scale ; Plasma ; Turbulence ; Spectra ; Galaxy ; Time
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000371002400008
Funding OrganizationCommonwealth Government ; Alexander von Humboldt Foundation
Citation statistics
Cited Times:45[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/1386
Collection射电天文研究室_脉冲星研究团组
射电天文研究室
Corresponding AuthorColes, W. A.
Affiliation1.Univ Calif San Diego, ECE Dept, La Jolla, CA USA
2.CSIRO Astron & Space Sci, ATNF, Epping, NSW 1710, Australia
3.Southwest Univ, Chongqing, Peoples R China
4.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
5.Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia
6.CALTECH, Pasadena, CA 91125 USA
7.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
8.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England
9.Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800, Australia
10.Max Planck Inst Radioastron, D-53121 Bonn, Germany
11.Univ Bielefeld, Dept Phys, D-33615 Bielefeld, Germany
12.Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia
13.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China
14.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
15.Univ Western Australia, Crawley, WA 6009, Australia
Recommended Citation
GB/T 7714
Coles, W. A.,Kerr, M.,Shannon, R. M.,et al. PULSAR OBSERVATIONS OF EXTREME SCATTERING EVENTS[J]. ASTROPHYSICAL JOURNAL,2015,808(2):113.
APA Coles, W. A..,Kerr, M..,Shannon, R. M..,Hobbs, G. B..,Manchester, R. N..,...&Zhu, X. J..(2015).PULSAR OBSERVATIONS OF EXTREME SCATTERING EVENTS.ASTROPHYSICAL JOURNAL,808(2),113.
MLA Coles, W. A.,et al."PULSAR OBSERVATIONS OF EXTREME SCATTERING EVENTS".ASTROPHYSICAL JOURNAL 808.2(2015):113.
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