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    Scintillation-induced variability in radio absorption spectra against extragalactic sources

    134626_17586_0412493v1.pdf (322.9Kb)
    Access Status
    Open access
    Authors
    Macquart, Jean-pierre
    Date
    2005
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Macquart, J. P. 2005. Scintillation-induced variability in radio absorption spectra against extragalactic sources. Astronomy and Astrophysics. 433 (3): pp. 827-840.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361:20034425
    ISSN
    0004-6361
    Faculty
    Faculty of Science and Engineering
    Curtin Institute of Radio Astronomy
    Remarks

    © INRA, EDP Sciences, 2005

    URI
    http://hdl.handle.net/20.500.11937/40033
    Collection
    • Curtin Research Publications
    Abstract

    Spectral features absorbed against some radio quasars exhibit ~50 mJy variations, with the lines varying both relative to the continuum and, when several lines are present, even relative to one another. We point out that such variability can be expected as a consequence of refractive scintillation caused by the interstellar medium of our Galaxy. Scintillation can cause independent variations between closely-spaced spectral lines, and can even alter the line profile. The background source need not he compact to exhibit spectral variability. The variability can he used to infer the parsec to sub-parsec scale structure of the intervening absorbing material. We discuss the importance of scintillation relative to other possible origins of spectral variability. The present theory is applied to account for the variations observed in the HI-absorbed quasar PKS I 127-145.

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