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    Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey

    272211.pdf (7.078Mb)
    Access Status
    Open access
    Authors
    Su, H.
    Macquart, Jean-Pierre
    Hurley-Walker, Natasha
    McClure-Griffiths, N.
    Jackson, Carole
    Tingay, Steven
    Tian, W.
    Gaensler, B.
    McKinley, B.
    Kapínska, A.
    Hindson, L.
    Hancock, Paul
    Wayth, Randall
    Staveley-Smith, L.
    Morgan, John
    Johnston-Hollitt, M.
    Lenc, E.
    Bell, M.
    Callingham, J.
    Dwarkanath, K.
    For, B.
    Offringa, A.
    Procopio, P.
    Wu, C.
    Zheng, Q.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Su, H. and Macquart, J. and Hurley-Walker, N. and McClure-Griffiths, N. and Jackson, C. and Tingay, S. and Tian, W. et al. 2018. Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey. Monthly Notices of the Royal Astronomical Society. 479 (3): pp. 4041-4055.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/sty1732
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/73228
    Collection
    • Curtin Research Publications
    Abstract

    We derive the synchrotron distribution in the Milky Way disc from H II region absorption observations over -40° < l < 40° at six frequencies of 76.2, 83.8, 91.5, 99.2, 106.9, and 114.6 MHz with the GaLactic and Extragalactic All-sky Murchison widefield array survey (GLEAM). We develop a new method of emissivity calculation by taking advantage of the Haslam et al. (1981) map and known spectral indices, which enable us to simultaneously derive the emissivity and the optical depth of H II regions at each frequency. We show our derived synchrotron emissivities based on 152 absorption features of H II regions using both the method previously adopted in the literature and our improved method. We derive the synchrotron emissivity from H II regions to the Galactic edge along the line of sight and, for the first time, derive the emissivity from H II regions to the Sun. These results provide direct information on the distribution of the Galactic magnetic field and cosmic ray electrons for future modelling.

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