Galactic synchrotron emissivity measurements between 250° MWA

H. Su, N. Hurley-Walker, C. A. Jackson, N. M. McClure-Griffiths, S. J. Tingay, L. Hindson, P. Hancock, R. B. Wayth, B. M. Gaensler, L. Staveley-Smith, J. Morgan, M. Johnston-Hollitt, E. Lenc, M. E. Bell, J. R. Callingham, K. S. Dwarkanath, B. Q. For, A. D. Kapińska, B. McKinley, A. R. OffringaP. Procopio, C. Wu, Q. Zheng

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    Synchrotron emission pervades the Galactic plane at low radio frequencies, originating from cosmic ray electrons interacting with the Galactic magnetic field. Using a low-frequency radio telescope, the Murchison Widefield Array (MWA), we measure the free-free absorption of this Galactic synchrotron emission by intervening HII regions along the line of sight. These absorption measurements allow us to calculate the Galactic cosmic-ray electron emissivity behind and in front of 47 detected HII regions in the region $250^\circ
    Original languageEnglish
    Pages (from-to)3163-3174
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number3
    Early online date17 Nov 2016
    Publication statusPublished - 1 Mar 2017


    • astro-ph.GA


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