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    A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array

    252530.pdf (1.624Mb)
    Access Status
    Open access
    Authors
    George, L.
    Dwarakanath, K.
    Johnston-Hollitt, M.
    Intema, H.
    Hurley-Walker, Natasha
    Bell, M.
    Callingham, J.
    For, B.
    Gaensler, B.
    Hancock, Paul
    Hindson, L.
    Kapinska, A.
    Lenc, E.
    McKinley, B.
    Morgan, J.
    Offringa, A.
    Procopio, P.
    Staveley-Smith, L.
    Wayth, Randall
    Wu, C.
    Zheng, Q.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    George, L. and Dwarakanath, K. and Johnston-Hollitt, M. and Intema, H. and Hurley-Walker, N. and Bell, M. and Callingham, J. et al. 2017. A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array. Monthly Notices of the Royal Astronomical Society. 467 (1): pp. 936-949.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stx155
    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 ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/53576
    Collection
    • Curtin Research Publications
    Abstract

    We have studied radio haloes and relics in nine merging galaxy clusters using the Murchison Widefield Array (MWA). The images used for this study were obtained from the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey which was carried out at 5 frequencies, viz. 88, 118, 154, 188 and 215 MHz. We detect diffuse radio emission in 8 of these clusters. We have estimated the spectra of haloes and relics in these clusters over the frequency range 80-1400 MHz; the first such attempt to estimate their spectra at low frequencies. The spectra follow a power law with a mean value of $\alpha = -1.13\pm0.21$ for haloes and $\alpha = -1.2\pm0.19$ for relics where, $S \propto \nu^{\alpha}$. We reclassify two of the cluster sources as radio galaxies. The low frequency spectra are thus an independent means of confirming the nature of cluster sources. Five of the nine clusters host radio haloes. For the remaining four clusters, we place upper limits on the radio powers of possible haloes in them. These upper limits are a factor of 2-20 below those expected from the $L_{\rm X}-P_{\rm 1.4}$ relation. These limits are the lowest ever obtained and the implications of these limits to the hadronic model of halo emission are discussed.

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