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    Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies

    74196.pdf (5.073Mb)
    Access Status
    Open access
    Authors
    Sommer, M.
    Basu, K.
    Intema, Hubertus
    Pacaud, F.
    Bonafede, A.
    Babul, A.
    Bertoldi, F.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sommer, M. and Basu, K. and Intema, H. and Pacaud, F. and Bonafede, A. and Babul, A. and Bertoldi, F. 2017. Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies. Monthly Notices of the Royal Astronomical Society. 466 (1): pp. 996-1009.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stw3015
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/73911
    Collection
    • Curtin Research Publications
    Abstract

    Radio haloes are diffuse synchrotron sources on scales of ~1 Mpc that are found in merging clusters of galaxies, and are believed to be powered by electrons re-accelerated by mergerdriven turbulence. We present measurements of extended radio emission on similarly large scales in two clusters of galaxies hosting cool cores: Abell 2390 and Abell 2261. The analysis is based on interferometric imaging with the Karl G. Jansky Very Large Array, Very Large Array and Giant Metrewave Radio Telescope.We present detailed radio images of the targets, subtract the compact emission components and measure the spectral indices for the diffuse components. The radio emission in A2390 extends beyond a known sloshing-like brightness discontinuity, and has a very steep in-band spectral slope at 1.5 GHz that is similar to some known ultrasteep spectrum radio haloes. The diffuse signal in A2261 is more extended than in A2390 but has lower luminosity. X-ray morphological indicators, derived from XMM-Newton X-ray data, place these clusters in the category of relaxed or regular systems, although some asymmetric features that can indicate past minor mergers are seen in the X-ray brightness images. If these two Mpc-scale radio sources are categorized as giant radio haloes, they question the common assumption of radio haloes occurring exclusively in clusters undergoing violent merging activity, in addition to commonly used criteria for distinguishing between radio haloes and minihaloes.

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