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    Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931

    74883.pdf (5.551Mb)
    Access Status
    Open access
    Authors
    Brüggen, M.
    Bonafede, A.
    van Weeren, R.
    Shimwell, T.
    Intema, Hubertus
    Röttgering, H.
    Brunetti, G.
    Di Gennaro, G.
    Savini, F.
    Wilber, A.
    O'Sullivan, S.
    Ensslin, T.
    De Gasperin, F.
    Hoeft, M.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Brüggen, M. and Bonafede, A. and van Weeren, R. and Shimwell, T. and Intema, H. and Röttgering, H. and Brunetti, G. et al. 2018. Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931. Monthly Notices of the Royal Astronomical Society. 477 (3): pp. 3461-3468.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/sty851
    ISSN
    0035-8711
    Remarks

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

    URI
    http://hdl.handle.net/20.500.11937/74598
    Collection
    • Curtin Research Publications
    Abstract

    Extended, steep-spectrum radio synchrotron sources are pre-dominantly found in massive galaxy clusters as opposed to groups. LOFAR Two-Metre Sky Survey images have revealed a diffuse, ultra-steep-spectrum radio source in the low-mass cluster Abell 1931. The source has a fairly irregular morphology with the largest linear size of about 550 kpc. The source is only seen in LOFAR observations at 143 MHz and Giant Metre Radio Telescope observations at 325 MHz. The spectral index of the total source between 143 and 325 MHz is a 143325 = -2.86 ± 0.36. The source remains invisible in Very Large Array (1-2 GHz) observations as expected given the spectral index. Chandra X-ray observations of the cluster revealed a bolometric luminosity of LX =(1.65±0.39)×1043 erg s-1 and a temperature of 2.92-0.87+1.89 keV which implies a mass of around ~1014 M?. We conclude that the source is a remnant radio galaxy that has shut off around 200 Myr ago. The brightest cluster galaxy, a radio-loud elliptical galaxy, could be the source for this extinct source. Unlike remnant sources studied in the literature, our source has a steep spectrum at low radio frequencies. Studying such remnant radio galaxies at low radio frequencies is important for understanding the scarcity of such sources and their role in feedback processes.

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