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    The diffuse radio emission around NGC 5580 and NGC 5588

    74901.pdf (4.321Mb)
    Access Status
    Open access
    Authors
    De Gasperin, F.
    Intema, Hubertus
    Williams, W.
    Brüggen, M.
    Murgia, M.
    Beck, R.
    Bonafede, A.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    De Gasperin, F. and Intema, H. and Williams, W. and Brüggen, M. and Murgia, M. and Beck, R. and Bonafede, A. 2014. The diffuse radio emission around NGC 5580 and NGC 5588. Monthly Notices of the Royal Astronomical Society. 440 (2): pp. 1542-1550.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stu360
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/74616
    Collection
    • Curtin Research Publications
    Abstract

    The galaxy pair NGC 5580 and NGC 5588 is part of a loose group of galaxies. They are surrounded by steep-spectrum, extended radio emission which was previously suggested to be a down-scaled example of Mpc-size radio haloes present in galaxies clusters. We present a multifrequency study of the radio emission aimed to clarify its nature. The source has been observed with the Giant Metrewave Radio Telescope at 235, 325 and 610 MHz and the images obtained were combined with archival data to cover the frequency range 150-1400 MHz. The new observations revealed the presence of a second, fainter lobe on the south-east of NGC 5580. The spectral index study of the source shows a flattening of the spectrum (which implies a younger particle population) close to the two galaxies. We argue that the extended radio emission is the remnant of a past activity cycle of the active galactic nucleus present in NGC 5580 and therefore a notable example of a dying radio galaxy located outside dense environments. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

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