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    Ultra-steep spectrum emission in the merging galaxy cluster Abell 1914

    76262.pdf (2.846Mb)
    Access Status
    Open access
    Authors
    Mandal, S.
    Intema, Huib
    Shimwell, T.W.
    Van Weeren, R.J.
    Botteon, A.
    Röttgering, H.J.A.
    Hoang, D.N.
    Brunetti, G.
    De Gasperin, F.
    Giacintucci, S.
    Hoekstra, H.
    Stroe, A.
    Brüggen, M.
    Cassano, R.
    Shulevski, A.
    Drabent, A.
    Rafferty, D.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Mandal, S. and Intema, H.T. and Shimwell, T.W. and Van Weeren, R.J. and Botteon, A. and Röttgering, H.J.A. and Hoang, D.N. et al. 2019. Ultra-steep spectrum emission in the merging galaxy cluster Abell 1914. Astronomy and Astrophysics. 622: ARTN A22.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201833992
    ISSN
    0004-6361
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Remarks

    Reproduced with permission from Astronomy & Astrophysics, © ESO

    URI
    http://hdl.handle.net/20.500.11937/76020
    Collection
    • Curtin Research Publications
    Abstract

    A number of radio observations have revealed the presence of large synchrotron-emitting sources associated with the intra-cluster medium. There is strong observational evidence that the emitting particles have been (re-)accelerated by shocks and turbulence generated during merger events. The particles that are accelerated are thought to have higher initial energies than those in the thermal pool but the origin of such mildly relativistic particles remains uncertain and needs to be further investigated. The galaxy cluster Abell 1914 is a massive galaxy cluster in which X-ray observations show clear evidence of merging activity. We carried out radio observations of this cluster with the LOw Frequency ARay (LOFAR) at 150 MHz and the Giant Metrewave Radio Telescope (GMRT) at 610 MHz. We also analysed Very Large Array (VLA) 1.4 GHz data, archival GMRT 325 MHz data, CFHT weak lensing data and Chandra observations. Our analysis shows that the ultra-steep spectrum source (4C38.39; α -2), previously thought to be part of a radio halo, is a distinct source with properties that are consistent with revived fossil plasma sources. Finally, we detect some diffuse emission to the west of the source 4C38.39 that could belong to a radio halo.

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