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    Multi-wavelength observations of the dissociative merger in the galaxy cluster ciza J0107.7+5408

    75165.pdf (4.690Mb)
    Access Status
    Open access
    Authors
    Randall, S.
    Clarke, T.
    Van Weeren, R.
    Intema, Hubertus
    Dawson, W.
    Mroczkowski, T.
    Blanton, E.
    Bulbul, E.
    Giacintucci, S.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Randall, S. and Clarke, T. and Van Weeren, R. and Intema, H. and Dawson, W. and Mroczkowski, T. and Blanton, E. et al. 2016. Multi-wavelength observations of the dissociative merger in the galaxy cluster ciza J0107.7+5408. Astrophysical Journal. 823 (2): Article ID 94.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/0004-637X/823/2/94
    ISSN
    0004-637X
    Remarks

    This is an author-created, un-copy edited version of an article accepted for publication in Astrophysical Journal. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.3847/0004-637X/823/2/94.

    URI
    http://hdl.handle.net/20.500.11937/74880
    Collection
    • Curtin Research Publications
    Abstract

    We present results based on X-ray, optical, and radio observations of the massive galaxy cluster CIZA J0107.7+5408. We find that this system is a post-core-passage, dissociative, binary merger, with the optical galaxy density peaks of each subcluster leading their associated X-ray emission peaks. This separation occurs because the diffuse gas experiences ram pressure forces, while the effectively collisionless galaxies (and presumably their associated dark matter (DM) halos) do not. This system contains double-peaked diffuse radio emission, possibly a double radio relic with the relics lying along the merger axis and also leading the X-ray cores. We find evidence for a temperature peak associated with the SW relic, likely created by the same merger shock that is powering the relic radio emission in this region. Thus, this system is a relatively rare, clean example of a dissociative binary merger, which can in principle be used to place constraints on the self-interaction cross-section of DM. Low-frequency radio observations reveal ultra-steep spectrum diffuse radio emission that is not correlated with the X-ray, optical, or high-frequency radio emission. We suggest that these sources are radio phoenixes, which are preexisting non-thermal particle populations that have been re-energized through adiabatic compression by the same merger shocks that power the radio relics. Finally, we place upper limits on inverse Compton emission from the SW radio relic.

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