University of Hertfordshire Research Archive

        JavaScript is disabled for your browser. Some features of this site may not work without it.

        Browse

        All of UHRABy Issue DateAuthorsTitlesThis CollectionBy Issue DateAuthorsTitles

        Arkivum Files

        My Downloads
        View Item 
        • UHRA Home
        • University of Hertfordshire
        • Research publications
        • View Item
        • UHRA Home
        • University of Hertfordshire
        • Research publications
        • View Item

        A plethora of diffuse steep spectrum radio sources in Abell 2034 revealed by LOFAR

        View/Open
        1603.06591v1 (PDF, 8Mb)
        Author
        Shimwell, T. W.
        Luckin, J.
        Brüggen, M.
        Brunetti, G.
        Intema, H. T.
        Owers, M. S.
        Röttgering, H. J. A.
        Stroe, A.
        Weeren, R. J. van
        Williams, W. L.
        Cassano, R.
        Gasperin, F. de
        Heald, G. H.
        Hoang, D. N.
        Hardcastle, M.J.
        Sridhar, S. S.
        Sabater, J.
        Best, P. N.
        Bonafede, A.
        Chyży, K. T.
        Ensslin, T. A.
        Ferrari, C.
        Haverkorn, M.
        Hoeft, M.
        Horellou, C.
        McKean, J. P.
        Morabito, L. K.
        Orrù, E.
        Pizzo, R.
        Retana-Montenegro, E.
        White, G.J.
        Attention
        2299/17236
        Abstract
        With Low-Frequency Array (LOFAR) observations, we have discovered a diverse assembly of steep spectrum emission that is apparently associated with the intra cluster medium (ICM) of the merging galaxy cluster Abell 2034. Such a rich variety of complex emission associated with the ICM has been observed in few other clusters. This not only indicates that Abell 2034 is a more interesting and complex system than previously thought but it also demonstrates the importance of sensitive and high-resolution, low-frequency observations. These observations can reveal emission from relativistic particles which have been accelerated to sufficient energy to produce observable emission or have had their high energy maintained by mechanisms in the ICM. The most prominent feature in our maps is a bright bulb of emission connected to two steep spectrum filamentary structures, the longest of which extends perpendicular to the merger axis for 0.5Mpc across the south of the cluster. The origin of these objects is unclear, with no shock detected in the X-ray images and no obvious connection with cluster galaxies or AGNs. We also find that the X-ray bright region of the cluster coincides with a giant radio halo with an irregular morphology and a very steep spectrum. In addition, the cluster hosts up to three possible radio relics, which are misaligned with the cluster X-ray emission. Finally, we have identified multiple regions of emission with a very steep spectral index that seem to be associated with either tailed radio galaxies or a shock.
        Publication date
        2016-06-11
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stw661
        Other links
        http://hdl.handle.net/2299/17236
        Metadata
        Show full item record
        Keep in touch

        © 2019 University of Hertfordshire

        I want to...

        • Apply for a course
        • Download a Prospectus
        • Find a job at the University
        • Make a complaint
        • Contact the Press Office

        Go to...

        • Accommodation booking
        • Your student record
        • Bayfordbury
        • KASPAR
        • UH Arts

        The small print

        • Terms of use
        • Privacy and cookies
        • Criminal Finances Act 2017
        • Modern Slavery Act 2015
        • Sitemap

        Find/Contact us

        • T: +44 (0)1707 284000
        • E: ask@herts.ac.uk
        • Where to find us
        • Parking
        • hr
        • qaa
        • stonewall
        • AMBA
        • ECU Race Charter
        • disability confident
        • AthenaSwan