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

        Studying the late evolution of a radio-loud AGN in a galaxy group with LOFAR

        View/Open
        1711.01273.pdf (PDF, 8Mb)
        Author
        Savini, F.
        Bonafede, A.
        Brüggen, M.
        Wilber, A.
        Harwood, J. J.
        Murgia, M.
        Shimwell, T.
        Rafferty, D.
        Shulevski, A.
        Brienza, M.
        Hardcastle, M. J.
        Morganti, R.
        Röttgering, H.
        Clarke, A. O.
        de Gasperin, F.
        van Weeren, R.
        Best, P. N.
        Botteon, A.
        Brunetti, G.
        Cassano, R.
        Attention
        2299/20563
        Abstract
        Feedback by radio-loud active galactic nuclei (AGNs) in galaxy groups is not fully understood. Open questions include the duty cycle of theAGN, the spatial extent of the radio lobes, the effect they have on the intragroup medium and the fate of the cosmic rays.We present the discovery of a 650 kpc-radio galaxy embedded in steep diffuse emission at z=(0.18793 ± 5) × 10-5 located at the centre of the galaxy groupMaxBCGJ199.31832 + 51.72503 using an observation from the LOFAR Two-metre Sky Survey (LoTSS) at the central frequency of 144 MHz. Subsequently, we performed a Giant Meterwave Radio Telescope observation at the central frequency of 607 MHz to study the spectral properties of the source. The observations reveal a radio galaxy with a total radio power Ptot, 1.4 ~ 2.1 × 1024 WHz-1, exhibiting two asymmetrical jets and lobes. The derived spectral index map shows a steepening towards the inner regions and a steep-spectrum core region. We model the integrated radio spectrum, providing two possible interpretations: the radio source is evolved but still active or it is just at the end of its active phase. Finally, in the same field of view we have discovered Mpc-sized emission surrounding a close pair of AGN located at a redshift z = (0.0587 ± 2) × 10-4 (SDSS J131544.56+521213.2 and SDSS J131543.99 + 521055.7) which could be a radio remnant source.
        Publication date
        2018-03-11
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/MNRAS/STX2876
        Other links
        http://www.scopus.com/inward/record.url?scp=85046081273&partnerID=8YFLogxK
        Metadata
        Show full item record

        Related items

        Showing items related by title, author, creator and subject.

        • The H alpha galaxy survey. I. The galaxy sample, H alpha narrow-band observations and star formation parameters for 334 galaxies 

          James, P.A.; Shane, N.S.; Beckman, J.E.; Cardwell, A.; Collins, C.A.; Etherton, J.; de Jong, R.S.; Fathi, K.; Knapen, J.; Peletier, R.F.; Percival, S.M.; Pollacco, D.L.; Seigar, M.S.; Stedman, S. (2004)
          We discuss the selection and observations of a large sample of nearby galaxies, which we are using to quantify the star formation activity in the local Universe. The sample consists of 334 galaxies across all Hubble types ...
        • On the Key Processes that Drive Galaxy Evolution: the Role of Galaxy Mergers, Accretion, Local Environment and Feedback in Shaping the Present-Day Universe 

          Martin, Garreth (2019-07-17)
          The study of galaxy evolution is a fundamental discipline in modern astrophysics, dealing with how and why galaxies of all types evolve over time. The diversity of present-day galaxies is a reflection of the processes ...
        • X-ray constraints on galaxy-gas-jet interactions in the Dumbbell Galaxies NGC4782 and NGC4783 in the LGG316 group 

          Machacek, M.E.; Kraft, R.P.; Jones, C.; Forman, W.R.; Hardcastle, M.J. (2007)
        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