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Title:
Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy
Authors:
Banfield, J. K.; Andernach, H.; Kapinska, A. D.; Rudnick, L.; Hardcastle, M. J.; Cotter, G.; Vaughan, S.; Jones, T. W.; Heywood, I.; Wing, J. D.; Wong, O. I.; Matorny, T.; Terentev, I. A.; López-Sánchez, Á. R.; Norris, R. P.; Seymour, N.; Shabala, S. S.; Willett, K. W.
Affiliation:
AA(Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO) ), AB(Departamento de Astronomía, DCNE, Universidad de Guanajuato, Apdo. Postal 144, CP 36000 Guanajuato, Gto., Mexico), AC(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); International Centre for Radio Astronomy Research-M468, The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia), AD(School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455, USA), AE(Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK), AF(Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK), AG(Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK), AH(School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455, USA), AI(CSIRO Astronomy and Space Science, Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia; Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa), AJ(Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA), AK(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); International Centre for Radio Astronomy Research-M468, The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia), AL(Zooniverse Citizen Scientist, c/o Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK), AM(Zooniverse Citizen Scientist, c/o Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK), AN(Australian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, Australia; Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia), AO(CSIRO Astronomy and Space Science, Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia; Western Sydney University, Locked Bag 1797, Penrith South, NSW 1797, Australia), AP(International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6102, Australia), AQ(School of Physical Sciences, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia), AR(School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 460, Issue 3, p.2376-2384 (MNRAS Homepage)
Publication Date:
08/2016
Origin:
CROSSREF; OUP
Astronomy Keywords:
galaxies: active, galaxies: clusters: individual: RGZ J082312.9+033301, radio continuum: galaxies
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw1067
Bibliographic Code:
2016MNRAS.460.2376B

Abstract

We have discovered a previously unreported poor cluster of galaxies (RGZ-CL J0823.2+0333) through an unusual giant wide-angle tail radio galaxy found in the Radio Galaxy Zoo project. We obtained a spectroscopic redshift of z = 0.0897 for the E0-type host galaxy, 2MASX J08231289+0333016, leading to Mr = -22.6 and a 1.4 GHz radio luminosity density of L1.4 = 5.5 × 1024 W Hz-1. These radio and optical luminosities are typical for wide-angle tailed radio galaxies near the borderline between Fanaroff-Riley classes I and II. The projected largest angular size of ≈8 arcmin corresponds to 800 kpc and the full length of the source along the curved jets/trails is 1.1 Mpc in projection. X-ray data from the XMM-Newton archive yield an upper limit on the X-ray luminosity of the thermal emission surrounding RGZ J082312.9+033301 at 1.2-2.6 × 1043 erg s-1 for assumed intracluster medium temperatures of 1.0-5.0 keV. Our analysis of the environment surrounding RGZ J082312.9+033301 indicates that RGZ J082312.9+033301 lies within a poor cluster. The observed radio morphology suggests that (a) the host galaxy is moving at a significant velocity with respect to an ambient medium like that of at least a poor cluster, and that (b) the source may have had two ignition events of the active galactic nucleus with 107 yr in between. This reinforces the idea that an association between RGZ J082312.9+033301 and the newly discovered poor cluster exists.
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