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The youngest lobe-dominated radio sources
Authors:I Owsianik  J E Conway  A G Polatidis  
Institution:1. Toruń Centre for Astronomy, ul. Gagarina 11, 87-100 Toruń, Poland;2. Onsala Space Observatory, S-43992 Onsala, Sweden;3. Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands;1. Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49b, 50674 Cologne, Germany;2. Institut für Kernphysik, University of Cologne, 50937 Cologne, Germany;3. School of GeoSciences, University of Edinburgh, Drummond St, Edinburgh EH8 9XP, UK;4. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany;5. Institut für Geologie und Paläontologie, Westfälische Wilhelms-Universität Münster, Corrensstraße 24, D-48149 Münster, Germany;6. Laboratory of Ion Beam Physics, ETH Zurich, CH-8093 Zurich, Switzerland;7. University of Tuebingen, Department of Geosciences, Wilhelmstrasse 56, 72074 Tuebingen, Germany;8. Aix-Marseille Univ., CNRS, IRD, Coll. France, UM 34 CEREGE, Technopôle de l’Environnement Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France;9. Institute of Geochemistry and Petrology, ETH Zurich, CH-8092 Zurich, Switzerland;10. School of Earth and Environmental Sciences, University of Wollongong, NSW 2522, Australia;11. Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2234, Australia;12. Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, UK;13. Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, ACT 0200, Australia;14. University of Bern, Institute of Geological Sciences, Baltzerstrasse 1-3, Bern, Switzerland;15. Universität Bremen, FB5 – Geowissenschaften, Postfach 330 440, 28344 Bremen, Germany;1. School of Earth and Climate Sciences and Climate Change Institute, University of Maine, Orono, ME, 04473, USA;2. Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, 10964, USA;3. School of Geography and Archaeology, Palaeoenvironmental Research Unit, National University of Ireland, Galway, Ireland;4. Department of Anthropology, Michigan State University, East Lansing, MI, 48824, USA;1. Department of Geology, University at Buffalo, Buffalo, NY 14260, USA;2. Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA;3. Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA;4. Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen k, Denmark
Abstract:We present an analysis of multi-epoch global VLBI observations of the Compact Symmetric Objects: 2352+495 and 0710+439 at 5 GHz. Analysis of data spread over almost two decades shows strong evidence for an increase in separation of the outer components of both sources at a rate of 0.2h−1c (for q=0.5 and H=100h km s−1Mpc−1). Dividing the overall sizes of the sources by their separation rates implies that these Compact Symmetric Objects have a kinematic age 104 years. These results (and those for other CSOs) strongly argue that CSOs are indeed very young sources that probably evolve into much larger classical doubles.
Keywords:Radio continuum: galaxies  Galaxies: active  Galaxies: compact  Galaxies: evolution  Galaxies: individual (0710+439  2352+495)
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