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Group of galaxies around the giant radio galaxy 4C 73.08

Authors

  • R. Chen,

    Corresponding author
    1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
    2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Beijing 100012, China
      E-mail: chenrr@nao.cas.cn
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  • B. Peng,

    1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
    2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Beijing 100012, China
    3. Joint Laboratory for Radio Astronomy Technology, Datun Road A20, Beijing 100012, China
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  • R. G. Strom,

    1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
    2. Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo, the Netherlands
    3. Astronomical Institute ‘Anton Pannekoek’, Faculty of Science, University of Amsterdam, the Netherlands
    4. Centre for Astronomy, James Cook University, Townsville, QLD 4811, Australia
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  • J. Wei

    1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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E-mail: chenrr@nao.cas.cn

ABSTRACT

The optical field of the giant radio galaxy (GRG) 4C 73.08 has been spectroscopically investigated to look for companions to the host 7Zw 292. We have taken spectra of 12 candidates and have determined redshifts for all of them. When combined with the previously known redshift of 7Zw 292, we find that the radio source is accompanied by a small group of nine galaxies, of which the GRG host is the brightest. Seven members of the group lie within 350 kpc of 7Zw 292, gathered around the brighter, more compact component of the double radio source. The whole group has a velocity dispersion of ∼270 km s−1. We discuss this result in the light of the X-ray emission which has been detected from the region. 4C 73.08 follows the pattern found in other GRGs of being associated with a small group, but not falling in a rich cluster.

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