Wakes of ram-pressure-stripped disc galaxies |
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Authors: | Elke Roediger Marcus Brüggen Matthias Hoeft |
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Institution: | School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT;School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB;Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany |
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Abstract: | We present a sample of 30 wide-angle tailed radio galaxies (WATs) that we use to constrain the jet speeds in these sources. We measure the distribution of the jet-sidedness ratios for the sample, and assuming that the jets are beamed, the jet speeds in the range (0.3–0.7) c are obtained. Whilst the core prominence of the sample, which ought to be a reliable indicator of beaming, shows little correlation with the jet sidedness, we argue that due to the peculiar nature of the WATs, core prominence is unlikely to be a good indicator of beaming in these sources. We further show that if the jets are fast and light, then the galaxy speeds required to bend the jets into C-shapes such as those seen in 0647+693 are reasonable for a galaxy in a merging or recently merged cluster. |
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Keywords: | galaxies: active galaxies: clusters: general radio continuum: galaxies |
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