Kavli Affiliate: Luis C. Ho
| First 5 Authors: Gopal-Krishna, Ravi Joshi, Dusmanta Patra, Xiaolong Yang, Luis C. Ho
| Summary:
We report observations of a bright dumb-bell system of galaxies ($z =0.162$)
with the upgraded Giant Metrewave Radio Telescope ($u$GMRT), which show that
each member of this gravitationally bound pair of galaxies hosts bipolar radio
jets extended on 100 kiloparsec scales. Only two cases of such radio morphology
have been reported previously, both being dumb-bell systems, as well. The
famous first example, 3C 75, was discovered 4 decades ago, and the second case
was discovered 3 decades ago. This implies that such `Twin-Radio-Galaxies’
(TRGs) are an exceedingly rare phenomenon. As in the case of its two senior
cousins, the bi-polar radio jets of the present TRG (J104454+354055) exhibit
strong wiggles and are edge-darkened (Fanaroff-Riley class I). However, there
are important differences, too. For instance, the jets in the present TRG do
not merge and, moreover, show no signs of distortion due to an external
crosswind. This makes the present TRG a much neater laboratory for studying the
physics of (sideway) colliding jets of relativistic plasma. This TRG has a
Wide-Angle-Tail (WAT) neighbour hosted by another bright galaxy belonging to
the same group, which appears to be moving towards the TRG.
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