Bidirectional Motion Observed in the Compact Symmetric Object 1946+708
Abstract
We present the first direct measurements of bidirectional motions in an extragalactic radio jet. The radio source 1946+708 is a compact symmetric object with striking S-symmetry identified with a galaxy at a redshift of 0.101. From observations 2 years apart we have determined the velocities of four compact components in the jet, the fastest of which has an apparent velocity of 1.09 h-1c. By pairing up the components, assuming they were simultaneously ejected in opposite directions, we derive a 1σ lower limit on the Hubble constant, H_0 > 42 km.s-1.Mpc-1.
- Publication:
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Proceedings of the National Academy of Science
- Pub Date:
- December 1995
- DOI:
- Bibcode:
- 1995PNAS...9211381T