The Nuclear Jet and Counterjet Region of the Radio Galaxy Cygnus A

Details The Nuclear Jet and Counterjet Region of the Radio Galaxy Cygnus A The Nuclear Jet and Counterjet Region of the Radio Galaxy Cygnus A

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pnas...9211371b&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 92, Issue 25, pp. 11371-11373

Physics

5

Scientific paper

Very-long-baseline interferometry images of the nuclear region of the radio galaxy Cygnus A reveal a pronounced "core" and a knotty jet and counterjet. The knots are moving away from the core at apparent speeds which are subluminal for h = 1 [h = H_0/100 km.s-1.Mpc-1;1 parsec (pc) = 3.09 x 1016m] and about c for h = 0.5. The jet is aligned with the outer, kiloparsec-scale jet to within 2^circ. The counterjet has a total flux density at 5 GHz of about one-fifth of that of the jet. In the context of the twin relativistic jet model for active galactic nuclei, the jet in Cygnus A is oriented at an angle to our line of sight of 35-80^circ and 55-85^circ, and the intrinsic velocity of the jet fluid is 0.4-0.6c and 0.6-1c for h = 1 and h = 0.5, respectively.

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