VLBI observations of the nuclear jet in Cygnus A

Details VLBI observations of the nuclear jet in Cygnus A VLBI observations of the nuclear jet in Cygnus A

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1691c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1691-1695, 1902.

Astronomy and Astrophysics

Astrophysics

19

Cygnus Constellation, Radio Galaxies, Radio Jets (Astronomy), Very Long Base Interferometry, Interstellar Matter, Nuclear Astrophysics, Radio Scattering, Very Large Array (Vla)

Scientific paper

An image of the 'core' and inner jet of Cygnus A is presented at an angular resolution of 2 mas, obtained from Mark III VLBI observations at 6 cm wavelength with an array of nine antennas. The core is resolved, at least partly due to its being broadened by scattering in the Galactic interstellar medium. The jet has several condensations out to a distance of about 25 mas from the core and has a fairly constant FWHM of about 2.2 mas. The parsec-scale jet points toward the arcsec-scale jet observed with the VLA to within 4 deg. The ratio between the flux density of the jet and that of the counterjet is greater than 15:1. From a comparison with an earlier VLBI image of Cygnus A, an upper limit to the apparent velocity of the brightest knot in the jet is found to be about 2c, where c is the speed of light (for H0 = 60 km/sec Mpc, q0 = 0).

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