VLBI observations of the nucleus of the radio galaxy Cygnus A

Details VLBI observations of the nucleus of the radio galaxy Cygnus A VLBI observations of the nucleus of the radio galaxy Cygnus A

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97l...1k&link_type=abstract

Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

17

Centimeter Waves, Energy Transfer, Galactic Nuclei, Radio Galaxies, Very Long Base Interferometry, Brightness, Galactic Radiation, Galactic Structure, Quasars, Spectral Energy Distribution

Scientific paper

The central component of the radio galaxy Cygnus A has been observed in several (very long baseline interferometry) experiments between 1975 and 1979, and the results have been combined to derive a model for the brightness distribution. Some 65% of the nuclear emission appears to come from a compact core. The remaining flux density comes from a more extended region (or regions) up to 4 or 5 mas away lying along a position angle near 100 deg, which is close to that of the extended lobes. Evidence that compact central components reflect the collimation and transport of energy to the outer lobes of radio galaxies is discussed, and several interpretations of the observed asymmetries are considered.

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