Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284...65j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. 65-71
Astronomy and Astrophysics
Astronomy
8
Active Galactic Nuclei, Cygnus Constellation, Line Spectra, Radio Astronomy, Radio Galaxies, Radio Jets (Astronomy), Emission Spectra, Morphology, Photoionization, Radio Emission, Shock Wave Interaction
Scientific paper
We present 340 nm continuum and (O II) line images of the nuclear region of the radio galaxy Cygnus A at 0.1 sec resolution. At this high resolution the northwestern of the two nuclear components is resolved into two separate, line emitting subcomponents, and the radio jet points accurately between them. This suggests that the radio jet has blasted a path through emission-line clouds, and that the emission line clouds, having cooled after the passage of the shock, are being photoionized by a (presumably hidden) central source or by the shock itself. We confirm previous detections of a small component at a location corresponding to the radio nuclear position and discuss the evidence for a possible bifurcation of the emission region on the unseen 'counterjet' side.
Jackson Neal
Macchetto Ferdinando
Miley George K.
Sparks William B.
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