Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..371u&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 2, Sept. 15, 1992, p. 371-376.
Astronomy and Astrophysics
Astronomy
41
Active Galactic Nuclei, Line Spectra, Oxygen Spectra, Photoionization, Astronomical Polarimetry, Galactic Nuclei, Nuclear Radiation Spectroscopy, Radio Emission
Scientific paper
Results are presented of Taurus observations of the forbidden O III 5007-A emission from NGC 1068 which show that most of the high-excitation line emission originates in an edge-brightened cone. The morphology, excitation, and kinematic properties of this forbidden O III cone imply that the line-emitting gas is photoionized by a highly anisotropic nuclear radiation field. A PA of 31 +/- 3 deg and a projected opening angle of 40 +/- 3 deg are derived. It is suggested that the edge-brightening of the forbidden O III cone might be due either to the presence of relatively dense gas along the cone axis, associated with the radio components, or to a density enhancement along the cone edges caused by a lateral expansion of the ionized material within the cone. It is speculated that different collimation mechanisms may be relevant on different size-scales.
Axon David J.
Lewis James R.
Pedlar Alan
Unger Stephen W.
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