Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1581w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Nov. 1989, p. 1581-1587.
Astronomy and Astrophysics
Astronomy
17
Astronomical Maps, Galactic Nuclei, H Alpha Line, Seyfert Galaxies, Very Large Array (Vla), Emission Spectra, Energy Transfer, High Resolution, Line Spectra
Scientific paper
The central region of the type 2 Seyfert galaxy NGC 5929 is known to contain double radio-continuum and optical emission-line clouds separated by about 1 arcsec. High-resolution VLA mapping at 2 cm shows these two steep-spectrum radio clouds to be compact (about 13 pc FWHM) and well collimated on either side of a central source having a flatter spectrum. When the radio continuum and forbidden O III 5007-A image of Whittle et al. (1986) are compared at the same spatial resolution, there is no evidence that the separations or position angles of the radio and emission-line clouds differ. The double H-alpha clouds appear to differ in position angle by about 20 deg from the radio lobes. Large variations in excitation of the gas occur on the scale of the seeing. If the line-emitting clouds are confined in or near the radio lobes and the gas is ionized by a compact nuclear source, this source is likely to be beamed along the radio axis.
Keel William C.
Wilson Andrew S.
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