High-Resolution Observations of the Multi-Component Nucleus of NGC 5929
Abstract
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 ~1". We report high-resolution VLA mapping at 2 cm, which shows these two steep-spectrum radio clouds to be compact (~0.08" ~ 13 pc FWHM) and well collimated on either side of a central source having a flatter spectrum. When the radio continuum and [0 III] λ 5007 image of Whittle et al. 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 Hα clouds appear to differ in position angle by ~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. Models of the relation between the synchrotron and emission-line gas in Seyfert nuclei are briefly reviewed in the light of these data.
- Publication:
-
The Astronomical Journal
- Pub Date:
- November 1989
- DOI:
- 10.1086/115242
- Bibcode:
- 1989AJ.....98.1581W
- Keywords:
-
- Astronomical Maps;
- Galactic Nuclei;
- H Alpha Line;
- Seyfert Galaxies;
- Very Large Array (Vla);
- Emission Spectra;
- Energy Transfer;
- High Resolution;
- Line Spectra;
- Astrophysics;
- GALAXIES: SEYFERT;
- GALAXIES: INDIVIDUAL;
- GALAXIES: STRUCTURE