Radio Properties of Active Nearby Spiral Galaxies
Abstract
Following the definition of an active galaxy from an optical standpoint, the paper reviews the radio properties of the central regions of nearby spiral galaxies in order to determine whether they contain indications of ongoing nuclear activity. The nuclei of these galaxies are shown to exhibit little or no associated optical activity. Attention is given to examining radio emission from optically active spiral galaxies, such as the Sersic and Seyfert galaxies. An interesting result is that none of the optically discovered Seyfert galaxies shows the double structure typical of so many other energetic extragalactic radio sources. High-resolution radio contour maps of several spiral galaxies with large-scale disk structures having brightness temperatures much greater than 10 K are analyzed for optical features suggestive of nuclear activity.
- Publication:
-
Structure and Properties of Nearby Galaxies
- Pub Date:
- 1978
- Bibcode:
- 1978IAUS...77..205D
- Keywords:
-
- Galactic Radio Waves;
- Galactic Structure;
- Radio Sources (Astronomy);
- Spiral Galaxies;
- Active Galaxies;
- Astronomical Maps;
- Galactic Nuclei;
- Light Emission;
- Seyfert Galaxies;
- Astrophysics