A survey of H I in Seyfert galaxies.
Abstract
Radio observations of H I in the disks of some 58 Seyfert or Seyfertlike galaxies with recession velocities less than about 10,000 km/s are reported. H I emission was detected in 25 of the galaxies, while H I absorption lines were observed in three. Integrated H I characteristics of the 25 detections are examined, and crude H I maps are presented for four relatively large galaxies. It is found that there may be a relation between abnormal H I mass/photographic luminosity ratios and an extranuclear UV excess in Seyfert galaxies, that Seyferts with unusual H I properties tend to be morphologically peculiar, and that there is a strong tendency for those galaxies with the most luminous nuclei to have unusual H I properties. The results suggest that the presence of a large central mass concentration plus some disk component favors the production of a Seyfert nucleus, that a gaseous disk aids in the production of such a nucleus, and that outbursts of nuclear activity may play a central role in recycling gas in early-type galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1978
- DOI:
- 10.1086/156423
- Bibcode:
- 1978ApJ...224..745H
- Keywords:
-
- H Lines;
- Hydrogen Clouds;
- Radio Astronomy;
- Seyfert Galaxies;
- Absorption Spectra;
- Astronomical Maps;
- Galactic Evolution;
- Galactic Nuclei;
- Galactic Structure;
- Mass Distribution;
- Radio Spectra;
- Red Shift;
- Spectral Line Width;
- Ubv Spectra;
- Astronomy;
- Neutral Hydrogen:Seyfert Galaxies