Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..745h&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Sept. 15, 1978, p. 745-760. Research supported by the University of Washington.
Astronomy and Astrophysics
Astronomy
145
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
Scientific paper
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.
Balick Bruce
Heckman Timothy M.
Sullivan Woodruff T. III
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