Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263...87d&link_type=abstract
Astrophysical Journal, Part 1, vol. 263, Dec. 1, 1982, p. 87-93.
Astronomy and Astrophysics
Astronomy
47
Absorption Spectra, Active Galaxies, Galactic Nuclei, Hydrogen Clouds, Seyfert Galaxies, Spiral Galaxies, Very Long Base Interferometry, Antenna Arrays, Hydrogen Atoms, Radio Antennas, Radio Astronomy
Scientific paper
Spiral galaxies with strong nuclear radio-continuum emission have been surveyed for H I absorption at 21 cm wavelength. Eight galaxies show clear or tentative absorption lines. The absorption line centers are offset from the galaxy systemic velocities by up to 300 km/s; for the entire sample, there is an overall preference for infall of gas toward the nucleus rather than outflow (+ 98 km/s median relative velocity). Cases with both positive and negative relative velocities are apparent. The presence of absorption appears to be correlated with the inclination of the galaxies: edge-on systems are more likely to show absorption lines. For the detected lines, the total absorption (equivalent width) is much greater than would be expected from the disk of our Galaxy.
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