Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..190d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. 190-202. Research supported by the University of Minn
Astronomy and Astrophysics
Astronomy
43
Absorption Spectra, Active Galaxies, Galactic Nuclei, Hydrogen, Neutral Gases, Radio Astronomy, Spiral Galaxies, Centimeter Waves, Mass Distribution, Radio Sources (Astronomy), Seyfert Galaxies, Spectral Line Width
Scientific paper
Nineteen spiral and irregular galaxies with bright continuum nuclei have been observed with the VLA to search for absorption at λ = 21 cm by cool atomic hydrogen in or in front of the nuclei. Most of these galaxies show activity at other wavelengths, such as Seyfert nuclei, intense far-IR emission, and X-ray emission. Fifteen absorption lines were detected, and six tentatively detected, in 15 of these galaxies. The line centers are offset from the systemic velocities by as much as 500 km s-1. Infall is more common than outflow at these high velocities, although the more common lines with offsets of less than 100 km s-1 are evenly distributed between infall and outflow.
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