Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..125t&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 1, 1982, p. 125-132. Research supported by the Research Corp. and NASA.
Astronomy and Astrophysics
Astrophysics
43
Absorption Spectra, Emission Spectra, Galactic Nuclei, Hydrogen, Neutral Gases, Radio Galaxies, Astronomical Maps, Brightness Distribution, Galactic Rotation, Line Spectra, Spectrum Analysis
Scientific paper
Peak optical H I absorption depths of 10% are found in a neutral hydrogen emission-absorption study of the active-nucleus Irr II galaxies NGC 520, 5363, and 5506. It is suggested that the absorption is due to a few standard clouds within several hundred parsecs of the nucleus, in the narrow-line emission region. The width of the absorption features is interpreted as being due to random motions of the gas within the absorbing clouds, in contrast to the large widths of the emission features that are due to the overall rotation of the galaxy.
Thuan Trinh Xuan
Wadiak Edward James
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