Mathematics – Logic
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apjs...63..515l&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 63, March 1987, p. 515-542.
Mathematics
Logic
47
Galactic Rotation, Hydrogen Clouds, Radio Galaxies, Spiral Galaxies, Disk Galaxies, Radial Velocity, Red Shift, Velocity Distribution
Scientific paper
The full results of an H I survey of face-on galaxies are presented and it is shown that narrow H I profiles are rare in normal spiral galaxies. This is due in part to the wider-than-expected range of the integral dispersion and in part to the frequent occurrence of large-scale distortions in the H I disk. These factors reduce the number of galaxies with half-power widths less than 30 km/s to about 24 percent of those that would occur if galaxies generally had quiescent, coplanar H I disks. Two useful subsets may be drawn from this study of 212 face-on galaxies with axial ratios greater than 0.87. Fifty-two spirals of all morphological types have half-power widths smaller than 100 km/s and may be used for studies that benefit from a small velocity spread and an enhanced beam-filling factor. About 40 galaxies have velocity widths much larger than expected and are of interest in studies of dynamically peculiar systems.
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