Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1138k&link_type=abstract
Astronomical Journal, vol. 84, Aug. 1979, p. 1138-1148. Research supported by Lick Observatory
Astronomy and Astrophysics
Astronomy
64
H Lines, Hydrogen Clouds, Neutral Gases, Spiral Galaxies, Astronomical Catalogs, Galactic Rotation, Galactic Structure, Nebulae
Scientific paper
Results are reported for observations in which H I spectra were taken along the major axes of 14 large relatively edge-on spiral galaxies with the Arecibo 305-m telescope and a circular 21-cm-line feed system. The sidelobe problem for this feed is analyzed, and a procedure is developed for subtracting out the sidelobe contribution. It is found that: (1) the hydrogen extent of galaxies may not be a strong function of Hubble type; (2) gravitational mass (within the Holmberg diameter) is not a strong function of Hubble type; (3) early-type disk galaxies tend to have a higher surface density of mass than later-type spirals; (4) the rotation curves of late-type galaxies are generally flat throughout the disk, and well beyond the Holmberg diameter in some cases; and (5) velocities in the outer regions of close binaries are disturbed in various ways.
Krumm Nathan
Salpeter Edwin E.
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