Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..522d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, April 1, 1990, p. 522-531.
Astronomy and Astrophysics
Astronomy
119
Gas Dynamics, Radio Sources (Astronomy), Spiral Galaxies, Very Large Array (Vla), Gas Density, H Lines
Scientific paper
The motion of gas in the galaxy NGC 1058 is examined, using VLA observations to map emission in the 21-cm line. The hypothesis that the rotation curve drops faster than Keplerian at the outer edge of the disk is confirmed. It is found that the line width decreases with optical surface brightness, but in the extended gas disk beyond the Holmberg radius, the line width is constant. The observations show no correlation between line width and spiral phase of H I surface density in the outer disk. Evidence is found for an intermediate velocity cloud population with a velocity width several times broader than that of the bulk of the H I in the optically bright disk.
Dickey John M.
Hanson Margaret Murray
Helou George
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