Rotation curves for the neutral-hydrogen subsystem in the Galaxy

Details Rotation curves for the neutral-hydrogen subsystem in the Galaxy Rotation curves for the neutral-hydrogen subsystem in the Galaxy

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pazh....5..632p&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 5, Dec. 1979, p. 632-635.) Soviet Astronomy Letters, vol. 5, Nov.-Dec. 1979, p. 338, 33

Astronomy and Astrophysics

Astronomy

7

Galactic Rotation, Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Rotating Matter, Angular Velocity, Optical Thickness, Plasma Clouds, Radial Velocity

Scientific paper

The rotation curve of the H I subsystem in the galactic plane has been determined by a method involving the use of the whole 21-cm line profile from Barton's new catalog and contour maps of Kerr and Hindman (1970). For each value of the distance R from the galactic center the most probable angular velocity is selected using the standard relation between the optical depth of the hydrogen column in the direction of galactic longitude, the density, and the radial velocity. Rotation curves obtained for the first and the fourth quadrants differ from other authors' data, presumably due to the departure of hydrogen clouds from the assumption of pure circular motion.

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