Noncircular motion of gas in the spiral galaxy NGC 6643

Details Noncircular motion of gas in the spiral galaxy NGC 6643 Noncircular motion of gas in the spiral galaxy NGC 6643

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67..690s&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, July-Aug. 1990, p. 690-693. In Russian.

Astronomy and Astrophysics

Astronomy

7

Galactic Rotation, Gas Dynamics, Interstellar Gas, Spiral Galaxies, Velocity Distribution, Angular Velocity, Astronomical Models, Galactic Structure

Scientific paper

The velocity field of gas in the spiral galaxy NGC 6643 was analyzed taking into account all possible motions in the galaxy plane. The analysis revealed a bisymmetrical field of peculiar velocities, which can be approximated by a two-armed logarithmic spiral with a twist angle mu = 11.2 + or - 1.7 deg. From this velocity field, a rotation curve was derived, and geometric parameters were determined taking into account all the noncircular velocities in the galaxy plane. The line-of-sight velocity of the NGC 6643 galactic is about 1500 km/s.

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