The kinematic effects on the rotation curve of a galaxy

Details The kinematic effects on the rotation curve of a galaxy The kinematic effects on the rotation curve of a galaxy

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.141..389x&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 141, no. 2, Feb. 1988, p. 389-398. Research supported by the National Scie

Astronomy and Astrophysics

Astrophysics

1

Angular Velocity, Galactic Rotation, Kinematics, Spiral Galaxies, Center Of Mass, Curves, Dark Matter, Line Of Sight

Scientific paper

In this paper, it is pointed out that if a spiral galaxy revolves about some common centre as a whole, the rotation curve will be changed by the kinematic effects. The common centre could be the centre of supercluster or the centre of dark matter and luminous matter. 44 rotation curves of Sb and Sc galaxies are expressed by means of linear least-squares fit, from which the period of revolving and the ratio of tidal force to self-gravitating force are calculated for every galaxy in extreme cases. The periods for most galaxies are in the reasonable region about 109years. The tidal force is always less than the gravitating force, so the system could be maintained in such a revolving case. At least, rotation curves in all directions of the disk are suggested to pick out the kinematic effects from pure rotation.

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