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The kinematic effects on the rotation curve of a galaxy

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Abstract

In this paper, it is pointed out that if the 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.

The kinematic effects on rotation curve are calculated. The additional velocity caused by revolving about the common centre is obtained. In case the direction of revolution is opposite (or consistent) to the direction of rotation, then in the outer region of nucleus, a flat rotation curve could be changed to a constant negative (or postive) gradient. The 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 109 years. The tidal force is always less than gravitating force, so the system could be maintained in such a revolving cases. At last, rotation curves in all directions of disk are suggested to pick out the kinematic effects from pure rotation.

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Authors and Affiliations

  1. Department of Physics, Fudan University, Shanghai, China

    Chongming Xu & Xuejun Wu

Authors
  1. Chongming Xu
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  2. Xuejun Wu
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Additional information

Work supported by the National Science Foundation of China, under Grant No. 1860610.

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Xu, C., Wu, X. The kinematic effects on the rotation curve of a galaxy. Astrophys Space Sci 141, 389–398 (1988). https://doi.org/10.1007/BF00639504

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  • DOI: https://doi.org/10.1007/BF00639504

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