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On the understanding of the observed flat or slowly rising rotation curves in large disk galaxies

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Abstract

Recent observations of the rotation curves of large disk galaxies of all Hubble-types have shown that they possess flat or slowly rising rotation curves up to large distances from the centre. It has been suggested here that such rotation curves are understood under normal fluid dynamical considerations provided that viscous (and/or magnetic) transfer of mass and angular momentum from inner to outer regions of these galaxies is efficient. Flow of gas from halo to the disk in regions close to the axis of rotation is also suggested. The existence of rising rotation curves in some galaxies with varying gradients and flat rotation curves in others suggest that probably these galaxies are not coeval. The formers are probably of more recent origin.

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Authors and Affiliations

  1. Department of Applied Mathematics, University of Calcutta, India

    Mita Ghosh & B. Basu

  2. Department of Mathematics, Jogamaya Devi College, Calcuta, India

    Tara Bhattacharyya

Authors
  1. Mita Ghosh
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  2. B. Basu
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  3. Tara Bhattacharyya
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Ghosh, M., Basu, B. & Bhattacharyya, T. On the understanding of the observed flat or slowly rising rotation curves in large disk galaxies. Astrophys Space Sci 152, 131–139 (1989). https://doi.org/10.1007/BF00645993

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  • DOI: https://doi.org/10.1007/BF00645993

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