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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/014/01/0019-0035

    • Keywords

       

      interacting galaxies; spiral structure; kinematics and dynamics of galaxies

    • Abstract

       

      The formation of spiral structure in a galaxy, as a result of the gravitational perturbation caused by a permanent companion, is studied. It is found that spiral structure appears only when a resonance exists between the rotational frequency of the stars in the galaxy and the rotational frequency of the companion galaxy. The number of spiral arms depends strongly on the particular resonance. In the case where the companion moves in an elliptic orbit, spiral arms are formed when a resonance, inside the galactic body, exists in almost all the parts of the orbit or, at least, in the largest part of it.

    • Author Affiliations

       

      Ch. L. Vozikis1 N. D. Caranicolas1

      1. Department of Physics, Section of Astrophysics, Astronomy and Mechanics, Aristoteleion University of Thessaloniki, Thessaloniki - 54006, Greece
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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