Astrophysics and Space Science

, Volume 156, Issue 1–2, pp 205–208 | Cite as

Formation of leading spiral arms in retrograde galaxy encounters

  • M. Thomasson
  • K. J. Donner
  • B. Sundelius
  • G. G. Byrd
  • T. -Y. Huang
  • M. J. Valtonen
Structure of Spirals and Galaxy Interactions

Abstract

We study, theoretically and withN-body simulations, the formation of spiral structures in retrograde galaxy encounters. A one-armed leading spiral dominates in a disc if (i) the tidal perturbation from the retrograde companion is large enough, and (ii) the disc is surrounded by a massive halo. From the literature we find that very few spirals in a sample of galaxies with a large companion have leading spiral arms. A possible reason for this is that very few spiral galaxies have a halo with a larger mass than the disc mass.

Keywords

Large Mass Spiral Galaxy Spiral Structure Disc Mass Massive Halo 

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • M. Thomasson
    • 1
  • K. J. Donner
    • 2
    • 3
  • B. Sundelius
    • 1
    • 4
  • G. G. Byrd
    • 5
  • T. -Y. Huang
    • 6
    • 7
  • M. J. Valtonen
    • 6
  1. 1.Onsala Space ObservatorySweden
  2. 2.NorditaDenmark
  3. 3.University of HelsinkiFinland
  4. 4.Chalmers University of TechnologySweden
  5. 5.University of AlabamaUSA
  6. 6.University of TurkuFinland
  7. 7.University of NanjingChina

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