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Formation of leading spiral arms in retrograde galaxy encounters
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- Thomasson, Magnus, 1961 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
- Donner, K.J. (author)
- Sundelius, B. (author)
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- Byrd, G.G. (author)
- Huang, T.-Y. (author)
- Valtonen, M.J. (author)
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- (creator_code:org_t)
- 1989
- 1989
- English.
- In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 211:1, s. 25-36
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The formation of spiral structures in retrograde galaxy encounters was studied theoretically and with N-body simulations. A one-armed leading spiral dominates in a disk if the tidal perturbation from the retrograde companion is large enough, and the disk is surrounded by a massive halo. The leading arm is made up of particles in slightly elongated orbits, the turning points of which outline the arm. The orbits precess in such a way that the arm structure survives while it rotates in the opposite sense to the disk rotation. From the literature it is found 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 larger mass than the disk mass.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: kinematics and dynamics of
- galaxies: structure of
- galaxies: spiral
Publication and Content Type
- art (subject category)
- ref (subject category)
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