Formation of leading spiral arms in retrograde galaxy encounters |
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| Authors: | M Thomasson K J Donner B Sundelius G G Byrd T -Y Huang M J Valtonen |
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| Institution: | (1) Onsala Space Observatory, Sweden;(2) Nordita, Denmark;(3) University of Helsinki, Finland;(4) Chalmers University of Technology, Sweden;(5) University of Alabama, USA;(6) University of Turku, Finland;(7) University of Nanjing, China |
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| 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. |
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