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Formation of leading spiral arms in retrograde galaxy encounters

Magnus Thomasson (Onsala Rymdobservatorium) ; K.J. Donner ; B. Sundelius ; G.G. Byrd ; T.-Y. Huang ; M.J. Valtonen
Astronomy and Astrophysics (0004-6361). Vol. 211 (1989), 1, p. 25-36.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: galaxies: spiral, galaxies: structure of, galaxies: kinematics and dynamics of

Denna post skapades 2014-10-17.
CPL Pubid: 204462


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Institutioner (Chalmers)

Onsala Rymdobservatorium (1900-2004)


Astronomi, astrofysik och kosmologi
Extragalaktisk astronomi

Chalmers infrastruktur

Onsala rymdobservatorium