Formation of leading spiral arms in retrograde galaxy encounters

Details Formation of leading spiral arms in retrograde galaxy encounters Formation of leading spiral arms in retrograde galaxy encounters

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...211...25t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 211, no. 1, Feb. 1989, p. 25-36. Research supported by NSF.

Astronomy and Astrophysics

Astrophysics

37

Encounters, Galactic Structure, Many Body Problem, Spiral Galaxies, Galactic Evolution, Galactic Rotation, Orbital Resonances (Celestial Mechanics), Perturbation

Scientific paper

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.

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