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

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.156..205t&link_type=abstract

Astrophysics and Space Science, Volume 156, Issue 1-2, pp. 205-208

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

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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