Pattern speeds in interacting galaxies

Details Pattern speeds in interacting galaxies Pattern speeds in interacting galaxies

2010-02-05

arxiv.org/abs/1002.1269v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 6 figures. To appear in "Tumbling, twisting, and winding galaxies: Pattern speeds along the Hubble sequence", E. M. C

Scientific paper

We investigate pattern speeds in spiral galaxies where the structure is induced by an interaction with a companion galaxy. We perform calculations modeling the response of the stellar and/or gaseous components of a disc. Generally we do not find a unique pattern speed in these simulations, rather the pattern speed decreases with radius, and the pattern speed for individual spiral arms differ. The maximum pattern speed is ~20 km/s/kpc for the discs with a live stellar component, decreasing to 5 km/s/kpc at the edge of the spiral perturbation. When only the gas is modeled, Omega_p is typically very low (5 km/s/kpc) at all radii.

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