Does a Galaxy Fly?

Details Does a Galaxy Fly? Does a Galaxy Fly?

2006-08-16

arxiv.org/abs/astro-ph/0608350v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in PASJ

Scientific paper

Disk galaxies in a cluster of galaxies are moving in hot gas filling the cluster. Generally, they are moving at transonic or supersonic velocities. If ram-pressure stripping is insufficient to destroy the gas disk, the galaxies should be affected by the wind of the surrounding hot gas similar to an airfoil. In this paper, I consider whether the aerodynamic interaction can be strong enough to force a disk galaxy to deviate from the orbit that it would have been in. I find that while the lift force is not effective, the drag force could affect face-on disk galaxies in poor clusters on long timescales.

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