A model for lopsided galactic disks

Details A model for lopsided galactic disks A model for lopsided galactic disks

1998-03-12

arxiv.org/abs/astro-ph/9803146v1

Astronomy and Astrophysics

Astrophysics

10 pages and 2 figures, AASTEX (aaspp4), to appear in ApJL

Scientific paper

10.1086/311239

Many disk galaxies are lopsided: their brightest inner parts are displaced from the center of the outer isophotes, or the outer contours of the HI disk. This asymmetry is particularly common in small, low-luminosity galaxies. We argue here that long-lived lopsidedness is a consequence of the disk lying off-center in the potential of the galaxy's extended dark halo, and spinning in a sense retrograde to its orbit about the halo center. The stellar velocity field predicted by our gravitational N-body simulations is clearly asymmetric.

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