A Model for Lopsided Galactic Disks

Stephen E. Levine, Linda S. Sparke
1998 Astrophysical Journal  
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
more » ... ur gravitational N-body simulations is clearly asymmetric.
doi:10.1086/311239 fatcat:o2oxkffn5rbvfpfji6rg5gpqn4