Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-16
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, using sprocl.sty (included) and psfig.sty. Invited talk at "The Shapes of Galaxies and their Halos," Yale,
Scientific paper
This paper reviews the constraints that can be placed on the shapes of disk galaxies' dark halos using the distribution and kinematics of atomic hydrogen. These data indicate that dark halos are close to axisymmetric, with their axes of symmetry co-aligned with their disk axes. They also appear to be oblate, with shortest-to-longest axis ratios displaying quite a broad range of values from ~0.2 to ~0.8. These results are consistent with the predicted shapes of halos in cold dark matter scenarios, but rule out some of the more exotic dark matter candidates. However, the total number of measurements is still depressingly small, and more data are required if halo shape is to become a powerful diagnostic for theories of galaxy formation and evolution.
No associations
LandOfFree
Halo Tracing with Atomic Hydrogen does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Halo Tracing with Atomic Hydrogen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Halo Tracing with Atomic Hydrogen will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-641784