18-June-2006, 02:00 AM
|
 |
Order of Kilopi
|
|
Join Date: Dec 2002
Location: Upstate New York
Posts: 4,290
|
|
Quote:
|
Originally Posted by Nereid
The observational evidence for (cold, non-baryonic) dark matter can be grouped under the following headings (in the order I propose to address them):
- rich clusters (radial velocity dispersion of member galaxies, the Sunyaez-Zel'dovich effect, (strong) gravitational lensing, X-ray observations)
- galaxy halos (weak lensing, derived orbits of luminous objects in or just outside)
- (spiral) galaxy rotation curves
- CDM in, and near, the Milky Way (really a subset of galaxy rotation curves, but because it's so local, I'll treat it separately)
- poor clusters, galaxy groups (radial velocity dispersions, derived orbits of luminous objects in or near)
- large-scale structure and the CMB (observations provide indirect support for CDM).
If I have missed significant set of observations, that provide direct evidence of CDM, please add.
|
Just to be clear - you intend to show how these provide evidence that the DM must be collisionless CDM specifically? As opposed to Warm DM, Self interacting DM, baryonic DM ... ?
__________________
"The scientist who asks the right question reconnoiters a new patch of the unknown, and may, with luck, bring it within the constricted but expanding boundaries of the known."
~Timothy Ferris (The Red Limit) 1982
|