Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-08
New Astron.Rev. 46 (2002) 755-766
Astronomy and Astrophysics
Astrophysics
20 pages, 8 figures, submitted to NewA Reviews, review given at MOND workshop, Paris, October 2001
Scientific paper
10.1016/S1387-6473(02)00244-0
An overview is presented of the main properties of dark matter haloes, as we know them from observations, essentially from rotation curves around spiral and dwarf galaxies. Detailed rotation curves are now known for more than a thousand galaxies, revealing that they are not so flat in the outer parts, but rising for late-types, and falling for early-types. A well established result now is that most bright galaxies are not dominated by dark matter inside their optical disks. Only for dwarfs and LSB (Low Surface Brightness galaxies) dark matter plays a dominant role in the visible regions. The 3D-shape of haloes are investigated through several methods, that will be discussed: polar rings, flaring of HI planes, X-ray isophotes. It is not yet possible with rotation curves to know how far haloes extend, but tentatives have been made. It will be shown that the dark matter appears to be coupled to the gas in spirals and dwarfs, suggesting that dark baryons could play the major role in rotation curves. Theories proposing to replace the non-baryonic dark matter by a different dynamical or gravity law, such as MOND, have to take into account the dark baryons, especially since their spatial distribution is likely to be quite different from the visible matter.
No associations
LandOfFree
Properties of Dark Matter Haloes 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 Properties of Dark Matter Haloes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Properties of Dark Matter Haloes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-356065