| Issue |
EAS Publications Series
Volume 20, 2006
Mass Profiles and Shapes of Cosmological Structures
|
|
|---|---|---|
| Page(s) | 19 - 24 | |
| DOI | https://doi.org/10.1051/eas:2006039 | |
| Published online | 19 May 2006 | |
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 19-24
Caustics in dark matter haloes
1
IAP, Institut d'Astrophysique de Paris, 98 bis
Bd. Arago, Paris, France
2
Laboratoire d'Astrophysique, OMP,
14 Av. Edouard Belin, 31400 Toulouse, France
3
Department of Physics and Astronomy, University
of Kansas, KS 66045, USA
4
Department of Physics,
Center for Advanced Mathematical Sciences,
American University of Beirut, Beirut, Lebanon
Caustics are formally singular structures that frequently form in collisionless media. The non-negligible velocity dispersion of dark matter particles renders their density finite. We evaluated the maximum density of the caustics within the framework of secondary infall model of formation of dark matter haloes. The result is then used to demonstrate that caustics can be probed by properly stacking the weak-lensing signal of about 600 haloes. CFHTLS accompanied by X-ray observations and the space-based experiments like SNAP or DUNE can provide us with the required statistics. The extension of our results to more realistic models including the effects of mergers is outlined.
© EAS, EDP Sciences, 2006