| Issue |
|
EAS Publications Series
Volume 20,
2006
Mass Profiles and Shapes of Cosmological Structures
|
|
Page(s)
|
|
19 - 24 |
| DOI |
|
10.1051/eas:2006039 |
| Published online |
|
19 May 2006 |
|
Mass Profiles and Shapes of Cosmological Structures
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 19-24DOI: 10.1051/eas:2006039
Caustics in dark matter haloes
R. Mohayaee1, S. Colombi1, B. Fort1, R. Gavazzi2, S. Shandarin3 and J. Touma4 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
Abstract
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
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