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Caustics in dark matter haloes

Published online by Cambridge University Press:  19 May 2006

G.A. Mamon ,
F. Combes ,
C. Deffayet ,
B. Fort ,
R. Mohayaee ,
S. Colombi ,
B. Fort ,
R. Gavazzi ,
S. Shandarin  and
J. Touma
R. Mohayaee
Affiliation:
IAP, Institut d'Astrophysique de Paris, 98 bis Bd. Arago, Paris, France
S. Colombi
Affiliation:
IAP, Institut d'Astrophysique de Paris, 98 bis Bd. Arago, Paris, France
B. Fort
Affiliation:
IAP, Institut d'Astrophysique de Paris, 98 bis Bd. Arago, Paris, France
R. Gavazzi
Affiliation:
Laboratoire d'Astrophysique, OMP, 14 Av. Edouard Belin, 31400 Toulouse, France
S. Shandarin
Affiliation:
Department of Physics and Astronomy, University of Kansas, KS 66045, USA
J. Touma
Affiliation:
Department of Physics, Center for Advanced Mathematical Sciences, American University of Beirut, Beirut, Lebanon
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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.


Type
Research Article
Information
European Astronomical Society Publications Series , Volume 20: Mass Profiles and Shapes of Cosmological Structures , 2006 , pp. 19 - 24
Copyright
© EAS, EDP Sciences, 2006

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