Home
| VOLUME 96 (2012) | ISSUE 12 | PAGE 844 |
|---|
|
Resolving infall caustics in dark matter halos
K. Dolag, A. D. Dolgov+*×°, I. I. Tkachev+∇
University Observatory Munich, 81679 München, Germany Max-Planck-Institut für Astrophysik, 85748 Garching bei München, Germany +Laboratory of Cosmology and Elementary Particles, Novosibirsk State University, 630090 Novosibirsk, Russia *Dipartimento di Fisica, Universit`a degli Studi di Ferrara, Polo Scientico e Tecnologico - Edicio C, 44122 Ferrara, Italy ×Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Polo Scientico e Tecnologico - Edicio C, 44122 Ferrara, Italy °Alikhanov Institute of Theoretical and Experimental Physics, 117218 Moscow, Russia ∇Institute for Nuclear Research of the RAS, 117312 Moscow, Russia
Abstract
We have found that the phase-space of a dark matter particles assembling a galactic halo in cosmological N-body simulations has well defined fine grained structure. Recently accreted particles form distinctive velocity streams with high density contrast. For fixed observer position these streams lead to peaks in velocity distribution. Overall structure is close to that emerging in the secondary infall model. |