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Constrained Simulations of Dark Matter Halos

Published online by Cambridge University Press:  19 May 2006

Y. Hoffman
Affiliation:
Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
E. Romano-Díaz
Affiliation:
Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
A. Faltenbacher
Affiliation:
Physics Department, University of California, Santa Cruz, CA 95064, USA
D. Jones
Affiliation:
Dept. of Physics & Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA
C. Heller
Affiliation:
Department of Physics, Georgia Southern University, Statesboro, GA 30460, USA
I. Shlosman
Affiliation:
Dept. of Physics & Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA
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Abstract


The formation and structure of dark matter halos is studied by constrained simulations. A series of experiments of the formation of a 1012h-1 M halo is designed to study the dependence of the density profile on its merging history. We find that the halo growth consist of several quiescent phases intermitted by violent events, with the density well approximated by the NFW profile during the former phases. We find that (1) the NFW scale radius Rs  stays constant during the quiescent phase and grows abruptly during the violent one. In contrast, the virial radius grows linearly during the quiescent and abruptly during the violent phases. (2) The central density stays unchanged during the quiescent phase while dropping abruptly during the violent phase, and it does not reflect the formation time of the halo. (3) The clear separation of the evolution of an individual halo into quiescent and violent phases implies that its entire evolution cannot be fitted by simple scaling relations.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2006

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