Journal Article

The redshift evolution of <i>Λ</i> cold dark matter halo parameters: concentration, spin and shape

J. C. Muñoz-Cuartas, A. V. Macciò, S. Gottlöber and A. A. Dutton

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 1, pages 584-594
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17704.x
The redshift evolution of Λ cold dark matter halo parameters: concentration, spin and shape

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We present a detailed study of the redshift evolution of dark matter halo structural parameters in a Λ cold dark matter cosmology. We study the mass and redshift dependence of the concentration, shape and spin parameter in N-body simulations spanning masses from 1010 to 1015 h−1 M and redshifts from 0 to 2. We present a series of fitting formulae that accurately describe the time evolution of the concentration–mass (cvirMvir) relation since z= 2. Using arguments based on the spherical collapse model, we study the behaviour of the scalelength of the density profile during the assembly history of haloes, obtaining physical insights into the origin of the observed time evolution of the cvirMvir relation. We also investigate the evolution with redshift of dark matter halo shape and its dependence on mass. Within the studied redshift range, the relation between the halo shape and mass can be well fitted by a redshift-dependent power law. Finally we show that although for z= 0 the spin parameter is practically mass independent, at increasing redshift it shows an increasing correlation with mass.

Keywords: gravitation; methods: numerical; galaxies: haloes; cosmology: theory; dark matter

Journal Article.  8692 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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