The redshift evolution of Λ cold dark matter halo parameters: Concentration, spin and shape

J. C. Muñoz-Cuartas, Andrea Maccio, S. Gottlöber, A. A. Dutton

Research output: Contribution to journalArticle

Abstract

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 1015h-1M and redshifts from 0 to 2. We present a series of fitting formulae that accurately describe the time evolution of the concentration-mass (cvir-Mvir) 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 cvir-Mvir 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.

Original languageEnglish (US)
Pages (from-to)584-594
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume411
Issue number1
DOIs
StatePublished - Feb 1 2011

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halos
dark matter
cosmology
cold
parameter
power law
assembly
histories
profiles
history
simulation

Keywords

  • Cosmology: theory
  • Dark matter
  • Galaxies: haloes
  • Gravitation
  • Methods: numerical

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The redshift evolution of Λ cold dark matter halo parameters : Concentration, spin and shape. / Muñoz-Cuartas, J. C.; Maccio, Andrea; Gottlöber, S.; Dutton, A. A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 411, No. 1, 01.02.2011, p. 584-594.

Research output: Contribution to journalArticle

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