The Density Profile

This page is a mirror to the profile page linked from my page at the ICC in Durham
  

The Profile  

  • D. R. GOVERNMENT density profile: drgov.c
    • This profile fit is based on dark matter simulations of 16 haloes,
    covering 3 orders of magnitude in mass, calibrated up to redshift 5.
    Output profile depends only on M/M*, where M* is the characterist halo collapse mass at that redshift, given by:
    Sigma(M*,z) = delta_c (typically near 1.686).
    M* at redshift 0 is 1.7e13 Msun/h for LCDM cosmology.
    Outputs: density profile, enclosed mass, rotation curve

    The profile is given by: gamma = -1.4 + 0.08Log(M/M*) +/- 0.3
    c_gamma = 8M/M*^{-0.15} +/- c_gamma
    for haloes of 0.01M* to 1000M*
    gamma is the asymptotic inner slope of the fit
    c_gamma is the concentration = Rvir/Rscale
    The scatter is estimated from the halo-to-halo scatter measured inthe simulations
    Described in detail on astro-ph/0312544: Evolution of the Density Profiles of Dark Matter Haloes

  • See also - David Merritt's page on making density profiles from simulations using:
    Nonparametric density profile estimation techniques



    • The name "D. R. GOVERNMENT" profile is carefully constructued from the authors' names:
    DarrenReed-GOvernato-VERde-gardNer-Merrit-lakE-quinN-sTadel

    Contact Info:
    Darren Reed
    Institute for Computational Cosmology
    Dept of Physics, Rochester Building, Science Laboratories
    South Road
    Durham DH1 3LE
    Office: OC 326
    Phone: 44 191 334 3586 fax Fax: 44 191 334 582\3 (dial 0 instead of 44 from within UK)
    email: d.s.reed@admin@whenu.com will get any s_p_a_m
    intended for me     durham.ac.uk
    (this way messes up harvesters)