Structure of Galactic Dark Halos and Observational Prospects for Identifying the Nature of Dark Matter

  • Naoki Yoshida
Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)

We study the internal structure of galactic size dark matter halos in the standard ΛCold Dark Matter model under the assumption that cold dark matter consists of light neutralinos whose annihilation cross section is large.We use high resolution cosmological hydrodynamic simulations which include radiative cooling, starformation and supernova feedback effects. We show that the dissipative processes generally act as steepening the dark matter density profile, whereas supernova feedback mitigates the effect. However, when all of the processes are included, we still find many subhalos that have a steep (αr –1.5–2) density profiles. Such subhalos may be bright sources of γ-ray via pair-annihilation of neutralinos. We also find poor correlation between the stellar velocity dispersion profile and the underlying dark matter density profiles of subhalos. Observations of stellar velocity dispersions need to be interpreted with caution.


Radiative Cool Cold Dark Matter Dark Matter Particle Annihilation Cross Section Dark Matter Annihilation 
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  1. 1.
    G. Bertone, D. Hooper, J. Silk  Physics Reports, 405, 279 (2005)CrossRefADSGoogle Scholar
  2. 2.
    L. Bergstrom, P. Ullio, J. H. Buckley. Astroparticle Physics, 9, 137 (1998)CrossRefADSGoogle Scholar
  3. 3.
    V. Springel : MNRAS, 6, 79 (2005)Google Scholar
  4. 4.
    F. Stoehr, S. D. M. White, V. Springel, G. Tormen, N. Yoshida : MNRAS, 345, 1313 (2003)CrossRefADSGoogle Scholar
  5. 5.
    Wilkinson, M. I. et al. : preprint astro-ph/0602186Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Naoki Yoshida
    • 1
  1. 1.Department of PhysicsNagoya UniversityChikusa-kuJapan

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