Halo properties in cosmological simulations of self-interacting cold dark matter

Romeel S Dave, David N. Spergel, Paul J. Steinhardt, Benjamin D. Wandelt

Research output: Contribution to journalArticle

217 Citations (Scopus)

Abstract

We present a comparison of halo properties in cosmological simulations of collisionless cold dark matter (CDM) and self-interacting dark matter (SIDM) for a range of dark matter cross sections. We find, in agreement with various authors, that CDM yields cuspy halos that are too centrally concentrated as compared to observations. Conversely, SIDM simulations using a Monte Carlo N-body technique produce halos with significantly reduced central densities and flatter cores. We introduce a concentration parameter based on enclosed mass that we expect will be straightforward to determine observationally and present predictions for SIDM and CDM. SIDM also produces more spherical halos than CDM, providing possibly the strongest observational constraint on SIDM. In our simulations with SIDM cross sections σDM ≈ 10-23 to 10-25 cm2 GeV-1, collisions reduce the central density in galaxy halos, with larger cross sections producing lower densities. Simulations in the upper end of this range best match current observations of galaxy properties but are disfavored by cluster simulations of Yoshida and colleagues. This problem would be alleviated in models in which the cross section is velocity dependent.

Original languageEnglish (US)
Pages (from-to)574-589
Number of pages16
JournalAstrophysical Journal
Volume547
Issue number2 PART 1
DOIs
StatePublished - Feb 1 2001
Externally publishedYes

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halos
dark matter
simulation
cross section
cross sections
cold
galaxies
collision
collisions
prediction
predictions

Keywords

  • Cosmology: theory
  • Dark matter
  • Galaxies: formation
  • Galaxies: halos
  • Methods: n-body simulations

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Halo properties in cosmological simulations of self-interacting cold dark matter. / Dave, Romeel S; Spergel, David N.; Steinhardt, Paul J.; Wandelt, Benjamin D.

In: Astrophysical Journal, Vol. 547, No. 2 PART 1, 01.02.2001, p. 574-589.

Research output: Contribution to journalArticle

Dave, RS, Spergel, DN, Steinhardt, PJ & Wandelt, BD 2001, 'Halo properties in cosmological simulations of self-interacting cold dark matter', Astrophysical Journal, vol. 547, no. 2 PART 1, pp. 574-589. https://doi.org/10.1086/318417
Dave, Romeel S ; Spergel, David N. ; Steinhardt, Paul J. ; Wandelt, Benjamin D. / Halo properties in cosmological simulations of self-interacting cold dark matter. In: Astrophysical Journal. 2001 ; Vol. 547, No. 2 PART 1. pp. 574-589.
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