Cited by 9,917Galaxies: Formation, Evolution, PhenomenaCosmology and Gravitation TheoriesDark Matter and Cosmic Phenomena

A Universal Density Profile from Hierarchical Clustering

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Navarro, Julio F., Frenk, Carlos S., White, Simon D. M.·1997·The Astrophysical Journal

Abstract

We use high-resolution N -body simulations to study the equilibrium density profiles of dark matter halos in hierarchically clustering universes. We find that all such profiles have the same shape, independent of the halo mass, the initial density fluctuation spectrum, and the values of the cosmological parameters. Spherically averaged equilibrium profiles are well fitted over two decades in radius by a simple formula originally proposed to describe the structure of galaxy clusters in a cold dark matter universe. In any particular cosmology, the two scale parameters of the fit, the halo mass and its characteristic density, are strongly correlated. Low-mass halos are significantly denser than more massive systems, a correlation that reflects the higher collapse redshift of small halos. The characteristic density of an equilibrium halo is proportional to the density of the universe at the time it was assembled. A suitable definition of this assembly time allows the same proportionality constant to be used for all the cosmologies that we have tested. We compare our results with previous work on halo density profiles and show that there is good agreement. We also provide a step-by-step analytic procedure, based on the Press-Schechter formalism, that allows accurate equilibrium profiles to be calculated as a function of mass in any hierarchical model.

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  1. E. 1985, ApJS, 58, Bertschinger, 39 S., & Lacey, C. 1996, MNRAS, in press (astro-ph Cole, 9510147)

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Authors
Navarro, J. F., Frenk, C. S., & White, S. D. M.
Affiliations
  • University of Arizona (US)
  • Durham University (GB)
  • Max Planck Institute for Astrophysics (DE)
Venue
The Astrophysical Journal
Published
1997-12
Volume
490
Issue
2
Pages
493-508
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2060003036
Cited by
9,917
References
24
Citations by year
2026: 372 · 2025: 519 · 2024: 443 · 2023: 441 · 2022: 452 · 2021: 462 · 2020: 435 · 2019: 433 · 2018: 428 · 2017: 413 · 2016: 488 · 2015: 412 · 2014: 379 · 2013: 380 · 2012: 403
FWCI
88.09
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Durham Research Online (Durham University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
Keywords
dark matter halos, hierarchical clustering, halo mass, cosmological parameters, Press-Schechter formalism, cold dark matter, galaxy clusters

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