A tight scaling relation of dark matter in galaxy clusters

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Abstract

Recent studies in different types of galaxies reveal that the product of the central density and the core radius (ρcrc) is a constant. However, some empirical studies involving galaxy clusters suggest that the product ρcrc depends weakly on the total dark halo mass. In this Letter, we re-analyse the hot gas data from 106 clusters and obtain a surprisingly tight scaling relation: ρcαrc-1.46±0.16c. This result generally agrees with the claims that ρcrc is not a constant for all scales of structure. Moreover, this relation does not support the velocity-dependent crosssection of dark matter if the core formation is due to the self-interaction of dark matter. Copyright © 2014 The Author.

Original languageEnglish
Pages (from-to)L14-L17
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume442
Issue number1
Early online date29 Apr 2014
DOIs
Publication statusPublished - 21 Jul 2014

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dark matter
galaxies
scaling
high temperature gases
products
halos
radii
interactions
gas
product

Citation

Chan, M. H. (2014). A tight scaling relation of dark matter in galaxy clusters. Monthly Notices of the Royal Astronomical Society: Letters, 442(1), L14-L17. doi: 10.1093/mnrasl/slu047

Keywords

  • Galaxies
  • Clusters
  • General