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.
|Journal||Monthly Notices of the Royal Astronomical Society: Letters|
|Early online date||29 Apr 2014|
|Publication status||Published - 21 Jul 2014|
CitationChan, 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