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19 April 2024 |
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On the cross-section of Dark Matter using substructure infall into galaxy clusters | | David Harvey
; Eric Tittley
; Richard Massey
; Thomas D. Kitching
; Andy Taylor
; Simon R. Pike
; Scott T. Kay
; Erwin T. Lau
; Daisuke Nagai
; | | Date: |
7 Oct 2013 | | Abstract: | We develop a statistical method to measure the interaction cross-section of
Dark Matter, exploiting the continuous minor merger events in which small
substructures fall into galaxy clusters. We find that by taking the ration of
the distances between the galaxies and Dark Matter, and galaxies and gas in
accreting sub-halos, we are able to calibrate and measure the Dark Matter
self-interaction cross-section, remove any inherent line-of-sight projections.
In order to interpret this ratio as a cross-section of Dark Matter we derive an
analytical description of sub-halo infall which encompasses; the force of the
main cluster potential, the drag on a gas sub-halo, a model for Dark Matter
self-interactions and the resulting sub-halo drag, the force on the gas and
galaxies due to the Dark Matter sub-halo potential, and finally the buoyancy on
the gas and Dark Matter. We create mock observations from cosmological
simulations of structure formation and find that collisionless Dark Matter
becomes physically separated from X-ray gas by up to 20h^-1 kpc. Adding
realistic levels of noise, we are able to predict achievable constraints from
observational data. Current archival data should be able to detect a difference
in the dynamical behaviour of Dark Matter and standard model particles at 6
sigma, and measure the total interaction cross-section sigma/m with 68%
confidence limits of +/- 1cm2g^-1. This is already better by a factor of 2 than
the Bullet Cluster, if one considers a more detailed description of Dark Matter
interactions. Furthermore, it is not restricted by the limited number of major
merging events and is easily extended to large samples of clusters from future
surveys which could potentially push statistical errors to 0.1cm^2g^-1. | | Source: | arXiv, 1310.1731 | | Services: | Forum | Review | PDF | Favorites | |
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