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• W2908398280 abstract "We test the ability of strong lensing data to constrain the size of a central core in the dark matter haloes of galaxy clusters, using Abell 611 as a prototype. Using simulated data, we show that modelling a cluster halo with ellipticity in the gravitational potential can bias the inferred mass and concentration, which may bias the inferred central density when weak lensing or X-ray data are added. We also highlight the possibility for spurious constraints on the core size if the radial density profile is different from the assumed model. These systematics can be ameliorated if central images are present in the data. Applying our methodology to Abell 611 and imposing a reasonable prior on the stellar mass-to-light ratio restricts the core size to be less than about 4 kpc, with a minimum reduced χ2 of 0.28, and with RMS error of 0|${^{primeprime}_{.}}$|12 in image positions. Such small cores imply a constraint on the dark matter self-interaction cross section of the order of |$0.1 mathrm{cm^2, g}^{-1}$| at relative velocities of about 1500 km s−1. In addition, our results imply a bottom-heavy (super-Salpeter) initial mass function for the central galaxy in the Abell 611." @default.
• W2908398280 created "2019-01-11" @default.
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• W2908398280 date "2019-05-17" @default.
• W2908398280 modified "2023-09-30" @default.
• W2908398280 title "Detecting dark matter cores in galaxy clusters with strong lensing" @default.
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• W2908398280 doi "https://doi.org/10.1093/mnras/stz1360" @default.
• W2908398280 hasPublicationYear "2019" @default.
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