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• W3100376143 abstract "We carry out ray tracing through five high-resolution simulations of a galaxy cluster, to study how its ability to produce giant gravitationally lensed arcs is influenced by the collision cross-section of its dark matter. In three cases typical dark matter particles in the cluster core undergo between 1 and 100 collisions per Hubble time; two more explore the long (‘collisionless’) and short (‘fluid’) mean free path limits. We study the size and shape distributions of arcs and compute the cross-section for producing ‘extreme’ arcs of various sizes. Even a few collisions per particle modifies the core structure enough to destroy the ability of the cluster to produce long, thin arcs. For larger collision frequencies the cluster must be scaled up to unrealistically large masses before it regains the ability to produce giant arcs. None of our models with self-interacting dark matter (except the ‘fluid’ limit) is able to produce radial arcs; even the case with the smallest scattering cross-section must be scaled to the upper limit of observed cluster masses before it produces radial arcs. Apparently the elastic collision cross-section of dark matter in clusters must be very small, below 0.1 cm2 g−1, to be compatible with the observed ability of clusters to produce both radial arcs and giant arcs." @default.
• W3100376143 created "2020-11-23" @default.
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• W3100376143 date "2001-07-11" @default.
• W3100376143 modified "2023-10-17" @default.
• W3100376143 title "Giant cluster arcs as a constraint on the scattering cross-section of dark matter" @default.
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• W3100376143 doi "https://doi.org/10.1046/j.1365-8711.2001.04477.x" @default.
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