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The GD-1 Stellar Stream Perturber as a Core-collapsed Self-interacting Dark Matter Halo
The GD-1 stellar stream exhibits spur and gap structures that may result from a close encounter with a dense substructure. When interpreted as a dark matter subhalo, the perturber is denser than predicted in the standard cold dark matter (CDM) model. In self-interacting dark matter (SIDM), however,
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