J. Sellwood
"Dark Matter Halo Cores"


Barred galaxies require DM halos to have large, low-density cores. I present new evidence to confirm this result, and to rebut recent criticisms. The limits on the characteristic halo density, or concentration index, are much lower than the distributions predicted from popular CDM models. Most current ideas for resolving this discrepancy do not produce a large enough reduction in the central density.

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