The Observed Properties of Dark Matter on Small Astrophysical Scales

Physics

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Scientific paper

There has long been evidence that low-mass galaxies are systematically larger, of lower central mass density, and of lower central phase-space density, than are star clusters with a similar number of stars. There is also suggestive evidence that there is a minimum mass for the dark halos associated with small galaxies. Evidence to support all these relations is becoming stronger. We reconcile the minimum size, minimum mass, low mass density and low phase-space density relationships, showing they are aspects of a more fundamental pair of intrinsic properties of dark matter itself. Dark matter clusters such that there is a maximum volume mass density, which has the very low value of about 20GeV /c2 cm-3 (about 0.5M&sun; pc-3), and there is an associated shallow density profile (core) in the mass distribution, with a characteristic length scale of order 5×l018m (≈ 150pc). Even a cusp density profile leads to an interestingly low maximum central mass density of ~ 1TeV/c2 cm-3.

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