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Published May 15, 2000 | Published
Journal Article Open

The Dearth of Halo Dwarf Galaxies: Is There Power on Short Scales?


N-body simulations of structure formation with scale-invariant primordial perturbations show significantly more virialized objects of dwarf-galaxy mass in a typical galactic halo than are observed around the Milky Way. We show that the dearth of observed dwarf galaxies could be explained by a dramatic downturn in the power spectrum at small distance scales. This suppression of small-scale power might also help mitigate the disagreement between cuspy simulated halos and smooth observed halos, while remaining consistent with Lyman-alpha-forest constraints on small-scale power. Such a spectrum could arise in inflationary models with broken-scale invariance.

Additional Information

© 2000 The American Physical Society Received 11 November 1999 We thank B. Guiderdoni, B. Moore, J. Peacock, P. Steinhardt, and M. Steinmetz for discussions, and we thank the Isaac Newton Institute for hospitality. M.K. acknowledges the support of the DoE, NSF, NASA, and the Alfred P. Sloan Foundation.

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