The dearth of halo dwarf galaxies: is there power on short scales?

Kamionkowski, Marc and Liddle, Andrew R (2000) The dearth of halo dwarf galaxies: is there power on short scales? Physical Review Letters, 84 (20). pp. 4525-4528. ISSN 00319007

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Abstract

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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Andrew Liddle
Date Deposited: 06 Feb 2012 20:48
Last Modified: 11 Mar 2017 14:42
URI: http://sro.sussex.ac.uk/id/eprint/28224

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