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

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

1999-11-06

arxiv.org/abs/astro-ph/9911103v1

Phys.Rev.Lett. 84 (2000) 4525-4528

Astronomy and Astrophysics

Astrophysics

5 pages LaTeX, 3 figures

Scientific paper

10.1103/PhysRevLett.84.4525

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.

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