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

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posted on 2023-06-08, 07:53 authored by Marc Kamionkowski, Andrew R Liddle
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review Letters

ISSN

00319007

Publisher

Physical Review Letters

Issue

20

Volume

84

Page range

4525-4528

ISBN

0031-9007

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2016-11-10

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