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

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. (c) 2000 The American Physical Society.

Authors:
;
Publication Date:
OSTI Identifier:
20216583
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 84; Journal Issue: 20; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GALAXIES; GALACTIC EVOLUTION; MILKY WAY; THEORETICAL DATA

Citation Formats

Kamionkowski, Marc, and Liddle, Andrew R. The Dearth of Halo Dwarf Galaxies: Is There Power on Short Scales?. United States: N. p., 2000. Web. doi:10.1103/PhysRevLett.84.4525.
Kamionkowski, Marc, & Liddle, Andrew R. The Dearth of Halo Dwarf Galaxies: Is There Power on Short Scales?. United States. doi:10.1103/PhysRevLett.84.4525.
Kamionkowski, Marc, and Liddle, Andrew R. Mon . "The Dearth of Halo Dwarf Galaxies: Is There Power on Short Scales?". United States. doi:10.1103/PhysRevLett.84.4525.
@article{osti_20216583,
title = {The Dearth of Halo Dwarf Galaxies: Is There Power on Short Scales?},
author = {Kamionkowski, Marc and Liddle, Andrew R.},
abstractNote = {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. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevLett.84.4525},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 20,
volume = 84,
place = {United States},
year = {2000},
month = {5}
}