Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive 

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-16552

Diemand, J; Kuhlen, M; Madau, P; Zemp, M; Moore, B; Potter, D; Stadel, J (2008). Clumps and streams in the local dark matter distribution. Nature, 454(7205):735-738.

[img]
Preview
Accepted Version
PDF (Accepted manuscript, Version 2)
203Kb
[img]
Preview
PDF (Accpeted manuscript, Version 1)
181Kb

Abstract

In cold dark matter cosmological models1,2, structures form and grow through the merging of smaller units3. Numerical simulations have shown that such merging is incomplete; the inner cores of haloes survive and orbit as ‘subhaloes’ within their hosts4,5. Here we report a simulation that resolves such substructure even in the very inner regions of the Galactic halo. We find hundreds of very
concentrated dark matter clumps surviving near the solar circle, as well as numerous cold streams. The simulation also reveals the fractal nature of dark matter clustering: isolated haloes and subhaloes contain the same relative amount of substructure and both have cusped inner density profiles. The inner mass and phasespace densities of subhaloes match those of recently discovered faint, dark-matter-dominated dwarf satellite galaxies6–8, and the
overall amount of substructure can explain the anomalous flux ratios seen in strong gravitational lenses9,10. Subhaloes boost c-ray production from dark matter annihilation by factors of 4 to 15 relative to smooth galactic models. Local cosmic ray production is also enhanced, typically by a factor of 1.4 but by a factor of
more than 10 in one per cent of locations lying sufficiently close to a large subhalo. (These estimates assume that the gravitational effects of baryons on dark matter substructure are small.)

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Theoretical Physics
DDC:530 Physics
Language:English
Date:August 2008
Deposited On:10 Mar 2009 17:42
Last Modified:11 Apr 2014 08:48
Publisher:Nature Publishing Group
ISSN:0028-0836
Publisher DOI:10.1038/nature07153
Related URLs:http://arxiv.org/abs/0805.1244
Citations:Web of Science®. Times Cited: 331
Google Scholar™

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page