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-48590

Nickerson, S; Stinson, G; Couchman, H M P; Bailin, J; Wadsley, J (2011). Mechanisms of baryon loss for dark satellites in cosmological smoothed particle hydrodynamics simulations. Monthly Notices of the Royal Astronomical Society, 415(1):257-270.

[img]
Preview
Accepted Version
PDF
605kB

View at publisher

Abstract

We present a study of satellites in orbit around a high-resolution, smoothed particle hydrodynamics (SPH) galaxy simulated in a cosmological context. The simulated galaxy is approximately of the same mass as the Milky Way. The cumulative number of luminous satellites at z= 0 is similar to the observed system of satellites orbiting the Milky Way although an analysis of the satellite mass function reveals an order of magnitude more dark satellites than luminous satellites. Some of the dark subhaloes are more massive than some of the luminous subhaloes at z= 0. What separates luminous and dark subhaloes is not their mass at z= 0, but the maximum mass the subhaloes ever achieve. We study the effect of four mass-loss mechanisms on the subhaloes: ultraviolet (UV) ionizing radiation, ram-pressure stripping, tidal stripping and stellar feedback, and compare the impact of each of these four mechanisms on the satellites. In the lowest mass subhaloes, UV is responsible for the majority of the baryonic mass-loss. Ram-pressure stripping removes whatever mass remains from the low-mass satellites. More massive subhaloes have deeper potential wells and retain more mass during reionization. However, as satellites pass near the centre of the main halo, tidal forces cause significant mass-loss from satellites of all masses. Satellites that are tidally stripped from the outside can account for the luminous satellites that are of lower mass than some of the dark satellites. Stellar feedback has the greatest impact on medium-mass satellites that had formed stars, but lost all their gas by z= 0. Our results demonstrate that the missing-satellite problem is not an intractable issue with the cold dark matter cosmology, but is rather a manifestation of baryonic processes.

Citations

18 citations in Web of Science®
18 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

22 downloads since deposited on 18 Feb 2012
14 downloads since 12 months

Detailed statistics

Additional indexing

Other titles:Mechanisms of baryon loss for Ddrk satellites in cosmological SPH simulations
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
DDC:530 Physics
Language:English
Date:2011
Deposited On:18 Feb 2012 19:24
Last Modified:18 Dec 2013 10:52
Publisher:Wiley-Blackwell
ISSN:0035-8711 (P) 1365-2966 (E)
Additional Information:The definitive version is available at www3.interscience.wiley.com
Publisher DOI:10.1111/j.1365-2966.2011.18700.x
Related URLs:http://arxiv.org/abs/1103.3285

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

Repository Staff Only: item control page