Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-19
Astronomy and Astrophysics
Astrophysics
Submitted for publication in MNRAS, 8 pages, 8 figures
Scientific paper
We use large cosmological N-body simulations to study the subhalo population in galaxy group sized halos. In particular, we look for fossil group candidates with typical masses ~10-25% of Virgo cluster but with an order of magnitude less substructure. We examine recent claims that the earliest systems to form are deficient enough in substructure to explain the luminosity function found in fossil groups. Although our simulations show a correlation between the halo formation time and the number of subhalos, the maximum suppression of subhalos is a factor of 2-2.5, whereas a factor of 6 is required to match fossil groups and galaxies. While the number of subhalos depends weakly on the formation time, the slope of the halo substructure velocity function does not. The satellite population within Cold Dark Matter (CDM) halos is self-similar at scales between galaxies and galaxy clusters regardless of mass, whereas current observations show a break in self-similarity at a mass scale corresponding to group of galaxies.
D'Onghia Elena
Lake George
Maccio' Andrea V.
Moore Ben
Stadel Joachim
No associations
LandOfFree
Universal Substructure Distributions in LCDM halos: Can we find a Fossil Group? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Universal Substructure Distributions in LCDM halos: Can we find a Fossil Group?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal Substructure Distributions in LCDM halos: Can we find a Fossil Group? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-573074