The Anisotropic Spatial Distribution of CDM Subhalos
Abstract
I review recent results on the spatial distribution of substructure in CDM halos. I show that the spatial distribution of subhalos is anisotropic and generally prolate with a long axis that is closely aligned with the long axis of the total mass distribution of the host halo. I show that the correlation between the subhalo distribution and the long axis of the host halo is strong both in dissipationless and dissipational gasdynamical simulations. More massive subhalos tend to be more strongly clustered along the major axis of the host halo reflecting filamentary accretion. The anisotropy of subhalos has potential implications for the interpretation of several observations in the Local Group and beyond. For example, I show that while the mean projected mass fraction in substructure in the central regions of CDM halos is fsub \approx 0.4%, fsub is a strong function of projection angle and is ~ 5 to 6 times higher for projections that are nearly collinear with the major axis of the host halo.
Keywords
Cite
@article{arxiv.astro-ph/0510376,
title = {The Anisotropic Spatial Distribution of CDM Subhalos},
author = {Andrew R. Zentner},
journal= {arXiv preprint arXiv:astro-ph/0510376},
year = {2009}
}
Comments
6 pages, 3figures. To appear in the proceedings of the XXIst IAP Colloquium "Mass Profiles and Shapes of Cosmological Structures", Paris July 4-9, 2005, France, Editors G. Mamon, F. Combes, C. Deffayet, B. Fort, EAS Publications Series