Effect of dark matter halo substructures on galaxy rotation curves
Abstract
The effect of halo substructures on galaxy rotation curves is investigated in this paper using a simple model of dark matter clustering. A dark matter halo density profile is developed based only on the scale free nature of clustering that leads to a statistically self-similar distribution of the substructures at galactic scale. Semi-analytical method is used to derive rotation curves for such a clumpy dark matter density profile. It is found that the halo substructures significantly affect the galaxy velocity field. Based on the fractal geometry of the halo, this self-consistent model predicts an NFW-like rotation curve and a scale free power spectrum of the rotation velocity fluctuations.
Keywords
Cite
@article{arxiv.1009.2099,
title = {Effect of dark matter halo substructures on galaxy rotation curves},
author = {Nirupam Roy},
journal= {arXiv preprint arXiv:1009.2099},
year = {2012}
}
Comments
6 pages, 3 figures. Accepted for publication in ApJ. The definitive version will be available at http://iopscience.iop.org/