Measuring Dark Matter Substructure with Galaxy-Galaxy Flexion Statistics
Cosmology and Nongalactic Astrophysics
2015-05-14 v1
Abstract
It is of great interest to measure the properties of substructures in dark matter halos at galactic and cluster scales. Here we suggest a method to constrain substructure properties using the variance of weak gravitational flexion in a galaxy-galaxy lensing context. We show the effectiveness of flexion variance in measuring substructures in N-body simulations of dark matter halos, and present the expected galaxy-galaxy lensing signals. We show the insensitivity of the method to the overall galaxy halo mass, and predict the method's signal-to-noise for a space-based all-sky survey, showing that the presence of substructure down to 10^9 M_\odot halos can be reliably detected.
Cite
@article{arxiv.0909.5133,
title = {Measuring Dark Matter Substructure with Galaxy-Galaxy Flexion Statistics},
author = {D. J. Bacon and A. Amara and J. I. Read},
journal= {arXiv preprint arXiv:0909.5133},
year = {2015}
}
Comments
8 pages, 8 figures, submitted to MNRAS