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Title:
Measuring Dark Matter Substructure with Galaxy-Galaxy Flexion Statistics
Authors:
Bacon, D. J.; Amara, A.; Read, J. I.
Publication:
eprint arXiv:0909.5133
Publication Date:
09/2009
Origin:
ARXIV
Keywords:
Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:
8 pages, 8 figures, submitted to MNRAS
Bibliographic Code:
2009arXiv0909.5133B

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.
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arXiv e-prints