Measuring Dark Matter Substructure with Galaxy-Galaxy Flexion Statistics - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: It is of great interest to measure the properties of substructures in darkmatter halos at galactic and cluster scales. Here we suggest a method toconstrain substructure properties using the variance of weak gravitationalflexion in a galaxy-galaxy lensing context. We show the effectiveness offlexion variance in measuring substructures in N-body simulations of darkmatter halos, and present the expected galaxy-galaxy lensing signals. We showthe insensitivity of the method to the overall galaxy halo mass, and predictthe method-s signal-to-noise for a space-based all-sky survey, showing that thepresence of substructure down to 10^9 M \odot halos can be reliably detected.



Autor: D. J. Bacon, A. Amara, J. I. Read

Fuente: https://arxiv.org/







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