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Measuring dark matter substructure with galaxy-galaxy flexion statistics

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journal contribution
posted on 24.10.2012, 09:06 by A. Amara, J. I. Read
It is of great interest to measure the properties of substructures in dark matter haloes 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; this is a statistical method, requiring many foreground–background pairs of galaxies. We show the effectiveness of flexion variance in measuring substructures in N-body simulations of dark matter haloes, 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 ratio for a space-based all-sky survey, showing that the presence of substructure down to 109 M⊙ haloes can be reliably detected.

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Citation

Monthly Notices of the Royal Astronomical Society , 2010, 409 (1), pp. 389-395

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP)

issn

0035-8711

eissn

1365-2966

Copyright date

2010

Available date

24/10/2012

Publisher version

http://mnras.oxfordjournals.org/content/409/1/389

Language

en

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