Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 409, Issue 1, Pages 389-395Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2010.17316.x
Keywords
cosmology: observations; dark matter; gravitational lensing: weak
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Funding
- RCUK
- ETH Zurich
- STFC [ST/H002774/1, ST/F002335/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002335/1, PPA/A/R/2003/00274/2, ST/H002774/1] Funding Source: researchfish
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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 10(9)M(circle dot) haloes can be reliably detected.
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