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Title: Three-point galaxy-galaxy lensing as a probe of dark matter halo shapes

Abstract

We propose a method to measure the ellipticities of dark matter halos using the lens-shear-shear 3-point correlation function. This method is immune to effects of galaxy-halo misalignments that can potentially limit 2-point galaxy-galaxy lensing measurements of halo anisotropy. Using a simple model for the projected mass distributions of dark matter halos, we construct an ellipticity estimator that sums over all possible triangular configurations of the 3-point function. By applying our estimator to halos from N-body simulations, we find that systematic errors in the recovered ellipticity will be at the ∼< 5% fractional level. We estimate that future imaging surveys like LSST will have sufficient statistics to detect halo ellipticities using 3-point lensing.

Authors:
; ;  [1]
  1. Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61810 (United States)
Publication Date:
OSTI Identifier:
22382047
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 01; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; CORRELATION FUNCTIONS; ERRORS; GALAXIES; GRAVITATIONAL LENSES; MASS DISTRIBUTION; NONLUMINOUS MATTER; SHAPE; SHEAR; SIMULATION; STATISTICS; TRIANGULAR CONFIGURATION

Citation Formats

Adhikari, Susmita, Chue, Chun Yin Ricky, and Dalal, Neal, E-mail: sadhika2@illinois.edu, E-mail: chue2@illinois.edu, E-mail: dalaln@illinois.edu. Three-point galaxy-galaxy lensing as a probe of dark matter halo shapes. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/01/009.
Adhikari, Susmita, Chue, Chun Yin Ricky, & Dalal, Neal, E-mail: sadhika2@illinois.edu, E-mail: chue2@illinois.edu, E-mail: dalaln@illinois.edu. Three-point galaxy-galaxy lensing as a probe of dark matter halo shapes. United States. doi:10.1088/1475-7516/2015/01/009.
Adhikari, Susmita, Chue, Chun Yin Ricky, and Dalal, Neal, E-mail: sadhika2@illinois.edu, E-mail: chue2@illinois.edu, E-mail: dalaln@illinois.edu. Thu . "Three-point galaxy-galaxy lensing as a probe of dark matter halo shapes". United States. doi:10.1088/1475-7516/2015/01/009.
@article{osti_22382047,
title = {Three-point galaxy-galaxy lensing as a probe of dark matter halo shapes},
author = {Adhikari, Susmita and Chue, Chun Yin Ricky and Dalal, Neal, E-mail: sadhika2@illinois.edu, E-mail: chue2@illinois.edu, E-mail: dalaln@illinois.edu},
abstractNote = {We propose a method to measure the ellipticities of dark matter halos using the lens-shear-shear 3-point correlation function. This method is immune to effects of galaxy-halo misalignments that can potentially limit 2-point galaxy-galaxy lensing measurements of halo anisotropy. Using a simple model for the projected mass distributions of dark matter halos, we construct an ellipticity estimator that sums over all possible triangular configurations of the 3-point function. By applying our estimator to halos from N-body simulations, we find that systematic errors in the recovered ellipticity will be at the ∼< 5% fractional level. We estimate that future imaging surveys like LSST will have sufficient statistics to detect halo ellipticities using 3-point lensing.},
doi = {10.1088/1475-7516/2015/01/009},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 01,
volume = 2015,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}