Deep lensing with a twist: E and B modes in a field with multiple lenses

Andrew K. Bradshaw, Myung Kook Jee, J. Anthony Tyson

Research output: Contribution to journalArticle

Abstract

We explore the weak lensing E- and B-mode shear signals of a field of galaxy clusters using both large-scale structure N-body simulations and multicolour Suprime-cam & Hubble Space Telescope observations. Using the ray-traced and observed shears along with photometric redshift catalogues, we generate mass maps of the foreground overdensities by optimally filtering the tangential shear that they induce on background galaxies. We then develop and test a method to approximate the foreground structure as a superposition of Navarro-Frenk- White-like haloes by locating these overdensities and determining their mass and redshift, thereby modelling the background correlated shear field as a sum of lensings induced by the foreground clusters. We demonstrate that the B-mode maps and shear correlation functions, which are generated by similarly filtering the cross shear in this method, are in agreement with observations and are related to the estimated cluster masses and locations as well as the distribution of background sources. Using the foreground mass model, we identify several sources of weak lensing B modes including leakage and edge effects, source clustering, and multiple lensing which can be observed in deep cosmic shear surveys.

LanguageEnglish
Pages1190-1203
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume482
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

lenses
shear
galaxies
cams
edge effect
Hubble Space Telescope
leakage
catalogs
halos
rays
modeling
simulation
method

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

@article{78bdb749ab0f4b66b122f0149983caf3,
title = "Deep lensing with a twist: E and B modes in a field with multiple lenses",
abstract = "We explore the weak lensing E- and B-mode shear signals of a field of galaxy clusters using both large-scale structure N-body simulations and multicolour Suprime-cam & Hubble Space Telescope observations. Using the ray-traced and observed shears along with photometric redshift catalogues, we generate mass maps of the foreground overdensities by optimally filtering the tangential shear that they induce on background galaxies. We then develop and test a method to approximate the foreground structure as a superposition of Navarro-Frenk- White-like haloes by locating these overdensities and determining their mass and redshift, thereby modelling the background correlated shear field as a sum of lensings induced by the foreground clusters. We demonstrate that the B-mode maps and shear correlation functions, which are generated by similarly filtering the cross shear in this method, are in agreement with observations and are related to the estimated cluster masses and locations as well as the distribution of background sources. Using the foreground mass model, we identify several sources of weak lensing B modes including leakage and edge effects, source clustering, and multiple lensing which can be observed in deep cosmic shear surveys.",
author = "Bradshaw, {Andrew K.} and Jee, {Myung Kook} and Tyson, {J. Anthony}",
year = "2019",
month = "1",
day = "1",
doi = "10.1093/mnras/sty2782",
language = "English",
volume = "482",
pages = "1190--1203",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

Deep lensing with a twist : E and B modes in a field with multiple lenses. / Bradshaw, Andrew K.; Jee, Myung Kook; Tyson, J. Anthony.

In: Monthly Notices of the Royal Astronomical Society, Vol. 482, No. 1, 01.01.2019, p. 1190-1203.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Deep lensing with a twist

T2 - Monthly Notices of the Royal Astronomical Society

AU - Bradshaw, Andrew K.

AU - Jee, Myung Kook

AU - Tyson, J. Anthony

PY - 2019/1/1

Y1 - 2019/1/1

N2 - We explore the weak lensing E- and B-mode shear signals of a field of galaxy clusters using both large-scale structure N-body simulations and multicolour Suprime-cam & Hubble Space Telescope observations. Using the ray-traced and observed shears along with photometric redshift catalogues, we generate mass maps of the foreground overdensities by optimally filtering the tangential shear that they induce on background galaxies. We then develop and test a method to approximate the foreground structure as a superposition of Navarro-Frenk- White-like haloes by locating these overdensities and determining their mass and redshift, thereby modelling the background correlated shear field as a sum of lensings induced by the foreground clusters. We demonstrate that the B-mode maps and shear correlation functions, which are generated by similarly filtering the cross shear in this method, are in agreement with observations and are related to the estimated cluster masses and locations as well as the distribution of background sources. Using the foreground mass model, we identify several sources of weak lensing B modes including leakage and edge effects, source clustering, and multiple lensing which can be observed in deep cosmic shear surveys.

AB - We explore the weak lensing E- and B-mode shear signals of a field of galaxy clusters using both large-scale structure N-body simulations and multicolour Suprime-cam & Hubble Space Telescope observations. Using the ray-traced and observed shears along with photometric redshift catalogues, we generate mass maps of the foreground overdensities by optimally filtering the tangential shear that they induce on background galaxies. We then develop and test a method to approximate the foreground structure as a superposition of Navarro-Frenk- White-like haloes by locating these overdensities and determining their mass and redshift, thereby modelling the background correlated shear field as a sum of lensings induced by the foreground clusters. We demonstrate that the B-mode maps and shear correlation functions, which are generated by similarly filtering the cross shear in this method, are in agreement with observations and are related to the estimated cluster masses and locations as well as the distribution of background sources. Using the foreground mass model, we identify several sources of weak lensing B modes including leakage and edge effects, source clustering, and multiple lensing which can be observed in deep cosmic shear surveys.

UR - http://www.scopus.com/inward/record.url?scp=85057155065&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057155065&partnerID=8YFLogxK

U2 - 10.1093/mnras/sty2782

DO - 10.1093/mnras/sty2782

M3 - Article

VL - 482

SP - 1190

EP - 1203

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -