Christopher Thomas Davies christopher.t.davies@durham.ac.uk
PGR Student Doctor of Philosophy
Optimal void finders in weak lensing maps
Davies, Christopher T; Paillas, Enrique; Cautun, Marius; Li, Baojiu
Authors
Enrique Paillas
Marius Cautun
Professor Baojiu Li baojiu.li@durham.ac.uk
Professor
Abstract
Cosmic voids are a key component of the large-scale structure that contain a plethora of cosmological information. Typically, voids are identified from the underlying galaxy distribution, which is a biased tracer of the total matter field. Previous works have shown that 2D voids identified in weak lensing (WL) maps – WL voids – correspond better to true underdense regions along the line of sight. In this work, we study how the properties of WL voids depend on the choice of void finder, by adapting several popular void finders. We present and discuss the differences between identifying voids directly in the convergence maps, and in the distribution of WL peaks. Particular effort has been made to test how these results are affected by galaxy shape noise (GSN), which is a dominant source of noise in WL observations. By studying the signal-to-noise ratios (S/N) for the tangential shear profile of each void finder, we find that voids identified directly in the convergence maps have the highest S/N but are also the ones most affected by GSN. Troughs are least affected by noise, but also have the lowest S/N. The tunnel algorithm, which identifies voids in the distribution of WL peaks, represents a good compromise between finding a large tangential shear S/N and mitigating the effect of GSN.
Citation
Davies, C. T., Paillas, E., Cautun, M., & Li, B. (2021). Optimal void finders in weak lensing maps. Monthly Notices of the Royal Astronomical Society, 500(2), 2417-2439. https://doi.org/10.1093/mnras/staa3262
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 28, 2020 |
Online Publication Date | Oct 27, 2020 |
Publication Date | 2021-01 |
Deposit Date | Jun 29, 2021 |
Publicly Available Date | Jun 29, 2021 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 500 |
Issue | 2 |
Pages | 2417-2439 |
DOI | https://doi.org/10.1093/mnras/staa3262 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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