Weak lensing by voids in weak lensing maps

Davies, Christopher T.; Cautun, Marius; Li, Baojiu

Abstract

Cosmic voids are an important probe of large-scale structure that can constrain cosmological parameters and test cosmological models. We present a new paradigm for void studies: void detection in weak lensing convergence maps. This approach identifies objects that relate directly to our theoretical understanding of voids as underdensities in the total matter field and presents several advantages compared to the customary method of finding voids in the galaxy distribution. We exemplify this approach by identifying voids using the weak lensing peaks as tracers of the large-scale structure. We find self-similarity in the void abundance across a range of peak signal-to-noise selection thresholds. The voids obtained via this approach give a tangential shear signal up to ∼40 times larger than voids identified in the galaxy distribution.

Citation

Davies, C. T., Cautun, M., & Li, B. (2018). Weak lensing by voids in weak lensing maps. Monthly Notices of the Royal Astronomical Society: Letters, 480(1), L101-L105. https://doi.org/10.1093/mnrasl/sly135

• Journal Article Type: Article
• Acceptance Date: Jul 17, 2018
• Online Publication Date: Jul 25, 2018
• Publication Date: Oct 11, 2018
• Deposit Date: Jul 27, 2018
• Publicly Available Date: Aug 3, 2018
• Journal: Monthly Notices of the Royal Astronomical Society: Letters
• Electronic ISSN: 1745-3933
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 480
• Issue: 1
• Pages: L101-L105
• DOI: https://doi.org/10.1093/mnrasl/sly135
• Public URL: https://durham-repository.worktribe.com/output/1320174
• Related Public URLs: https://arxiv.org/abs/1803.08717