Anbajagane, D;
Chang, C;
Banerjee, A;
Abel, T;
Gatti, M;
Ajani, V;
Alarcon, A;
... Wiseman, P; + view all
(2023)
Beyond the 3rd moment: a practical study of using lensing convergence CDFs for cosmology with DES Y3.
Monthly Notices of the Royal Astronomical Society
, 526
(4)
pp. 5530-5554.
10.1093/mnras/stad3118.
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Abstract
Widefield surveys probe clustered scalar fields – such as galaxy counts, lensing potential, etc. – which are sensitive to different cosmological and astrophysical processes. Constraining such processes depends on the statistics that summarize the field. We explore the cumulative distribution function (CDF) as a summary of the galaxy lensing convergence field. Using a suite of N-body light-cone simulations, we show the CDFs’ constraining power is modestly better than the second and third moments, as CDFs approximately capture information from all moments. We study the practical aspects of applying CDFs to data, using the Dark Energy Survey (DES Y3) data as an example, and compute the impact of different systematics on the CDFs. The contributions from the pointspread function and reduced shear approximation are 1 per cent of the totalsignal. Source clustering effects and baryon imprints contribute 1–10 per cent. Enforcing scale cutsto limitsystematics-driven biasesin parameter constraints degrade these constraints a noticeable amount, and this degradation is similar for the CDFs and the moments. We detect correlations between the observed convergence field and the shape noise field at 13σ. The non-Gaussian correlations in the noise field must be modelled accurately to use the CDFs, or other statistics sensitive to all moments, as a rigorous cosmology tool.
| Type: | Article |
|---|---|
| Title: | Beyond the 3rd moment: a practical study of using lensing convergence CDFs for cosmology with DES Y3 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stad3118 |
| Publisher version: | https://doi.org/10.1093/mnras/stad3118 |
| Language: | English |
| Additional information: | Copyright © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Large-scale structure of Universe, cosmology: observations |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10182399 |
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