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A unified catalogue-level reanalysis of stage-III cosmic shear surveys

Publication ,  Journal Article
Longley, EP; Chang, C; Walter, CW; Zuntz, J; Ishak, M; Mandelbaum, R; Miyatake, H; Nicola, A; Pedersen, EM; Pereira, MES; Prat, J; Sánchez, J ...
Published in: Monthly Notices of the Royal Astronomical Society
April 1, 2023

Cosmological parameter constraints from recent galaxy imaging surveys are reaching percent-level accuracy on the effective amplitude of the lensing signal, S8. The upcoming Legacy Survey of Space and Time (LSST) of the Vera C. Rubin Observatory will produce subpercent level measurements of cosmological parameters, providing a milestone test of the CDM model. To supply guidance to the upcoming LSST analysis, it is important to understand thoroughly the results from different recent galaxy imaging surveys and assess their consistencies. In this work, we perform a unified catalogue-level reanalysis of three cosmic shear data sets: the first year data from the Dark Energy Survey (DES-Y1), the 1000 deg2 data set from the Kilo-Degree Survey (KiDS-1000), and the first year data from the Hyper Suprime-Cam Subaru Strategic Program (HSC-Y1). We utilize a pipeline developed and rigorously tested by the LSST Dark Energy Science Collaboration to perform the reanalysis and assess the robustness of the results to analysis choices. We find the S8 constraint to be robust to two different small-scale modelling approaches, and varying choices of cosmological priors. Our unified analysis allows the consistency of the surveys to be rigorously tested, and we find the three surveys to be statistically consistent. Due to the partially overlapping footprint, we model the cross-covariance between KiDS-1000 and HSC-Y1 approximately when combining all three data sets, resulting in a 1.6–1.9 per cent constraint on S8 given different assumptions on the cross-covariance.

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Published In

Monthly Notices of the Royal Astronomical Society

DOI

EISSN

1365-2966

ISSN

0035-8711

Publication Date

April 1, 2023

Volume

520

Issue

4

Start / End Page

5016 / 5041

Related Subject Headings

  • Astronomy & Astrophysics
  • 5109 Space sciences
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 0201 Astronomical and Space Sciences
 

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Longley, E. P., Chang, C., Walter, C. W., Zuntz, J., Ishak, M., Mandelbaum, R., … Wright, A. H. (2023). A unified catalogue-level reanalysis of stage-III cosmic shear surveys. Monthly Notices of the Royal Astronomical Society, 520(4), 5016–5041. https://doi.org/10.1093/mnras/stad246
Longley, E. P., C. Chang, C. W. Walter, J. Zuntz, M. Ishak, R. Mandelbaum, H. Miyatake, et al. “A unified catalogue-level reanalysis of stage-III cosmic shear surveys.” Monthly Notices of the Royal Astronomical Society 520, no. 4 (April 1, 2023): 5016–41. https://doi.org/10.1093/mnras/stad246.
Longley EP, Chang C, Walter CW, Zuntz J, Ishak M, Mandelbaum R, et al. A unified catalogue-level reanalysis of stage-III cosmic shear surveys. Monthly Notices of the Royal Astronomical Society. 2023 Apr 1;520(4):5016–41.
Longley, E. P., et al. “A unified catalogue-level reanalysis of stage-III cosmic shear surveys.” Monthly Notices of the Royal Astronomical Society, vol. 520, no. 4, Apr. 2023, pp. 5016–41. Scopus, doi:10.1093/mnras/stad246.
Longley EP, Chang C, Walter CW, Zuntz J, Ishak M, Mandelbaum R, Miyatake H, Nicola A, Pedersen EM, Pereira MES, Prat J, Sánchez J, Secco LF, Tröster T, Troxel M, Wright AH. A unified catalogue-level reanalysis of stage-III cosmic shear surveys. Monthly Notices of the Royal Astronomical Society. 2023 Apr 1;520(4):5016–5041.
Journal cover image

Published In

Monthly Notices of the Royal Astronomical Society

DOI

EISSN

1365-2966

ISSN

0035-8711

Publication Date

April 1, 2023

Volume

520

Issue

4

Start / End Page

5016 / 5041

Related Subject Headings

  • Astronomy & Astrophysics
  • 5109 Space sciences
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 0201 Astronomical and Space Sciences