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Article Dans Une Revue Astron.Astrophys. Année : 2022

ShapePipe: a new shape measurement pipeline and weak-lensing application to UNIONS/CFIS data

Axel Guinot
  • Fonction : Auteur
Martin Kilbinger
Samuel Farrens
  • Fonction : Auteur
Austin Peel
  • Fonction : Auteur
Arnau Pujol
  • Fonction : Auteur
Morgan Schmitz
  • Fonction : Auteur
Jean-Luc Starck
  • Fonction : Auteur
Thomas Erben
  • Fonction : Auteur
Stephen Gwyn
Michael J. Hudson
  • Fonction : Auteur
Hendrik Hiledebrandt
  • Fonction : Auteur
Tobias Liaudat
Lance Miller
  • Fonction : Auteur
Isaac Spitzer
  • Fonction : Auteur
Ludovic van Waerbeke
  • Fonction : Auteur
Jean-Charles Cuillandre
  • Fonction : Auteur
Sébastien Fabbro
Alan Mcconnachie
  • Fonction : Auteur
Yannick Mellier
  • Fonction : Auteur
  • PersonId : 828449

Résumé

UNIONS is an ongoing collaboration that will provide the largest deep photometric survey of the Northern sky in four optical bands to date. As part of this collaboration, CFIS is taking $r$-band data with an average seeing of 0.65 arcsec, which is complete to magnitude 24.5 and thus ideal for weak-lensing studies. We perform the first weak-lensing analysis of CFIS $r$-band data over an area spanning 1700 deg$^2$ of the sky. We create a catalogue with measured shapes for 40 million galaxies, corresponding to an effective density of 6.8 galaxies per square arcminute, and demonstrate a low level of systematic biases. This work serves as the basis for further cosmological studies using the full UNIONS survey of 4800 deg$^2$ when completed. Here we present ShapePipe, a newly developed weak-lensing pipeline. This pipeline makes use of state-of-the-art methods such as Ngmix for accurate galaxy shape measurement. Shear calibration is performed with metacalibration. We carry out extensive validation tests on the Point Spread Function (PSF), and on the galaxy shapes. In addition, we create realistic image simulations to validate the estimated shear. We quantify the PSF model accuracy and show that the level of systematics is low as measured by the PSF residuals. Their effect on the shear two-point correlation function is sub-dominant compared to the cosmological contribution on angular scales <100 arcmin. The additive shear bias is below 5x$10^{-4}$, and the residual multiplicative shear bias is at most $10^{-3}$ as measured on image simulations. Using COSEBIs we show that there are no significant B-modes present in second-order shear statistics. We present convergence maps and see clear correlations of the E-mode with known cluster positions. We measure the stacked tangential shear profile around Planck clusters at a significance higher than $4\sigma$.
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hal-03656391 , version 1 (23-03-2023)

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Axel Guinot, Martin Kilbinger, Samuel Farrens, Austin Peel, Arnau Pujol, et al.. ShapePipe: a new shape measurement pipeline and weak-lensing application to UNIONS/CFIS data. Astron.Astrophys., 2022, 666, pp.A162. ⟨10.1051/0004-6361/202141847⟩. ⟨hal-03656391⟩
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