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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2024

Impact of property covariance on cluster weak lensing scaling relations

Daisuke Nagai
Erwin T Lau
  • Fonction : Auteur
Hao-Yi Wu
Anja von der Linden
  • Fonction : Auteur
Tamas Varga
  • Fonction : Auteur
Hao-Yi Wu
  • Fonction : Auteur
Andrew Hearin
  • Fonction : Auteur
Heather Kelly
  • Fonction : Auteur
Johnny Esteves
  • Fonction : Auteur
Enia Xhakaj
  • Fonction : Auteur
Conghao Zhou
  • Fonction : Auteur

Résumé

We present an investigation into a hitherto unexplored systematic that affects the accuracy of galaxy cluster mass estimates with weak gravitational lensing. Specifically, we study the covariance between the weak lensing signal, ΔΣ, and the "true" cluster galaxy number count, Ngal, as measured within a spherical volume that is void of projection effects. By quantifying the impact of this covariance on mass calibration, this work reveals a significant source of systematic uncertainty. Using the MDPL2 simulation with galaxies traced by the SAGE semi-analytic model, we measure the intrinsic property covariance between these observables within the 3D vicinity of the cluster, spanning a range of dynamical mass and redshift values relevant for optical cluster surveys. Our results reveal a negative covariance at small radial scales (R ≲ R200c) and a null covariance at large scales (R ≳ R200c) across most mass and redshift bins. We also find that this covariance results in a 2-3 % bias in the halo mass estimates in most bins. Furthermore, by modeling Ngal and Ngal and ΔΣ as multi-(log)-linear equations of secondary halo properties, we provide a quantitative explanation for the physical origin of the negative covariance at small scales. Specifically, we demonstrate that the Ngal–ΔΣ covariance can be explained by the secondary properties of halos that probe their formation history. We attribute the difference between our results and the positive bias seen in other works with (mock)-cluster finders to projection effects. These findings highlight the importance of accounting for the covariance between observables in cluster mass estimation, which is crucial for obtaining accurate constraints on cosmological parameters.
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hal-04587419 , version 1 (24-05-2024)

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Zhuowen Zhang, Arya Farahi, Daisuke Nagai, Erwin T Lau, Joshua Frieman, et al.. Impact of property covariance on cluster weak lensing scaling relations. Monthly Notices of the Royal Astronomical Society, 2024, 530 (3), pp.3127 - 3149. ⟨10.1093/mnras/stae999⟩. ⟨hal-04587419⟩
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