The MillenniumTNG Project: the impact of baryons and massive neutrinos on high-resolution weak gravitational lensing convergence maps

Ferlito, Fulvio; Springel, Volker; Davies, Christopher T; Hernández-Aguayo, César; Pakmor, Rüdiger; Barrera, Monica; White, Simon D M; Delgado, Ana Maria; Hadzhiyska, Boryana; Hernquist, Lars; Kannan, Rahul; Bose, Sownak; Frenk, Carlos

Abstract

We study weak gravitational lensing convergence maps produced from the MILLENNIUM TNG simulations by direct projection of the mass distribution on the past backwards lightcone of a fiducial observer. We explore the lensing maps over a large dynamic range in simulation mass and angular resolution, allowing us to establish a clear assessment of numerical convergence. By comparing full physics hydrodynamical simulations with corresponding dark-matter-only runs, we quantify the impact of baryonic physics on the most important weak lensing statistics. Likewise, we predict the impact of massive neutrinos reliably far into the non-linear regime. We also demonstrate that the ‘fixed & paired’ variance suppression technique increases the statistical robustness of the simulation predictions on large scales not only for time slices but also for continuously output lightcone data. We find that both baryonic and neutrino effects substantially impact weak lensing shear measurements, with the latter dominating over the former on large angular scales. Thus, both effects must explicitly be included to obtain sufficiently accurate predictions for stage IV lensing surveys. Reassuringly, our results agree accurately with other simulation results where available, supporting the promise of simulation modelling for precision cosmology far into the non-linear regime.

Citation

Ferlito, F., Springel, V., Davies, C. T., Hernández-Aguayo, C., Pakmor, R., Barrera, M., White, S. D. M., Delgado, A. M., Hadzhiyska, B., Hernquist, L., Kannan, R., Bose, S., & Frenk, C. (2023). The MillenniumTNG Project: the impact of baryons and massive neutrinos on high-resolution weak gravitational lensing convergence maps. Monthly Notices of the Royal Astronomical Society, 524(4), 5591-5606. https://doi.org/10.1093/mnras/stad2205

• Journal Article Type: Article
• Acceptance Date: Jul 18, 2023
• Online Publication Date: Jul 27, 2023
• Publication Date: 2023-10
• Deposit Date: Jan 25, 2024
• Publicly Available Date: Jan 25, 2024
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 524
• Issue: 4
• Pages: 5591-5606
• DOI: https://doi.org/10.1093/mnras/stad2205
• Public URL: https://durham-repository.worktribe.com/output/2164232