The MillenniumTNG Project: The impact of baryons and massive neutrinos on high-resolution weak gravitational lensing convergence maps
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arXiv
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2023
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| author | 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 |
| author_facet | 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 |
| contents | We study weak gravitational lensing convergence maps produced from the MillenniumTNG (MTNG) 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_12338 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | 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 Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies We study weak gravitational lensing convergence maps produced from the MillenniumTNG (MTNG) 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. |
| title | The MillenniumTNG Project: The impact of baryons and massive neutrinos on high-resolution weak gravitational lensing convergence maps |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2304.12338 |