FLAMINGO Simulations: CMB Anisotropies and Extragalactic Foregrounds

This paper presents a new set of mock Cosmic Microwave Background (CMB) maps constructed from the FLAMINGO suite of cosmological hydrodynamical simulations. These simulations provide a self-consistent model of secondary anisotropies and extragalactic foregrounds, including CMB lensing, thermal and kinetic Sunyaev-Zeldovich effects, cosmic infrared background, radio point sources, and anisotropic screening maps. The authors demonstrate that the simulations reproduce a wide range of observational constraints and perform at least as well as previous mocks based on dark matter-only simulations. The study also explores how the signals depend on cosmology and feedback modeling using the model variations in FLAMINGO. The authors predict cross-correlations between some of the signals that differ significantly from those in previous mocks. The mock CMB maps are intended to provide a valuable resource for exploring correlations between different secondary anisotropies and other large-scale structure tracers, and can be applied to forecasts for upcoming surveys. The self-consistent nature of these simulations, incorporating various physical effects, allows for more accurate predictions and a better understanding of the complex interplay between different components.

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