A millimeter-wave view of the Last Journey simulation

Post-processing techniques emulating baryonic physics in gravity-only simulations are a cornerstone of modern cosmology. In particular, they are routinely used to generate synthetic datasets that are used to calibrate the analysis of cosmological survey data. These datasets are particularly important for the analysis of millimeter-wave sky surveys, which are very rich sources of cosmological information that require a precise disentangling of the different astrophysical sources involved to set accurate and precise constraints on cosmological parameters using, e.g., the anisotropties of the cosmic microwave background, its gravitational lensing, or galaxy clusters detected through the Sunyaev-Zeldovich effect.

In this talk, I will introduce a novel set of synthetic observations of the millimeter-wave sky generated from the Last Journey simulation, one of the largest synthetic universes ever produced. The dataset includes full-sky maps of the thermal and kinetic Sunyaev-Zeldovich effects, radio sources, dusty star forming galaxies, and lensing potential, along with source catalogs, produced on the same lightcone, enabling detailed studies of the correlations between different observables. The data products are publicly available, and have been extensively validated against hydrodynamic simulations and observations.