Combining cosmic microwave background datasets with consistent foreground modelling

We present a joint cosmological analysis combining data from the satellite, the Atacama Cosmology Telescope, and the South Pole Telescope. We construct a unified likelihood that reproduces the measured temperature and polarisation power spectra by jointly modelling the cosmic microwave background (CMB) signal, Galactic and extragalactic foregrounds, and instrumental systematics across all datasets. We reduce reliance on external priors by combining datasets and improve the robustness of paramete