The Digital Press

The Atacama Cosmology Telescope Data Release 6 (ACT DR6) foreground model effectively characterizes millimeter-wavelength emissions, ensuring accurate cosmic microwave background (CMB) analysis. Tests confirm the model’s robustness across different datasets, simulations, and parameter variations.

Why it matters: Reliable foreground modeling is crucial for precise cosmological parameter estimation from small-scale CMB data.

The big picture: ACT DR6 foreground models align with earlier ACT, Planck, and South Pole Telescope observations, supporting consistent cosmological findings.

Stunning stat: Cosmological parameters shift less than 0.5σ under various foreground model extensions and assumptions.

Quick takeaway: Simulations with non-Gaussian, correlated foregrounds processed through ACT DR6 pipelines successfully recover true CMB cosmology, validating the analysis approach.