Beschreibung
Galaxy clusters carry angular momentum. If the intracluster gas rotates coherently, the kinetic Sunyaev-Zeldovich (kSZ) effect imprints a dipole on the microwave sky centered on the cluster. We show that microwave maps alone can be used to reconstruct a noisy vector field tracing the projected angular momentum of the ionized gas. In this talk we introduce a simple model for coherent intracluster gas rotation. Using this model, we present an optimal multifrequency matched filter to extract the rotational kSZ signal and forecast single-cluster signal-to-noise (SNR) as a function of mass and redshift for Simons Observatory. This work provides a practical framework for CMB measurements of intracluster gas rotation, as a step towards observational study of cosmic angular momentum.