Measurement of the galaxy-velocity power spectrum of DESI tracers with the kinematic Sunyaev–Zeldovich effect using DESI DR2 and ACT DR6

Chaussidon et al. 2020

• kinetic SZ: Doppler shift of CMB photons scattered by electrons moving with a bulk velocity relative to the CMB rest frame

• thermal SZ:  inverse Compton scattering of CMB photons by hot electrons in galaxy clusters

• Cosmic Infrared Background: thermal dust emission from unresolved star-forming galaxies throughout cosmic history

https://ned.ipac.caltech.edu/level5/Sept05/Carlstrom/Carlstrom2.html