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The imprint left on the cosmic microwave background (CMB) from CMB photons scattering off high-energy electrons in galaxies and clusters is known as the Sunyaev-Zel'dovich (SZ) effect and is the subject of these two papers from the Atacama Cosmology Telescope (ACT). ACT measurements combined with those of Planck and BOSS are shown to provide a rich picture of the electron gas thermodynamics of the galactic and cluster medium. This can be used to test and improve cosmological simulations relevant for upcoming experiments.
Amodeo et al. (Mon,) studied this question.
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