Cross-correlation between thermal Sunyaev-Zeldovich effect and the integrated Sachs-Wolfe effect

Understand

Large-angle fluctuations in the cosmic microwave background temperature induced by the integrated Sachs-Wolfe effect and Compton-y distortions from the thermal Sunyaev-Zeldovich (tSZ) effect are both due to line-of-sight density perturbations.

• Here we calculate the cross-correlation between these two signals.
• Measurement of this cross-correlation can be used to test the redshift distribution of the tSZ distortion, which has implications for the redshift at which astrophysical processes in clusters begin to operate.
• We also evaluate the detectability of a yT cross-correlation from exotic early-Universe sources in the presence of this late-time effect.