Thermal Sunyaev-Zeldovich effect angular distribution

Sunyaev-Zeldovich effect full bispectrum

The thermal Sunyaev-Zeldovich (tSZ) effect is mostly sourced by galaxy clusters, and as such it is a very non-Gaussian field. Thus, high order statistics carry significant information which is not contained in the power spectrum. We performed a joint Fisher analysis of the tSZ power spectrum and bispectrum to verify how much the full bispectrum can contribute to improve parameter constraints. Despite being a Fisher forecast, our analysis is quite sophisticated, as we include the complete power spectrum and bispectrum (auto- and cross-) covariance, we consider a multi-component foreground scenario and model the effects of component separation, and we consider an extended set of both cosmological and intra-cluster medium parameters. Despite these effects that we account for in the modelling, the tSZ bispectrum is very efficient at breaking parameter degeneracies, making it able to produce even stronger cosmological constraints than the tSZ power spectrum.
Reference:
AR, M. Rizzato, S. Radinović, et al., Breaking degeneracies with the Sunyaev-Zeldovich full bispectrum, JCAP 06 (2021) 026, [arXiv:2008.12947]