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arXiv · 1712.02380

On the ISW-cluster cross-correlation in future surveys

Mario Ballardini·Daniela Paoletti·Fabio Finelli·Lauro Moscardini·Barbara Sartoris·Luca Valenziano
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Abstract

We investigate the cosmological information contained in the cross-correlation between the Integrated Sachs-Wolfe (ISW) of the Cosmic Microwave Background (CMB) anisotropy pattern and galaxy clusters from future wide surveys. Future surveys will provide cluster catalogues with a number of objects comparable with galaxy catalogues currently used for the detection of the ISW signal by cross-correlation with the CMB anisotropy pattern. By computing the angular power spectra of clusters and the corresponding cross-correlation with CMB, we perform a signal-to-noise ratio (SNR) analysis for the ISW detection as expected from the eROSITA and the Euclid space missions. We discuss the dependence of the SNR of the ISW-cluster cross-correlation on the specifications of the catalogues and on the reference cosmology. We forecast that the SNRs for ISW-cluster cross-correlation are alightly smaller compared to those which can be obtained from future galaxy surveys but the signal is expected to be detected at high significance, i.e. more than $> 3\,σ$. We also forecast the joint constraints on parameters of model extensions of the concordance $Λ$CDM cosmology by combining CMB and the ISW-cluster cross-correlation.

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Mario Ballardini, Daniela Paoletti, Fabio Finelli, Lauro Moscardini, Barbara Sartoris, Luca Valenziano. 2018-11-22. On the ISW-cluster cross-correlation in future surveys. https://doi.org/10.1093/mnras%2Fsty2795

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