Papers › Constraining Cluster Virialization Mechanism and Cosmology using Thermal-SZ-selected...
Constraining Cluster Virialization Mechanism and Cosmology using Thermal-SZ-selected clusters from Future CMB Surveys
Srinivasan Raghunathan, Nathan Whitehorn, Marcelo A. Alvarez, Han Aung, Nicholas Battaglia, Gilbert P. Holder, Daisuke Nagai, Elena Pierpaoli, Christian L. Reichardt, Joaquin D. Vieira
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We forecast the number of galaxy clusters that can be detected via the thermal Sunyaev-Zeldovich (tSZ) signals by future cosmic microwave background (CMB) experiments, primarily the wide area survey of the CMB-S4 experiment but also CMB-S4's smaller delensing survey and the proposed CMB-HD experiment. We predict that CMB-S4 will detect 75,000 clusters with its wide survey of f_(sky) = 50% and 14,000 clusters with its deep survey of f_(sky) = 3%. Of these, approximately 1350 clusters will be at z ≥2, a regime that is difficult to probe by optical or X-ray surveys. We assume CMB-HD will survey the same sky as the S4-Wide{}, and find that CMB-HD will detect ×3 more overall and an order of magnitude more z ≥2 clusters than CMB-S4. These results include galactic and extragalactic foregrounds along with atmospheric and instrumental noise. Using CMB-cluster lensing to calibrate cluster tSZ-mass scaling relation, we combine cluster counts with primary CMB to obtain cosmological constraints for a two parameter extension of the standard model (ΛCDM+∑m_ν+w₀). Besides constraining σ(w₀) to ≲1%, we find that both surveys can enable a ∼2.5-4.5σ detection of ∑m_ν, substantially strengthening CMB-only constraints. We also study the evolution of intracluster medium by modelling the cluster virialization v(z) and find tight constraints from CMB-S4, with further factors of 3-4 improvement for CMB-HD. The binned cluster counts, Fisher matrices, and other associated products can be downloaded from https://github.com/sriniraghunathan/tSZ_cluster_forecasts.
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