DOE OSTI · 1871050
Improving Cosmological Constraints from Galaxy Cluster Number Counts with CMB-cluster-lensing Data: Results from the SPT-SZ Survey and Forecasts for the Future
Abstract
Abstract We show the improvement to cosmological constraints from galaxy cluster surveys with the addition of cosmic microwave background (CMB)-cluster lensing data. We explore the cosmological implications of adding mass information from the 3.1 σ detection of gravitational lensing of the CMB by galaxy clusters to the Sunyaev–Zel’dovich (SZ) selected galaxy cluster sample from the 2500 deg 2 SPT-SZ survey and targeted optical and X-ray follow-up data. In the ΛCDM model, the combination of the cluster sample with the Planck power spectrum measurements prefers σ 8 Ω m / 0.3 0.5 = 0.831 ± 0.020 . Adding the cluster data reduces the uncertainty on this quantity by a factor of 1.4, which is unchanged whether the 3.1 σ CMB-cluster lensing measurement is included or not. We then forecast the impact of CMB-cluster lensing measurements with future cluster catalogs. Adding CMB-cluster lensing measurements to the SZ cluster catalog of the ongoing SPT-3G survey is expected to improve the expected constraint on the dark energy equation of state w by a factor of 1.3 to σ ( w ) = 0.19. We find the largest improvements from CMB-cluster lensing measurements to be for σ 8 , where adding CMB-cluster lensing data to the cluster number counts reduces the expected uncertainty on σ 8 by respective factors of 2.4 and 3.6 for SPT-3G and CMB-S4.
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Chaubal, P. S., Reichardt, C. L. (ORCID:0000000322269169), Gupta, N. (ORCID:0000000176529451), Ansarinejad, B., Aylor, K., Balkenhol, L., Baxter, E. J. (ORCID:0000000268363196), Bianchini, F., Benson, B. A., Bleem, L. E., Bocquet, S. (ORCID:000000024900805X), Carlstrom, J. E., Chang, C. L., Crawford, T. M. (ORCID:0000000190005013), Crites, A. T., de Haan, T., Dobbs, M. A. (ORCID:0000000171666422), Everett, W. B. (ORCID:0000000253706651), Floyd, B. (ORCID:000000034175571X), George, E. M. (ORCID:0000000178740445), Halverson, N. W., Holzapfel, W. L., Hrubes, J. D., Knox, L., Lee, A. T., Luong-Van, D., McMahon, J. J., Meyer, S. S. (ORCID:0000000333154332), Mocanu, L. M. (ORCID:0000000224162552), Mohr, J. J., Natoli, T., Padin, S., Pryke, C., Ruhl, J. E., Ruppin, F. (ORCID:0000000209558954), Salvati, L., Saro, A., Schaffer, K. K., Shirokoff, E., Staniszewski, Z., Stark, A. A. (ORCID:0000000227189996), Vieira, J. D. (ORCID:0000000171923871), Williamson, R.. 2022-06-03. Improving Cosmological Constraints from Galaxy Cluster Number Counts with CMB-cluster-lensing Data: Results from the SPT-SZ Survey and Forecasts for the Future. https://doi.org/10.3847/1538-4357%2Fac6a55
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