A measurement of cluster masses using Planck and SPT-SZ CMB lensing

Abstract

We used an unbiased CMB lensing mass estimator on 468 SPT-SZ clusters from the SPT-SZ and the Planck public data, the first such estimation using combined ground- and space-based data. We measured the average ratio between CMB lensing and SZ mass to be $M_{\mathrm{CMBlens}}/M_{\mathrm{SZ}}=0.98\pm 0.19$ (stat.) $\pm 0.03$ (syst.). The average CMB lensing mass from the combination of the two data sets is measured at 4.8$\sigma$, which is a significant gain with respect to the measurement performed on the SPT-SZ only (3.9$\sigma$) or the Planck only (3.7$\sigma$) data set. We showed that the combination not only takes advantage of the two different ranges of spatial scales (i.e. Fourier modes) observed but also exploits the lensing induced correlation between scales observed by one experiment and the other. This result demonstrates the importance of measuring a large range of spatial scales for CMB lensing mass estimation, from arcmin to degrees. This large range of scales will most probably be provided by the combination of various data sets, such as from the large and small aperture telescopes of the upcoming Simons Observatory and future CMB-S4 experiment, and Planck. In this context, the Planck data will remain a key element for CMB lensing cluster studies in the years to come.

arXiv comment13 pages, 10 figures, submitted to A&A

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