A measurement of the mean central optical depth of galaxy clusters via the pairwise kinematic Sunyaev-Zel'dovich effect with SPT-3G and DES
We infer the mean optical depth of a sample of optically-selected galaxy clusters from the Dark Energy Survey (DES) via the pairwise kinematic Sunyaev-Zel'dovich (kSZ) effect. The pairwise kSZ signal between pairs of clusters drawn from the DES Year-3 cluster catalog is detected at $$4.1 \sigma$$ in cosmic microwave background (CMB) temperature maps from two years of observations with the SPT-3G camera on the South Pole Telescope. After cuts, there are 24,580 clusters in the $$\sim 1,400$$ deg$^2$ of the southern sky observed by both experiments. We infer the mean optical depth of the cluster sample with two techniques. The optical depth inferred from the pairwise kSZ signal is $$\bar{\tau}_e = (2.97 \pm 0.73) \times 10^{-3}$$, while that inferred from the thermal SZ signal is $$\bar{\tau}_e = (2.51 \pm 0.55) \times 10^{-3}$$. The two measures agree at $$0.6 \sigma$$. We perform a suite of systematic checks to test the robustness of the analysis.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- SPT-3G; DES
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1883588
- Report Number(s):
- FERMILAB-PUB-22-520-PPD; DES-2021-0649; arXiv:2207.11937; oai:inspirehep.net:2122660
- Journal Information:
- TBD, Journal Name: TBD
- Country of Publication:
- United States
- Language:
- English
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