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- W2055130152 abstract "We present a detection of the unnormalized skewness <T^3> induced by the thermal Sunyaev-Zel'dovich (tSZ) effect in filtered Atacama Cosmology Telescope (ACT) 148 GHz cosmic microwave background temperature maps. Contamination due to infrared and radio sources is minimized by template subtraction of resolved sources and by constructing a mask using outlying values in the 218 GHz (tSZ-null) ACT maps. We measure <T^3>= -31 +- 6 mu K^3 (measurement error only) or +- 14 mu K^3 (including cosmic variance error) in the filtered ACT data, a 5-sigma detection. We show that the skewness is a sensitive probe of sigma_8, and use analytic calculations and tSZ simulations to obtain cosmological constraints from this measurement. From this signal alone we infer a value of sigma_8= 0.79 +0.03 -0.03 (68 % C.L.) +0.06 -0.06 (95 % C.L.). Our results demonstrate that measurements of non-Gaussianity can be a useful method for characterizing the tSZ effect and extracting the underlying cosmological information." @default.
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- W2055130152 date "2012-12-20" @default.
- W2055130152 modified "2023-09-25" @default.
- W2055130152 title "Atacama Cosmology Telescope: A measurement of the thermal Sunyaev-Zel’dovich effect using the skewness of the CMB temperature distribution" @default.
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- W2055130152 doi "https://doi.org/10.1103/physrevd.86.122005" @default.
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