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Atacama Cosmology Telescope: A measurement of the thermal Sunyaev-Zel’dovich effect using the skewness of the CMB temperature distribution

Author(s): Wilson, Michael J; Sherwin, Blake D; Hill, J Colin; Addison, Graeme E.; Battaglia, Nick; et al

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Abstract: We present a detection of the unnormalized skewness <(T) over tilde (3)((n) over cap)> 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) over tilde (3)((n) over cap)> = -31 +/- 6 mu K-3 (Gaussian statistics assumed) or +/- 14 mu K-3 ( including non- Gaussian corrections) 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. DOI: 10.1103/PhysRevD.86.122005
Publication Date: 15-Dec-2012
Electronic Publication Date: 20-Dec-2012
Citation: Wilson, Michael J, Sherwin, Blake D, Hill, J Colin, Addison, Graeme, Battaglia, Nick, Bond, J Richard, Das, Sudeep, Devlin, Mark J, Dunkley, Joanna, Duenner, Rolando, Fowler, Joseph W, Gralla, Megan B, Hajian, Amir, Halpern, Mark, Hilton, Matt, Hincks, Adam D, Hlozek, Renee, Huffenberger, Kevin, Hughes, John P, Kosowsky, Arthur, Louis, Thibaut, Marriage, Tobias A, Marsden, Danica, Menanteau, Felipe, Moodley, Kavilan, Niemack, Michael D, Nolta, Michael R, Page, Lyman A, Partridge, Bruce, Reese, Erik D, Sehgal, Neelima, Sievers, Jon, Spergel, David N, Staggs, Suzanne T, Swetz, Daniel S, Switzer, Eric R, Trac, Hy, Wollack, Ed. (2012). Atacama Cosmology Telescope: A measurement of the thermal Sunyaev-Zel’dovich effect using the skewness of the CMB temperature distribution. PHYSICAL REVIEW D, 86 (10.1103/PhysRevD.86.122005
DOI: doi:10.1103/PhysRevD.86.122005
ISSN: 1550-7998
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW D
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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