The Atacama Cosmology Telescope: A Measurement of the Thermal Sunyaev-Zel’dovich Effect Using the Skewness of the CMB Temperature Distribution

Дата и время публикации : 2012-03-29T19:14:26Z

Авторы публикации и институты :
Michael J. Wilson
Blake D. Sherwin
J. Colin Hill
Graeme Addison
Nick Battaglia
J. Richard Bond
Sudeep Das
Mark J. Devlin
Joanna Dunkley
Rolando Dunner
Joseph W. Fowler
Megan B. Gralla
Amir Hajian
Mark Halpern
Matt Hilton
Adam D. Hincks
Renee Hlozek
Kevin Huffenberger
John P. Hughes
Arthur Kosowsky
Thibaut Louis
Tobias A. Marriage
Danica Marsden
Felipe Menanteau
Kavilan Moodley
Michael D. Niemack
Michael R. Nolta
Lyman A. Page
Bruce Partridge
Erik D. Reese
Neelima Sehgal
Jon Sievers
David N. Spergel
Suzanne T. Staggs
Daniel S. Swetz
Eric R. Switzer
Hy Trac
Ed Wollack

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 9 pages, 5 figures. Replaced with version accepted by Phys. Rev. D, with improvements to the likelihood function and the IR source treatment; only minor changes in the results
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: 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.

Category: Physics