We analyze the BOOMERANG 2003 (B03) 145 GHz temperature map to constrain the amplitude of a non-Gaussian, primordial contribution to CMB fluctuations. We perform a pixel-space analysis restricted to a portion of the map chosen in view of high-sensitivity, very low foreground contamination and tight control of systematic effects. We set up an estimator based on the three Minkowski functionals which relies on high-quality simulated data, including non-Gaussian CMB maps. We find good agreement with the Gaussian hypothesis and derive the first limits based on BOOMERANG data for the nonlinear coupling parameter fNL as -300<fNL<650 at 68% CL and -800<fNL<1050 at 95% CL.
Titolo: | Searching for Non Gaussian Signals in the Boomerang 2003 CMB Maps | |
Autori: | ||
Data di pubblicazione: | 2007 | |
Rivista: | ||
Abstract: | We analyze the BOOMERANG 2003 (B03) 145 GHz temperature map to constrain the amplitude of a non-Gaussian, primordial contribution to CMB fluctuations. We perform a pixel-space analysis restricted to a portion of the map chosen in view of high-sensitivity, very low foreground contamination and tight control of systematic effects. We set up an estimator based on the three Minkowski functionals which relies on high-quality simulated data, including non-Gaussian CMB maps. We find good agreement with the Gaussian hypothesis and derive the first limits based on BOOMERANG data for the nonlinear coupling parameter fNL as -300<fNL<650 at 68% CL and -800<fNL<1050 at 95% CL. | |
Handle: | http://hdl.handle.net/11577/1775028 | |
Appare nelle tipologie: | 01.01 - Articolo in rivista |