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 as at f(NL) as -300 < f(NL) < 650 at 68% CL and -800 < f(NL) < 1050 at 95% CL.
Searching for Non-Gaussian Signals in the BOOMERANG 2003 CMB Maps
NATOLI, Paolo;
2007
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 as at f(NL) as -300 < f(NL) < 650 at 68% CL and -800 < f(NL) < 1050 at 95% CL.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
