Optimal limits on f_{NL}^{local} from WMAP 5-year data

Details Optimal limits on f_{NL}^{local} from WMAP 5-year data Optimal limits on f_{NL}^{local} from WMAP 5-year data

2009-01-19

arxiv.org/abs/0901.2572v2

JCAP 0909:006,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

[v1] 21 pages, 7 figures. [v2] minor changes matching published version

Scientific paper

10.1088/1475-7516/2009/09/006

We have applied the optimal estimator for f_{NL}^{local} to the 5 year WMAP data. Marginalizing over the amplitude of foreground templates we get -4 < f_{NL}^{local} < 80 at 95% CL. Error bars of previous (sub-optimal) analyses are roughly 40% larger than these. The probability that a Gaussian simulation, analyzed using our estimator, gives a result larger in magnitude than the one we find is 7%. Our pipeline gives consistent results when applied to the three and five year WMAP data releases and agrees well with the results from our own sub-optimal pipeline. We find no evidence of any residual foreground contamination.

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