Estimating the bispectrum of the Very Small Array data

Details Estimating the bispectrum of the Very Small Array data Estimating the bispectrum of the Very Small Array data

2004-01-29

arxiv.org/abs/astro-ph/0401618v2

Mon.Not.Roy.Astron.Soc. 352 (2004) 887

Astronomy and Astrophysics

Astrophysics

17 pages, 16 figures, replaced with version accepted by MNRAS. Primordial bispectrum recalculated and figure 11 changed

Scientific paper

10.1111/j.1365-2966.2004.07885.x

We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in December 2002, and compare our results to those obtained from Gaussian simulations. There is a slight excess of large bispectrum values for two individual fields, but this does not appear when the fields are combined. Given our expected level of residual point sources, we do not expect these to be the source of the discrepancy. Using the compact configuration data, we put an upper limit of 5400 on the value of f_NL, the non-linear coupling parameter, at 95 per cent confidence. We test our bispectrum estimator using non-Gaussian simulations with a known bispectrum, and recover the input values.

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