Estimating the bispectrum of the Very Small Array data
ArXiv astro-ph/0401618 (2004)
Abstract:
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.9C: a survey of radio sources at 15 GHz with the Ryle Telescope
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 342:3 (2003) 915-925
Cosmological parameter estimation and Bayesian model comparison using Very Small Array data
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 341:4 (2003) l29-l34
First results from the Very Small Array — I. Observational methods
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 341:4 (2003) 1057-1165
First results from the Very Small Array — II. Observations of the cosmic microwave background
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 341:4 (2003) 1066-1075