Optimal estimator for the amplitude of the bispectrum from IR sources
arXiv:1211.3902 · doi:10.1051/0004-6361/201220751
Abstract
We devise a fast and optimal estimator for the amplitude of the bispectrum of clustered Infrared (IR) point-sources. We show how this estimator can account for the cases of partial sky coverage and inhomogeneous noise. Expected detection significance are presented in terms of signal-to-noise, finding that the IR bispectrum will realistically be undetectable below 220 GHz with a Planck-like experiment; on the contrary detection may be achieved at, or above, 220 GHz especially if the CMB is removed. We also show how this estimator can be combined with estimators of radio and CMB non-Gaussianity to build up joint robust constraints. On the one hand, we find that, for a Planck-like experiment, CMB non-Gaussianity estimation can be decoupled from point-source contributions, unless few sources are masked. On the other hand, we find that the estimation of radio and IR non-Gaussianity are strongly coupled, which diminishes their separate detection significance.
6 pages, 2 figures, 2 tables
References in corpus (11)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Planck 2013 results. I. Overview of products and scientific results
- Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity
- Planck 2013 results. XXX. Cosmic infrared background measurements and implications for star formation
- A unified empirical model for infrared galaxy counts based on observed physical evolution of distant galaxies
- A measurement of the secondary-CMB and millimeter-wave-foreground bispectrum using 800 square degrees of South Pole Telescope data
- Efficient Wiener filtering without preconditioning
- H-ATLAS: The cosmic abundance of dust from the far-infrared background power spectrum
- Point Source Contamination in CMB Non-Gaussianity Analyses
- Forecasts on the contamination induced by unresolved point sources in primordial non-Gaussianity beyond Planck
- Statistical analysis of undetected point sources in cosmic microwave background maps