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HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
K. M. Gorski, E. Hivon, A. J. Banday +4
HEALPix -- the Hierarchical Equal Area iso-Latitude Pixelization -- is a versatile data structure with an associated library of computational algorithms and visualization software…
Power spectrum estimation from high-resolution maps by Gibbs sampling
H. K. Eriksen, I. J. O'Dwyer, J. B. Jewell +6
We revisit a recently introduced power spectrum estimation technique based on Gibbs sampling, with the goal of applying it to the high-resolution WMAP data. In order to facilitate…
The N-point correlation functions of the first-year Wilkinson Microwave Anisotropy Probe sky maps
H. K. Eriksen, A. J. Banday, K. M. Gorski +1
We compute the two-, three- and four-point correlation functions from the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data, and compare these to a Monte Carlo ensemble o…
Bayesian Power Spectrum Analysis of the First-Year WMAP data
I. J. O'Dwyer, H. K. Eriksen, B. D. Wandelt +6
We present the first results from a Bayesian analysis of the WMAP first year data using a Gibbs sampling technique. Using two independent, parallel supercomputer codes we analyze t…
Cosmological parameters and the WMAP data revisited
F. K. Hansen, A. Balbi, A. J. Banday +1
Several recent papers have made claims about the detection of an asymmetric distribution of large scale power in the cosmic microwave background anisotropy as measured by the WMAP…
Low-order multipole maps of CMB anisotropy derived from WMAP
P. Bielewicz, K. M. Gorski, A. J. Banday
Recent analyses of the WMAP data have suggested that the low-order multipoles of the CMB anisotropy distribution show cosmologically interesting and unexpected morphologies and amp…
Testing the cosmological principle of isotropy: local power spectrum estimates of the WMAP data
F. K. Hansen, A. J. Banday, K. M. Gorski
We apply the Gabor transform methodology proposed in (Hansen et al. 2002, 2003) to the WMAP data in order to test the statistical properties of the CMB fluctuation field and specif…
On Foreground Removal from the Wilkinson Microwave Anisotropy Probe Data by an Internal Linear Combination Method: Limitations and Implications
H. K. Eriksen, A. J. Banday, K. M. Gorski +1
We study the Internal Linear Combination (ILC) method presented by the Wilkinson Microwave Anisotropy Probe (WMAP) science team, with the goal of determining whether it may be used…
Testing for Non-Gaussianity in the Wilkinson Microwave Anisotropy Probe Data: Minkowski Functionals and the Length of the Skeleton
H. K. Eriksen, D. I. Novikov, P. B. Lilje +2
The three Minkowski functionals and the recently defined length of the skeleton are estimated for the co-added first-year Wilkinson Microwave Anisotropy Probe (WMAP) data and compa…