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Power Asymmetry in Cosmic Microwave Background Fluctuations from Full Sky to Sub-degree Scales: Is the Universe Isotropic?
F. K. Hansen, A. J. Banday, K. M. Gorski +2
We repeat and extend the analysis of Eriksen et al 2004 and Hansen et al 2004 testing the isotropy of the Cosmic Microwave Background (CMB) fluctuations. We find that the hemispher…
A model-independent test for scale-dependent non-Gaussianities in the CMB
C. Raeth, G. Morfill, G. Rossmanith +2
We present a model-independent method to test for scale-dependent non-Gaussianities in combination with scaling indices as test statistics. Therefore, surrogate data sets are gener…
Foreground analysis of the WMAP three-year data with FASTICA
M. Bottino, A. J. Banday, D. Maino
We present an analysis of the foreground emission present in the WMAP 3-year data as determined by the method of Independent Component Analysis. We derived coupling coefficients be…
The scalar perturbation spectral index n_s: WMAP sensitivity to unresolved point sources
K. M. Huffenberger, H. K. Eriksen, F. K. Hansen +2
Precision measurement of the scalar perturbation spectral index, n_s, from the Wilkinson Microwave Anisotropy Probe temperature angular power spectrum requires the subtraction of u…
The joint large-scale foreground-CMB posteriors of the 3-year WMAP data
H. K. Eriksen, C. Dickinson, J. B. Jewell +3
Using a Gibbs sampling algorithm for joint CMB estimation and component separation, we compute the large-scale CMB and foreground posteriors of the 3-yr WMAP temperature data. Our…
Joint Bayesian component separation and CMB power spectrum estimation
H. K. Eriksen, J. B. Jewell, C. Dickinson +3
We describe and implement an exact, flexible, and computationally efficient algorithm for joint component separation and CMB power spectrum estimation, building on a Gibbs sampling…
Bayesian analysis of the low-resolution polarized 3-year WMAP sky maps
H. K. Eriksen, Greg Huey, A. J. Banday +4
We apply a previously developed Gibbs sampling framework to the foreground corrected 3-yr WMAP polarization data and compute the power spectrum and residual foreground template amp…
A Scaling Index Analysis of the WMAP three year data: Signatures of non-Gaussianities and Asymmetries in the CMB
C. Raeth, P. Schuecker, A. J. Banday
Local scaling properties of the co-added foreground-cleaned three-year Wilkinson Microwave Anisotropy Probe (WMAP) data are estimated using weighted scaling indices. The scaling in…
Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
H. K. Eriksen, A. J. Banday, K. M. Gorski +2
We consider the issue of hemispherical power asymmetry in the three-year WMAP data, adopting a previously introduced modulation framework. Computing both frequentist probabilities…
CMB signal in WMAP 3yr data with FastICA
D. Maino, S. Donzelli, A. J. Banday +2
We present an application of the fast Independent Component Analysis (FastICA) to the WMAP 3yr data with the goal of extracting the CMB signal. We evaluate the confidence of our re…
Bianchi Type VII_h Models and the WMAP 3-year Data
T. R. Jaffe, A. J. Banday, H. K. Eriksen +2
Context. A specific example of Bianchi Type VIIh models, i.e. those including universal rotation (vorticity) and differential expansion (shear), has been shown in Jaffe et al. (200…
A re-analysis of the three-year WMAP temperature power spectrum and likelihood
H. K. Eriksen, Greg Huey, R. Saha +11
We analyze the three-year WMAP temperature anisotropy data seeking to confirm the power spectrum and likelihoods published by the WMAP team. We apply five independent implementatio…
Bayesian foreground analysis with CMB data
H. K. Eriksen, C. Dickinson, C. R. Lawrence +6
The quality of CMB observations has improved dramatically in the last few years, and will continue to do so in the coming decade. Over a wide range of angular scales, the uncertain…
Fast and Efficient Template Fitting of Deterministic Anisotropic Cosmological Models Applied to WMAP Data
T. R. Jaffe, A. J. Banday, H. K. Eriksen +2
We explore methods of fitting templates to cosmic microwave background (CMB) data, and in particular demonstrate the application of the total convolver algorithm as a fast method o…
Foreground Subtraction of Cosmic Microwave Background Maps using WI-FIT (Wavelet based hIgh resolution Fitting of Internal Templates)
F. K. Hansen, A. J. Banday, H. K. Eriksen +2
We present a new approach to foreground removal for Cosmic Microwave Background (CMB) maps. Rather than relying on prior knowledge about the foreground components, we first extract…
No Higher Criticism of the Bianchi Corrected WMAP Data
L. Cayon, A. J. Banday, T. Jaffe +4
Motivated by the success of the Bianchi VII_h model in addressing many of the anomalies observed in the WMAP data (Jaffe et al.), we present calculations in real and in wavelet spa…
On the Viability of Bianchi Type VIIh Models with Dark Energy
T. R. Jaffe, S. Hervik, A. J. Banday +1
We generalize the predictions for the CMB anisotropy patterns arising in Bianchi type VIIh universes to include a dark energy component. We consider these models in light of the re…
Lyman-alpha forest-CMB cross-correlation and the search for the ionized baryons at high redshift
Rupert A. C. Croft, A. J. Banday, Lars Hernquist
The intergalactic neutral hydrogen which is responsible for the Lyman alpha forest of quasar absorption is a tracer of much larger amounts of ionised hydrogen. The ionised componen…
A determination of the Spectra of Galactic components observed by WMAP
R. D. Davies, C. Dickinson, A. J. Banday +3
WMAP data when combined with ancillary data on free-free, synchrotron and dust allow an improved understanding of the spectrum of emission from each of these components. Here we ex…
Multipole vector anomalies in the first-year WMAP data: a cut-sky analysis
P. Bielewicz, H. K. Eriksen, A. J. Banday +2
We apply the recently defined multipole vector framework to the frequency-specific first-year WMAP sky maps, estimating the low-l multipole coefficients from the high-latitude sky…
CMB component separation by parameter estimation
H. K. Eriksen, C. Dickinson, C. R. Lawrence +9
We propose a solution to the CMB component separation problem based on standard parameter estimation techniques. We assume a parametric spectral model for each signal component, an…
Astro-ph communication: Simulations of the WMAP Internal Linear Combination sky map
H. K. Eriksen, A. J. Banday, K. M. Gorski +1
Following this astro-ph communication, we release a set of 10,000 WMAP ILC simulations, produced as described by Eriksen et al. (2004). We strongly encourage that an analysis of th…
Evidence of vorticity and shear at large angular scales in the WMAP data: a violation of cosmological isotropy?
T. R. Jaffe, A. J. Banday, H. K. Eriksen +2
Motivated by the large-scale asymmetry observed in the cosmic microwave background sky, we consider a specific class of anisotropic cosmological models -- Bianchi type VII_h -- and…
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…