English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We employ the one-dimensional Fourier representation (1DFR) to analyze the3-year WMAP de-biased internal linear combination (DILC) map and its possiblecontamination by galactic foregrounds. The 1DFR is a representation of thespherical harmonic coefficients for each l mode using an inverse Fouriertransform into one-dimensional curves. Based on the a priori assumption thatthe CMB signal should be statistically independent of, and consequently have nosignificant correlation with, any foregrounds, we cross-correlate the 1DFRcurves of 2 <= l <= 10 modes, which are claimed by the WMAP team to be free ofcontamination and suitable for whole sky analysis. We find that 8 out of the 9modes are negatively cross correlated with the foreground maps, an event whichhas a probability of only 9/512 ~ 0.0176 for uncorrelated signals. Furthermore,the local extrema of the 1DFR curves between the DILC and those of theforegrounds for l=2 and 6 are correlated with significance level below 0.04. Wealso discuss the minimum variance optimization method and use the properties ofthe measured cross-correlation to estimate the possible level of contaminationpresent in the DILC map.Comment: Accepted for publication to JCAP after adding a further correlation  test with the foreground templates that are independent from WMAP data : 408  MHz radio continuum map, H-alpha map and the dust map extrapolated from  COBE/DIRBE data, which show significant correlation with the DILC ma

journal of cosmology and astroparticle physics

The one-dimensional Fourier representation and large angular scale foreground contamination in the three-year Wilkinson Microwave Anisotropy Probe data