The Galactic synchrotron emission is expected to be the most relevant source of astrophysical contamination in cosmic microwave background polarization measurements, at least at frequencies ν < ∼ 100 GHz and at angular scales θ > ∼ 30′ . We present a multifrequency analysis of the Leiden surveys, linear polarization surveys covering essentially the Northern Celestial Hemisphere at five frequenc...

Context. Galactic foreground emission fluctuations are a limiting factor for precise cosmic microwave background (CMB) anisotropy measurements. Aims. We intend to improve current estimates of the influence of Galactic synchrotron emission on the analysis of CMB anisotropies. Methods. We perform an angular power spectrum analysis (APS) of all-sky total intensity maps at 408 MHz and 1420 MHz, whi...

To identify physical and sensory responses to acupuncture point stimulation (APS), nonacupuncture point stimulation (NAPS) and no stimulation (NS), changes in the high-frequency power spectrum before and after stimulation were evaluated with electroencephalography (EEG). A total of 37 healthy subjects received APS at the LI4 point, NAPS, or NS with their eyes closed. Background brain waves were...

Distances in cosmology are usually inferred from observed redshifts—an estimate that is dependent on the local peculiar motion—giving a distorted view of the three-dimensional structure and affecting basic observables such as the correlation function and power spectrum. We calculate the full nonlinear redshiftspace power spectrum for Gaussian fields, giving results for both the standard flat-sk...

We determine the angular power spectrum Cl of the Edinburgh/Durham Southern Galaxy Catalog (EDSGC) and use this statistic to constrain cosmological parameters. Our methods for determining Cl and the parameters that affect it are based on those developed for the analysis of cosmic microwave backgroundmaps. We expect them to be useful for future surveys. Assuming flat cold dark matter models with...

If the principle of statistical isotropy is valid, then angular power spectrum (APS) cosmic microwave background (CMB) radiation uncorrelated between different multipoles. We propose a novel technique to analyse any possible correlations foreground-cleaned CMB temperature APS measures ( $$C_{\ell }$$ and $${\mathcal {D}}_\ell =({\ell (\ell +1)})/({2\pi })C_\ell $$ ). This motivated by behaviour...

Precise measurements of the Planck cosmic microwave background (CMB) angular power spectrum (APS) at small angles have stimulated accurate statistical analyses lensing amplitude parameter $A_{L}$. To confirm if it satisfies value expected by flat-$\Lambda$CDM concordance model, i.e. $A_{L} = 1$, we investigate difference obtained as: measured CMB APS and best-fit $\Lambda$CDM model. know this r...