2005/03/01 by Pavel Naselsky, Pavel D. Naselsky, Naselsky, Pavel D. +3
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #Geophysics and Gravity Measurements #Radio Astronomy Observations and Technology #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0503015
4 pages, 4 figures
arxiv created 2005/03/01 · openalex publication_date 2005/03/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a specific periodicity of the Galaxy images in the multipole domain which can be used for separation of the cosmic microwave background (CMB) signal from the Galaxy and foreground component. This method takes into consideration all the coefficients of the expansion of the signal from the sky ΔT(Θ, ϕ) into spherical harmonics and dealing with combination of multipoles al,m and al+Δ,m for each multipole mode (ℓ, -ℓ ≤ m ≤ ℓ) from the whole sky without galactic cut, masks or any dissection of the whole sky into disjoint regions. For the polar coordinate system we use particular values for Δ=4n, n=1,2,... which remove all bright point-like sources localized in the Galactic plane and strong diffused component down to the CMB level. To illustrate that significant correlations of the point like sources and foregrounds al,m,al+Δ,m coefficients we apply this method to the WMAP Q,V and W bands in order to remove these marks of Galaxy from the maps. We believe that our method would be useful for separation of the CMB signal from different kind of "noises" in the maps.