2004/05/31 by Pavel D. Naselsky, L.-Y Chiang, Oleg V. Verkhodanov +4
Physics and Astronomy · #Anisotropy #Astronomy #Astrophysics #CMB cold spot #Computational physics #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Invariant (physics) #Microwave #Neutrino Physics Research #Optics #Physics #Radio Astronomy Observations and Technology #Spectral index #Spectral line #astro-ph
paper · pdf · doi:10.1142/s0218271805007280
published as Int.J.Mod.Phys. D14 (2005) 1273 · For high-resolution paper see http://www.nbi.dk/~chiang/wmap.html In the revised version we add a new section for cross correlation of phases between the derived CMB and the spectral index varying signal
arxiv created 2004/07/19 · openalex publication_date 2005/07/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a detailed analysis on the phases of the WMAP foregrounds (synchrotron, free–free and dust emission) of the WMAP K–W bands in order to estimate the significance of the variation of the spectral indices at different components. We first extract the spectral-index varying signals by assuming that the invariant part among different frequency bands have 100% cross-correlation of phases. We then use the minimization of variance, which is normally used for extracting the CMB signals, to extract the frequency independent signals. Such a common signal in each foreground component could play a significant role for any kind of component separation methods, because the methods cannot discriminate frequency independent foregrounds and CMB.