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Foreground analysis from the 1-year Wilkinson Microwave Anisotropy Probe (WMAP) data | Pavel D. Naselsky
; Oleg V. Verkhodanov
; Lung-Yih Chiang
; Igor D. Novikov
; | Date: |
26 May 2004 | Journal: | Int.J.Mod.Phys. D14 (2005) 1273 | Subject: | astro-ph | Affiliation: | 1,2), Oleg V. Verkhodanov , Lung-Yih Chiang , Igor D. Novikov (1,4) ( NBI, Denmark Rostov, Russia SAO, Russia ASC, Russia | Abstract: | 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. | Source: | arXiv, astro-ph/0405523 | Services: | Forum | Review | PDF | Favorites |
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