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28 March 2024
 
  » arxiv » astro-ph/0405523

 Article overview


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
Affiliation1,2), Oleg V. Verkhodanov , Lung-Yih Chiang , Igor D. Novikov (1,4) ( NBI, Denmark Rostov, Russia SAO, Russia ASC, Russia
AbstractWe 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
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