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2008MNRAS.389.1190B - Mon. Not. R. Astron. Soc., 389, 1190-1208 (2008/September-3)
Foreground analysis of the Wilkinson Microwave Anisotropy Probe 3-yr data with fastica.
BOTTINO M., BANDAY A.J. and MAINO D.
Abstract (from CDS):
We further apply fastica `iteratively', using data pre-cleaned using foreground templates scaled to the WMAP frequencies by coupling coefficients determined by a prior fastica analysis. This multifrequency analysis allows us to determine the presence of residual foreground emission not traced by the templates. We confirm the existence of a component spatially distributed along the Galactic plane and particularly enhanced near the centre (the `WMAP haze'). This emission is less extended when using the WMAP K-Ka data as the synchrotron template confirming that it can be considered a better template for foreground cleaning of the WMAP data. However, its use complicates the physical interpretation of the nature of the foreground emission and residuals since it contains a mixture of several, physically distinct emission mechanisms.
The good agreement between the extracted cosmic microwave background (CMB) component and previous results, as well as the low amplitude of residual foreground emission make fastica a viable tool to infer foreground emission properties, via template fitting, and the CMB amplitude.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): methods: data analysis - techniques: image processing - cosmic microwave background
Simbad objects: 6
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