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À propos de : Wavelet-based Faraday rotation measure synthesis        

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  • Wavelet-based Faraday rotation measure synthesis
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  • Abstract. The Faraday rotation measure synthesis, as a method for analysing multichannel observations of polarized radio emission to investigate galactic magnetic field structures requires the definition of complex polarized intensity in the wavelength range −∞ < λ2< ∞. The problem is that the measurements at negative λ2 are not possible. We introduce a simple method for continuation of the observed complex polarized intensity P(λ2) into the domain λ2< 0 using symmetry arguments. The method is suggested in context of magnetic field recognition in galactic discs where the magnetic field is supposed to have a maximum in the equatorial plane. The method is quite simple when applied to a single Faraday rotating structure on the line of sight. Recognition of several structures on the same line of sight requires a more sophisticated technique. We also introduce a wavelet-based algorithm which allows us to consider a set of isolated structures in the (φ, λ2) plane (where φ is the Faraday depth). The method essentially improves the possibilities for reconstruction of complicated Faraday structures using the capabilities of modern radio telescopes.
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