Ricean Bias Correction in Linear Polarization Observation

Details Ricean Bias Correction in Linear Polarization Observation Ricean Bias Correction in Linear Polarization Observation

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jass...28..267s&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 28, no. 4, 267-271

Astronomy and Astrophysics

Astronomy

Polarization, Data Analysis, Ricean Bias, Radio Loud Active Galactic Nuclei

Scientific paper

I developed an enhanced correction method for Ricean bias which occurs in linear polarization measurement. Two known methods for Ricean bias correction are reviewed. In low signal-to-noise area, the method based on the mode of the equation gives better representation of the fractional polarization. But a caution should be given that the accurate estimation of noise level, i.e. σ of the polarized flux, is important. The maximum likelihood method is better choice for high signal-to-noise area. I suggest a hybrid method which uses the mode of the equation at the low signal-to-noise area and takes the maximum likelihood method at the high signal-to-noise area. A modified correction coefficient for the mode solution is proposed. The impact on the depolarization measure analysis is discussed.

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