Faraday rotation measure synthesis in AIPS The new task FARS L. Kogan, F. Owen National Radio AstronomyObservatory Socorro, NM USA January 2010 ARPG

Faraday rotation measure synthesis January 2010 ARPG

Shifting along the lambda square axis January 2010 ARPG

Subtracting real and imaginary parts of the Fourier transform at the position of maximum of its amplitude January 2010 ARPG

The AIPS task FARS The task carries out: 1. Picks up the U polarization data from the first input image as real and V polarization data from the second input image, as imaginary of the complex input data 2. Fourier transform of the complex input data along the lambda square axis 3. Clean the given number of complex exponents using the pre calculated RMTF (as DB) 4. The output images (cubes) can be either the full Fourier transform for each image pixel (CLEANed or not CLEANed), or the 3 parameters of the only complex exponent. Only one output (CUBE) is used at the last case. 5. The RMTF (DB) function can be sent to the output also under control of input parameters January 2010 ARPG

The 3 parameters recorded into output image at the case of only one component. The most typical case. January 2010 ARPG

January 2010 ARPG

RMTF functions The first row: original lambda^2 (Re, Im) The second row: shifted lambda^2 (Re, Im) January 2010 ARPG