Faraday rotation measure synthesis in AIPS The new task FARS

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

2. Faraday rotation measure synthesis

3. Shifting along the lambda square axis

4. Subtracting real and imaginary parts of the Fourier transform at the position of maximum of its amplitude

5. 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 data2. Fourier transform of the complex input data along the lambda square axis3. 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

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

8. RMTF functionsThe first row: original lambda^2 (Re, Im)The second row: shifted lambda^2 (Re, Im)