SIMBAD references

Faraday tomography is a novel method to probe the three-dimensional structure of magnetic fields of polarized radio sources. In this paper, we investigate the intrinsic Faraday dispersion function (FDF) of disk galaxies extending a simple analytic model of galactic magnetic fields developed in Ideguchi et al. The model consists of axisymmetric coherent fields and turbulent fields, and we consider the effects of inclination, the relative amplitude of coherent and turbulent magnetic fields, and the pitch angle of coherent fields. Our simple model makes it easy to obtain a physical interpretation of FDFs and helps us understand observational results. We find that FDFs generally have two peaks when galaxies are observed with nonzero inclination and the gap between the two peaks, their relative heights, and their widths are dependent on the model parameters. In particular, the gap is strongly dependent on the inclination angle and typically varies by a factor of two when we consider the inclination of 10°-60°, while the relative height varies by less than 20%. These findings provide us with the important lesson that the presence of two peaks in intrinsic FDFs does not necessarily imply the presence of two separate radio sources within a beam and they allow us to estimate the galactic parameters.