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Thanks to high-sensitivity, wide-band polarization observations by the Square Kilometre Array and its pathfinders such as ASKAP, the study of cosmic magnetic fields is expected to make significant progress through the use of Faraday tomography, which enables the tomographic imaging of magnetic field structure along the line of sight (LOS). The Faraday tomography provides information on parallel and perpendicular components of the magnetic field structure along the LOS, but the distance to the structures cannot be obtained in principle. On the other hand, by using star-light polarization with known distances, it is possible to obtain information about the perpendicular component of the magnetic field structure along the LOS and the distance to the structure. By combining these two data, it is expected to obtain three-dimensional information on the physical distance to and the perpendicular and parallel components of the magnetic field structures along the LOS, which could lead to a detailed understanding of the three-dimensional magnetic field structure of the Milky Way. I will overview the Faraday tomography technique and introduce the ideas and some results of this research. |
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