Science, Space and Technology News 2024
Magnetic fields in the halo of the Milky Way have a toroidal structure, extending in the radius range of 6000 light-years to 50,000 light-years from the Galaxy center. The Sun is at about 30,000 light-years. Credit: NAOC’s halo, which impact cosmic ray propagation and the physics of interstellar space. Their research, based on extensive Faraday rotation data, reveals that these toroids extend across the galaxy, confirming the presence of significant toroidal magnetic fields.
The origin and evolution of cosmic magnetic fields is a long-standing unsolved question at the frontier of astronomy and astrophysics research and has been selected as one of the key areas of investigation for many major world-class radio telescopes, including the Square Kilometer Array under construction. Determining the large-scale magnetic field structures in the Milky Way has been a major challenge for many astronomers in the world for decades.on May 10, Dr. Jun Xu and Prof.
Prof. Han, a leading scientist in this research field, has determined the magnetic field structures along the spiral arms of the Galactic disk through a long-term project of measuring the polarization of pulsars and their Faraday effects.
Through data analysis, scientists found that the anti-symmetry of the Faraday rotation measurements caused by the medium in the Galactic halo exists in all the sky, from the center to the anti-center of our Milky Way, which implies that the toroidal magnetic fields of such a odd symmetry have a huge size, existing in a radius range from 6000 light-years to 50,000 light-years from the center of the Milky Way.
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