Astronomers Map Milky Way's Magnetic Field and Discover a Directional Reversal
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Astronomers have published a new dataset and model mapping the Milky Way's invisible magnetic field, revealing a reversal in its direction within the Sagittarius Arm. The research, based on a wide-ranging radio survey, provides a three-dimensional model of this phenomenon. This work offers a new tool for understanding the forces shaping our galaxy.
Facts First
- A new dataset and model map the Milky Way's invisible magnetic field based on a wide radio-frequency survey.
- The magnetic field reverses direction in the Sagittarius Arm, moving counterclockwise compared to the galaxy's overall clockwise field.
- The research introduces a three-dimensional model for this magnetic field reversal.
- Observations were part of the Global Magneto-Ionic Medium Survey (GMIMS) using a new telescope in British Columbia.
- Data was collected by measuring Faraday rotation of radio waves traveling through magnetic fields and electrons.
What Happened
Astronomers have published two studies introducing a new dataset and model for the Milky Way's invisible magnetic field. The research, part of the Global Magneto-Ionic Medium Survey (GMIMS), used a new telescope at the Dominion Radio Astrophysical Observatory in British Columbia to survey the northern sky across a wide range of radio frequencies. By measuring Faraday rotation—an effect on radio waves traveling through areas with electrons and magnetic fields—the team traced magnetic structures. They discovered that in the Sagittarius Arm, the magnetic field appears to reverse direction, moving counterclockwise while the galaxy's overall field moves clockwise. A new three-dimensional model presents this reversal as a diagonal from Earth.
Why this Matters to You
This research may deepen our fundamental understanding of the galaxy you live in. Mapping invisible forces like magnetic fields helps explain the structure and evolution of the Milky Way, which could lead to a more complete picture of our cosmic environment. The new dataset and model provide tools for astronomers, potentially accelerating future discoveries about the universe.
What's Next
The new dataset and three-dimensional model are now available for astronomers to use in further research. Scientists may apply these tools to investigate other galactic magnetic structures or refine our understanding of the Milky Way's formation. The ongoing GMIMS international effort is likely to continue mapping the galaxy's magnetic field.