Groundbreaking Magnetic Field Discovery Near Massive Protostar

The U.S. National Science Foundation National Radio Astronomy Observatory (NSF NRAO) proudly announces a major breakthrough in our understanding of star formation, thanks to the unparalleled capabilities of the U.S. National Science Foundation Karl G. Jansky Very Large Array (NSF VLA). An international team, led by astronomers from the Indian Institute of Space Science and Technology (IIST) and the Indian Institute of Science (IISc), has for the first time detected circular polarization in radio emission originating from a massive protostar, IRAS 18162-2048-unveiling fresh clues about the cosmic forces shaping our universe.

Circularly polarized radio waves have been directly observed from a young, massive protostar, a phenomenon previously recorded only near black holes and low-mass protostars, demonstrating a new link between diverse cosmic environments. This rare signal, detected using the NSF VLA, has enabled astronomers to infer magnetic field strengths of about 20-35 Gauss close to the forming star. These values are roughly 100 times stronger than Earth's magnetic field-providing the first direct clues to magnetic field strengths in such extreme environments. The findings reinforce a long-standing theory that the mechanisms launching powerful astrophysical jets are fundamentally similar, from low-mass stars through to supermassive black holes.

NSF NRAO is honored to contribute this critical technology and support to discoveries that deepen humanity's knowledge of the cosmos. Read the full releases from IIST and IISc.

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This news article was originally published on the NRAO website on July 18, 2025.