Signatures of magnetic fields in massive star forming regions detected by a radio telescope in Hitachi

A research group including Tomoya Hirota, associate professor of Mizusawa VLBI Observatory (NAOJ, Ibaraki University, and NARIT), successfully detected Zeeman splitting in 6.7 GHz class II methanol masers using the Hitachi 32-m radio telescope in the Ibaraki station of NAOJ operated by Ibaraki University. Among the 103 sources with sufficiently bright maser emissions, the team detected Zeeman splitting in 62 sources, including 38 new detections.

(Figure) Analysis results for the massive protostar G06.795−0.25. (Bottom left) A spectrum obtained by averaging observational data collected over five years. The red and blue boxes correspond to the regions indicated by the red and blue arrows, respectively, in the figure on the right. (Top left) The magnitude of the detected Zeeman splitting, and the magnetic field strength—calculated using the Zeeman splitting coefficients obtained from laboratory spectroscopy (Takagi et al. 2022). (Right) Spatial distribution of the emission regions of methanol masers (Sugiyama et al. 2016; research conducted while the author was a researcher at Ibaraki University). It has been revealed that these emissions originate from a disk wind blowing off a rotating disk surrounding a massive protostar. — © 2026- Moriizumi et al.

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Center for Astronomy, Ibaraki University
Signatures of magnetic fields in massive star forming regions detected by a radio telescope in Hitachi

Ibaraki University (Automatic translation)
Signatures of magnetic fields in massive star forming regions detected by a radio telescope in Hitachi

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Signatures of magnetic fields in massive star forming regions detected by a radio telescope in Hitachi

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