A new probe of magnetic fields during high-mass star formation: Zeeman splitting of 6.7 GHz methanol masers

TL;DR

This study measures Zeeman splitting in 6.7 GHz methanol masers using the Effelsberg telescope to directly probe magnetic fields in high-mass star-forming regions, revealing their significant role in dense gas environments.

Contribution

First direct measurement of Zeeman splitting in 6.7 GHz methanol masers, providing new insights into magnetic field strengths during high-mass star formation.

Findings

Magnetic fields are dynamically important in maser regions.

Zeeman splitting detected in 17 out of 24 sources.

Estimated magnetic field strength of 23 mG in maser regions.

Abstract

Context: The role of magnetic fields during high-mass star formation is a matter of fierce debate, yet only a few direct probes of magnetic field strengths are available. Aims: The magnetic field is detected in a number of massive star-forming regions through polarization observations of 6.7 GHz methanol masers. Although these masers are the most abundant of the maser species occurring during high-mass star formation, most magnetic field measurements in the high-density gas currently come from OH and H2 O maser observations. Methods: The 100-m Effelsberg telescope was used to measure the Zeeman splitting of 6.7 GHz methanol masers for the first time. The observations were performed on a sample of 24 bright northern maser sources. Results: Significant Zeeman splitting is detected in 17 of the sources with an average magnitude of 0.56 m/s . Using the current best estimate of the 6.7 GHz methanol maser Zeeman splitting coefficient and a geometrical correction, this corresponds to an absolute magnetic field strength of 23 mG in the methanol maser region. Conclusions: The magnetic field is dynamically important in the dense maser regions. No clear relation is found with the available OH maser magnetic field measurements. The general sense of direction of the magnetic field is consistent with other Galactic magnetic field measurements, although a few of the masers display a change of direction between different maser features. Due to the abundance of methanol masers, measuring their Zeeman splitting provides the opportunity to construct a comprehensive sample of magnetic fields in high-mass star-forming regions.