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- W2078600816 abstract "We present VLA observations of the Zeeman effect in 22 GHz H2O masers in several high-mass star-forming regions. These masers are believed to arise from collisional pumping in postshock environments. Therefore, the Zeeman effect data provide the most direct measurements of magnetic field strengths in high-density (n ≳ 108 cm-3) postshock gas, where the field energy determines other physical conditions. Our observations yield significant magnetic field detections in W3 IRS 5, W3(OH), W49 N, and OH 43.8-0.1. In these sources, we detect line-of-sight field strengths ranging from 13 to 49 mG. For some regions, the detected fields provide a 2-3 point sampling of the magnetic field, indicating the nature of field variations on arcsecond scales. These field strengths are consistent with a shock-driven maser model having relatively low speed (20 km s-1), C-type shocks. We examine the balance between magnetic field energy and turbulent kinetic energy in the masing regions. These energies appear close to equilibrium." @default.
- W2078600816 created "2016-06-24" @default.
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- W2078600816 date "2002-12-01" @default.
- W2078600816 modified "2023-10-16" @default.
- W2078600816 title "Magnetic Fields in Shocked Regions: Very Large Array Observations of H<sub>2</sub>O Masers" @default.
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- W2078600816 doi "https://doi.org/10.1086/343799" @default.
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