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UC Berkeley
GBT Measurements of the Zeeman Effect in the Eridanus/Orion Region
Tim Robishaw
Carl Heiles
The Orion Molecular Cloud Complex
Heiles 1997
Hat Creek 85 ft
9 years of Zeeman data
Distance ~535 pcBower, Sandstrom, Goldston
in prep.
Summary• The GBT can be used as a Zeeman detector• Apparent HI self-absorption samples the
molecular component of the filament• LOS B field measured in emission changes sign
across axis of filament– Detections consistent with previous HI emission
measurements: they were reliable!
• Field reverses within central half-degree of filament (~ 4.5 pc)
• Highest resolution data for modeling of helical magnetic field structure