UC Berkeley GBT Measurements of the Zeeman Effect in the Eridanus/Orion Region Tim Robishaw Carl Heiles.

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Presentation transcript:

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 pc Bower, Sandstrom, Goldston in prep.

Starlight Polarization Orientations Breger 1976, Vrba et al. 1988

Starlight Polarization Orientations Breger 1976, Vrba et al. 1988

The GBT Is a Zeeman Machine! Off-Axis Design Minimizes Blockage Minimizes Sidelobes!!

The GBT Is a Zeeman Machine!

Verschuur’s Indictment 1993 BAAS BAAS ApJ 451: ApJ 451: 645

Verschuur’s Indictment

3 hours

The GBT Hat Creek 85 foot 3 hours

OH

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