Some filament/magnetic field observations

The integral-shaped cloud, and field

The following images depict the integral-shaped filament in Orion-A, and some have corresponding magnetic field vectors overlaid. One hypothesis is that this filament is wrapped by a helical magnetic field.

This filament/field morphology also bears striking resemblance to an oblique, reoriented colliding flow (60-degrees):

Herschel view of Taurus

Here is another example of a well-studied filament and corresponding field topology. I am pretty sure I've read that the uncertainty on the field vectors increases in the densest regions of the gas.

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