Measurement of the magnetic field direction in the NGC2024-FIR5 protostellar outflow

Details Measurement of the magnetic field direction in the NGC2024-FIR5 protostellar outflow Measurement of the magnetic field direction in the NGC2024-FIR5 protostellar outflow

2000-10-23

arxiv.org/abs/astro-ph/0010456v1

Astronomy and Astrophysics

Astrophysics

Accepted by ApJL. 10 pages, including 2 figures

Scientific paper

10.1086/318069

Molecular outflows from young protostars are widely believed to be collimated by magnetic fields, but there has been little observational evidence to support this hypothesis. Using the new technique of millimetre-wavelength spectro-polarimetry, we demonstrate the existence of a magnetic field in the NGC2024-FIR5 outflow lobe. The 1.3mm J=2-1 transition of carbon monoxide (CO) is polarized at a level of approximately 1%, in a direction within 10-15 degrees of the outflow axis. This agrees with theoretical models where the magnetic field channels the outflowing gas, and shows that the process can be effective as far as 0.1pc from the protostar.

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