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Magnetic fields are believed to have a vital role in regulating and shapingthe flow of material onto and away from protostars during their initial massaccretion phase. It is becoming increasingly accepted that bipolar outflows aregenerated and collimated as material is driven along magnetic field lines andcentrifugally accelerated off a rotating accretion disk. However, the preciserole of the magnetic field is poorly understood and evidence for its shape andstructure has not been forthcoming. Here we report imaging circular polarimetryin the near-infrared and Monte Carlo modelling showing that the magnetic fieldalong the bipolar outflow of the HH 135-136 young stellar object is helical.The field retains this shape for large distances along the outflow, so thefield structure can also provide the necessary magnetic pressure forcollimation of the outflow. This result lends further weight to the hypothesis- central to any theory of star formation - that the outflow is an importantinstrument for the removal of high-angular-momentum material from the accretiondisk, thereby allowing the central protostar to increase its mass.

Circular polarimetry reveals helical magnetic fields in the young stellar object HH 135-136