Abstract
We consider the conclusive evidence of magnetically triggered jets. Astrophysical jets have strong morphological similarities in spite of their variety of physical scales. We consider the YSO jet as the typical case of astrophysical jet systems. In particular, the base region of the YSO jets is focused because our main interest is in the jet launching mechanism. We numerically examined the Zeeman spectrum when the model structure of magnetically triggered jets was assumed. The Zeeman spectrum represents the combination effects of the flow velocity and structure of magnetic fields. We found that the physical evidence of the helical field structure of jets is imprinted in the Stokes V spectrum as an “M”-shaped line profile. The detection of this characteristic feature of the Zeeman spectrum will constrain the MHD models of jets in the near future.
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