2.原始星ジェット(<小特集>宇宙ジェットの物理)

概要

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Protostellar jets and molecular outflows are thought to play an essential role in the revolution of protostars. The jet dominates the angular momentum transport in the accretion disk while the outflow dissipates the parent cloud core which supplies material through infall onto the central protostar. Therefore, jets and outflows essentially determine the final stellar mass by controlling the infall and outflow motions. In this paper, the classification schemes and the properties of young stellar objects which drive jets and outflows are summarized with attention devoted to the youngest protostellar objects "Class 0" protostars. Subsequently we report our discovery of a newly ejected extraordinarily compact protostellar jet-a micro jet-from the Class 0 protostar S 106 FIR. This source is unique among all 40 known Class 0 sources in its lack of an extensive molecular outflow, evidenced by our sensitive multi-transition CO searches. We propose that S106 FIR is an archetype of the youngest evolutionary class, a protostar observed just after the creation of the protostellar jet.
2000-07-25