協辦單位
NMNS
協辦單位
ASIAA
贊助單位
MOST
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名稱Title
2019天文年會
國立自然科學博物館
5月17日至19日

論文摘要

Discovery of a Compact Jet in NGC 2023 MM1

[ Oral ]

Li-Wen Liao (NTHU); Huei-Ru Vivien Chen (NTHU); F. A. Olguin (NTHU); Chin-Fei Lee (ASIAA)

Bipolar outflows play an important role in removing excessive angular momentum in the accretion flow and help the material to accrete onto the central protostars. We resolve the bipolar outflow associated with the nearby Class 0 protostar, NGC 2023 MM1, with the Sub-Millimeter Array (SMA). With an angular resolution of 3.5", we discover, for the first time, a compact bipolar jet in the CO (2-1) and SiO (5-4) emissions. The bipolar jet shows velocity offsets up to 80 km/s with a spatial extent of ~12000 au. The physical properties of the jets, such as the outflow mass and the mass-loss rate, are comparable to jets driven by Class~0 protostars. The kinematics perpendicular to the jet axis is inspected. We speculate a plausible jet rotation based on small velocity gradients across the jet axis with consistent rotation direction. Meanwhile, the possible bipolar outflow associated with the nearby continuum source, MM2, is found in the low-velocity CO (2-1) gas. The outflow activities imply MM2 to be a protostar.