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題 名 | Resolving the Two Outflows from the Class 0 Protobinary VLA1623=分開Class 0原恆雙星VLA1623的兩道噴流 |
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作 者 | 穆美蓉; 賴詩萍; | 書刊名 | 臺北天文館學報 |
卷 期 | 8 2010.12[民99.12] |
頁 次 | 頁29-33 |
分類號 | 323.8 |
關鍵詞 | 原恆星形成; 噴流; 原恆雙星; Star formation; Outflows; Protobinary; VLA1623; |
語 文 | 英文(English) |
中文摘要 | 早期原恆星的噴流是恆星形成早期的重要機制,因為噴流可以帶走角動量,使得分子雲得以重力塌縮。我們研究位於ρ蛇夫座分子雲中的原恆星VLA1623。日前高解析度的觀測顯示,VLA1623的連續輻射顯示出兩個相距140AU的原恆星,指出VLA1623可能是一個原恆雙星系統。我們使用次毫米波陣列望遠鏡的緊密配置(compact configuration)來進行觀測。觀測數據顯示VLA1623有非常集中的12CO J(3-2)噴流,且其紅移及藍移的部分重疊,暗示噴流的可能平形於天空平面。然而,從channel map和P-V圖中顯示的噴流位置以及特性並且比較先前的研究和理論的P-V圖,我們推論VLA1623有兩道噴流,每道源自其中一個原恆星。C17O(3-2)顯示原恆星的包層有垂直於噴流的旋轉。SO(9-8)相似於噴流中央藍移的knot的速度梯度,指出可能有噴流造成的衝擊波 (shock)。 |
英文摘要 | Protostellar outflows are important in the early stage of star formation, because they can transfer the angular momentum outward allowing further gravitational collapse to proceed. We study the Class 0 source VLA1623, embedded in the ρ Ophiuchi cloud. Previous high resolution observations have shown that VLA1623's continuum emission breaks up into two almost equal point sources with a separation of ~140AU (Looney et al. 2000) strongly suggesting that VLA1623 is a protobinary system. Our new observations were done using the Submillimeter Array (SMA) in compact configuration. Our data shows that VLA1623 has strong collimated outflows in 12CO J(3-2) with overlapping redand blue-shifted morphology, which could imply that the outflow is located exactly on the plane of the sky. However, after studying the position and characteristics of the lobes from the channel map and P-V diagram, and comparing to previous studies and theoretical P-V diagrams, we conclude that VLA1623 presents two outflows, one emanating from each source. The envelope material traced in C17O (3-2) shows rotation perpendicular to the outflow axis. The material traced with SO (9-8) shows a velocity gradient similar to that of the outflows' central blue knot, suggesting a shock caused by the outflow. |
本系統中英文摘要資訊取自各篇刊載內容。