National Tsing Hua University Institutional Repository:A quantitative model for bipolar molecular outflows
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    National Tsing Hua University Institutional Repository > 歷任校長 > 徐遐生 (2002-2006) > 會議論文 >  A quantitative model for bipolar molecular outflows


    题名: A quantitative model for bipolar molecular outflows
    作者: Li, ZY;Shu, FH
    教師: 徐遐生
    日期: 1996
    出版者: Astronomical Society of the Pacific
    關聯: IAU Colloquium 163 on Accretion Phenomena and Related Outflows, PORT DOUGLAS, AUSTRALIA, JUL 15-19, 1996
    关键词: bipolar molecular outflows
    摘要: Since their first discovery in 1980, nearly 200 bipolar molecular outflows have now been observed. These outflows appear to be a ubiquitous phenomenon in the star formation process, although their origin remains unclear. Here, we adopt the thin-shell model of Shu, Ruden, Lada, & Lizano (1991, ApJL, 370, 31) in which bipolar molecular outflows are the swept-up ambient material by powerful winds from central young stellar objects. Besides explaining many observed features of bipolar sources, such as shape, velocity, and the typical extent, this model also naturally accounts for the so-called “Hubble law” of velocity field. However, it was criticized by Masson & Chernin (1992, ApJ, 387, L47) on the ground that much less mass is observed at the high velocity end of some bipolar outflows than expected from this thin-shell model, unless the wind and/or the ambient medium are extremely anisotropic. We show that the extreme anisotropy is in fact inevitable both in the wind and in the ambient medium, because of the presence of dynamically important magnetic fields.
    显示于类别:[ 徐遐生 (2002-2006)] 會議論文
    [物理系] 會議論文


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