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    NTHUR > Presidents > Shu, Frank Hsia-San (2002-2006 ) > SFHS Conference papers >  A quantitative model for bipolar molecular outflows

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    Title: A quantitative model for bipolar molecular outflows
    Authors: Li, ZY;Shu, FH
    Teacher: 徐遐生
    Date: 1996
    Publisher: Astronomical Society of the Pacific
    Relation: IAU Colloquium 163 on Accretion Phenomena and Related Outflows, PORT DOUGLAS, AUSTRALIA, JUL 15-19, 1996
    Keywords: bipolar molecular outflows
    Abstract: 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.
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    Appears in Collections:[Shu, Frank Hsia-San (2002-2006 )] SFHS Conference papers
    [Department of Physics] PHYS Conference Papers

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