Abstract
The magnetic field plays a crucial role in star formation. It is involved in rotational braking, collapse braking, outflow formation and jet collimation. Direct observations of the field are difficult. However, the field can be indirectly estimated through the field-cushioned C-shocks which produce strong infrared molecular emission lines. In particular, a high field in the outflows will generate the’ shock absorber’ signature: very broad H2 lines. Such lines are indeed observed.
Here we summarise recent progress in C-shock formation and stability. We demonstrate numerically that the Shock Absorbers are evolutionary and stable. The widths of H2 lines then limit the magnetic field strenght. A field of 6 mG is suggested for HH 212.
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Brandenburg & Zweibel, 1994, ApJ, 427, L91
Mac Low, M.-M. & Smith, M.D., 1997, ApJ, 491, 596
Smith, M.D. & Mac Low, M.-M., 1997, A&A, 326, 801
Smith, M.D., Brand, P.W.J.L., Moorhouse, A. 1991, MNRAS, 248, 730
Smith, M.D., ApJ, 406, 520
Stone, J.M., 1997, ApJ, 487, 271.
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© 1999 Springer Science+Business Media Dordrecht
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Smith, M.D., Mac Low, MM. (1999). Supersonic Ambipolar Diffusion: Estimating the Magnetic Field Strength in Protostellar Outflows. In: Lago, M.T.V.T., Blanchard, A. (eds) The Non-Sleeping Universe. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4497-1_46
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DOI: https://doi.org/10.1007/978-94-011-4497-1_46
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5923-7
Online ISBN: 978-94-011-4497-1
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