Supersonic Ambipolar Diffusion: Estimating the Magnetic Field Strength in Protostellar Outflows |
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Authors: | Michael D Smith Mordecai-Mark Mac Low |
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Institution: | 1. Astronomisches Institut der, Universit?t Würzburg, Am Hubland, 97074, Würzburg, Germany 2. Max-Planck-Institut für Astronomie, K?nigstuhl 17, D-69117, Heidelberg, Germany
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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 H2lines. 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 H2lines then limit the magnetic field strength. A field of 6 mG is suggested for HH 212.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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