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Ambipolar Diffusion and Free-Fall Time Scales
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tff
|
~
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[ Gr ]-1/2
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~
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106 yr
[ nH2 / ( 4.5 x 103 cm-3 )
]-1/2
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tAD
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~
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8 x 106 yr ( x / 1.5 x 10-7 )
|
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xCR
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~
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1.5 x 10-7
[ zCR / ( 10-17 s-1 )
]1/2
[ nH2 / ( 4.5 x 103 cm-3 )
]-1/2
|
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tAD / tff
|
~
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8
[ zCR / ( 10-17 s-1 )
]1/2
|
References:
- Dalgarno & Oppenheimer (1973)
- Spitzer (1978)
- Elmegreen (1979)
- Shu (1983)
- Mouschovias (1987)
- Shu, Adams, & Lizano (1987)
- McKee, Zweibel, Goodman, & Heiles (1993)
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