Changes between Version 21 and Version 22 of u/erica/radtimescales
- Timestamp:
- 04/04/16 12:57:12 (9 years ago)
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u/erica/radtimescales
v21 v22 159 159 [[latex($\boxed{t_{fs}=\frac{L}{c}\approx\frac{1.5e+17}{3e+10}= 57 ~days}$)]] 160 160 161 Given these timescales, the diffusion wave probably won't be strongly peaked, yet will be broad -- traveling close to the speed of light. If my 'assumptions' were correct about a pre-stellar core (their average size and mass), then given their 'average density' and the rosseland mean opacity, we see that they are in the optically thin limit for diffusion. Given cores are not optically thin, this means that either the density assumption is way off (they should be centrally concentrated), or setting the scale height = box radius is off (perhaps for an optically thick core the scale height should be greater than the core size (so that the energy is roughly constant throughout the core). 162 163 Tackling this slightly differently could be like confining the core to a smaller dimension so that we were ensuring we would be in the optically thick limit. That is, beginning by constraining [[latex($\lambda\approx 1/3$)]]. Then, we should be able to predict the timescale over which we would see a well-defined 'diffusion wave' propagate through the grid. 164 161 165 ''' Coupling time estimate ''' 162 166