Meeting Update 0721

I have run three triggering runs with different shock velocity and realistic shock structure. The shocks below are only different in velocity. However, the density and temperature structures used here is based on the Vs = 150 km/s shock therefore they are not accurate for the other two runs.

1) Vs = 150 km/s, run to 37 kyrs (about 4.5 crushing time), no collapse. This is understandable as the shell we use has lower density and thinner than Boss'. If their shell need < 80 km/s to trigger, we may need even smaller shock speed.

http://www.pas.rochester.edu/~shuleli/realistic_shock/images/newshock1_0400.png

​movie

2) Vs = 50 km/s, run to 100 kyrs (about 4 crushing time), no collapse. This is different than Boss' < 80 km/s criterion. But again, the shock structure is wildly different.

http://www.pas.rochester.edu/~shuleli/realistic_shock/images/newshock2_0300.png

​movie

3) Vs = 10 km/s, run to just past the first crushing time, collapse triggered at the last frame. This is similar to our previous Mach 3 simulation, but with a very different shock structure.

http://www.pas.rochester.edu/~shuleli/realistic_shock/images/newshock3_0010.png

​movie

Our next step should be trying to pin down the exact threshold velocity for collapse to happen, and research on how the shock structure should change when such velocity is reached. This means triggering can only happen outside of the 1~2 pc range we have assumed before, but actually much farther from the source of the shock.

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