Notes from the ISM-PP conference: Day 5

Linda Tacconi

High-redshift
  • Outflows with mass-loading parameters 1-10
  • velocity dispersions 25-80 km/s + seen in both CO and H-alpha

Avishai Dekel: Violent Disk Instability

Galaxies form at nodes in web at high z
  • disk surrounded by messy "interaction region"
  • disk outflows observed
  • Toomre unstable clumps ~10^9 msun + dynamically dominant (unlike MW clumps) + violent instability, not secular
  • long time spent in disks
  • Stellar-dominated galaxies at z~1 stop "VDI" + bulge stabilizes inner part of galaxy
  • "clumps" are rapidly spinnign
  • both VDI and "ex-situ" dark matter clumps
  • universal SF law: divide by t_ff + t_ff is either Toomre tff or gmc tff
  • "redshift 2 is the only important phase, forget about z=0"
  • Steve: How does "universal law" fit with Galactic CMZ? + Ignorance. Ask Mark.
  • Rahul: Toomre Q threshold only works for infinitely thin disk. Shouldn't threshold be lower because of thick disk?
  • Goldreich & Linden-Bell: 30% effect. Elmegreen addresses this.

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