I don't think the presence of dust changes the gravitational dynamics in any significant way.dougettinger wrote:I am more concerned with 2nd and 3rd generation stars where dust particles could provide a differential for the size of particle masses.
I'd use 1e9 molecules per cubic meter. That's still a hard vacuum, of course, but I think is pretty typical for the density of IMCs. The densest parts, where star formation is observed, are about a thousand times denser than the overall average (so, 1e12 molecules per cubic meter).What would you use for a starting density for hydrogen molecules in a typical IMC ?