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The question of what regulates star formation is a long standing issue. Toinvestigate this issue, we run simulations of a kiloparsec cube section of agalaxy with three kinds of stellar feedback: the formation of HII regions, theexplosion of supernovae, and the UV heating. We show that stellar feedback issufficient to reduce the averaged star formation rate (SFR) to the level of theSchmidt- Kennicutt law in Milky-Way like galaxies but not in high-redshift gasrich galaxies suggesting that another type of support should be added. Weinvestigate whether an external driving of the turbulence such as the onecreated by the large galactic scales could diminish the SFR at the observedlevel. Assuming that the Toomre parameter is close to 1 as suggested by theobservations, we infer a typical turbulent forcing that we argue should beapplied parallel to the plane of the galactic disc. When this forcing isapplied in our simulations, the SFR within our simulations closely follows theSchmidt- Kennicutt relation. We found that the velocity dispersion is stronglyanisotropic with the velocity dispersion alongside the galactic plane being upto 10 times larger than the perpendicular velocity.

Large-scale turbulent driving regulates star formation in high-redshift gas-rich galaxies