Numerical modeling of multiphase, turbulent galactic disks with star formation feedback

Chang Goo Kim, Eve Charis Ostriker, Woong Tae Kim

Research output: Contribution to journalArticle

Abstract

Star formation is self-regulated by its feedback that drives turbulence and heats the gas. In equilibrium, the star formation rate (SFR) should be directly related to the total (thermal plus turbulent) midplane pressure and hence the total weight of the diffuse gas if energy balance and vertical dynamical equilibrium hold simultaneously. To investigate this quantitatively, we utilize numerical hydrodynamic simulations focused on outer-disk regions where diffuse atomic gas dominates. By analyzing gas properties at saturation, we obtain relationships between the turbulence driving and dissipation rates, heating and cooling rates, the total midplane pressure and the total weight of gas, and the SFR and the total midplane pressure. We find a nearly linear relationship between the SFR and the midplane pressure consistent with the theoretical prediction.

Original languageEnglish (US)
Pages (from-to)609-610
Number of pages2
JournalProceedings of the International Astronomical Union
Volume10
Issue numberH16
DOIs
StatePublished - Jan 1 2012

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

Keywords

  • ISM: kinematics and dynamics
  • methods: numerical
  • stars: formation
  • turbulence

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