Hostname: page-component-8448b6f56d-xtgtn Total loading time: 0 Render date: 2024-04-21T06:31:42.834Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  05 March 2015

Chang-Goo Kim
Affiliation:
Department of Physics & Astronomy, Western University, Canada email: ckim256@uwo.ca
Eve C. Ostriker
Affiliation:
Department of Astronomy, University of Maryland, USA Astrophysical Sciences, Princeton University, USA
Woong-Tae Kim
Affiliation:
Department of Physics & Astronomy, Seoul National University, Republic of Korea
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

Kim, C.-G., Kim, W.-T., & Ostriker, E. C. 2011, ApJ 743, 25CrossRefGoogle Scholar
Krumholz, M. R., Dekel, A., & McKee, C. F. 2012, ApJ 745, 69CrossRefGoogle Scholar
Ostriker, E. C., McKee, C. F., & Leroy, A. K. 2010, ApJ 721, 975Google Scholar
Ostriker, E. C. & Shetty, R. 2011, ApJ 731, 41CrossRefGoogle Scholar
Wolfire, M. G., Hollenbach, D., McKee, C. F., Tielens, A. G. G. M., & Bakes, E. L. O. 1995, ApJ 443, 152CrossRefGoogle Scholar