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Ambipolar Diffusion Effects on Weakly Ionized Turbulence Molecular Clouds

  • Pak Shing Li (a1), Christopher F. McKee (a2) and Richard I. Klein (a3)

Abstract

Ambipolar diffusion (AD) is a key process in molecular clouds (MCs). Non-ideal MHD turbulence simulations are technically very challenging because of the large Alfvén speed of ions in weakly ionized clouds. Using the Heavy-Ion Approximation method (Li, McKee & Klein 2006), we have carried out two-fluid simulations of AD in isothermal, turbulent boxes at a resolution of 5123, to investigate the effect of AD on the weakly ionized turbulence in MCs. Our simulation results show that the neutral gas component of the two-fluid system gradually transforms from an ideal MHD turbulence system to near a pure hydrodynamic turbulence system within the standard AD regime, in which the neutrals and ions are coupled over a flow time. The change of the turbulent state has a profound effect on the weakly ionized MCs.

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References

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Crutcher, R. M. 1999, ApJ, 520, 706
Li, P. S., McKee, C. F., & Klein, R. I. 2006, ApJ, 653, 1280
Li, P. S., McKee, C. F., Klein, R. I., & Fisher, R. T. 2008, ApJ, 684, 380
Li, P. S., McKee, C. F., & Klein, R. I. 2010, in preparation
McKee, C. F., Li, P. S., & Klein, R. I. 2010, ApJ, accepted, arXiv:1007.2032
Mac Low, M.-M. & Smith, M. D. 1997, ApJ, 491, 596
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