MHD Turbulence in Star-Forming Clouds

Details MHD Turbulence in Star-Forming Clouds MHD Turbulence in Star-Forming Clouds

1999-11-03

arxiv.org/abs/astro-ph/9911048v1

Astronomy and Astrophysics

Astrophysics

nine pages, four postscript figures, in press in Optical and Infrared Spectroscopy of Circumstellar Matter, eds. S. Klose, E.

Scientific paper

We review how supersonic turbulence can both prevent and promote the collapse of molecular clouds into stars. First we show that decaying turbulence cannot significantly delay collapse under conditions typical of molecular clouds, regardless of magnetic field strength so long as the fields are not supporting the cloud magnetohydrostatically. Then we review possible drivers and examine simulations of driven supersonic and trans Alfv\'enic turbulence, finally including the effects of self-gravity. Our preliminary results show that, although turbulence can support regions against gravitational collapse, the strong compressions associated with the required velocities will tend to promote collapse of local condensations.

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