Star Formation and the Hall Effect

Details Star Formation and the Hall Effect Star Formation and the Hall Effect

2003-07-04

arxiv.org/abs/astro-ph/0307086v1

Astrophys.Space Sci.292:317-323,2004

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, Latex, kluwer.cls. To appear in the proceedings of "Magnetic fields and star formation: theory versus obse

Scientific paper

10.1023/B:ASTR.0000045033.80068.

The breakdown of flux-freezing in molecular clouds and protostellar discs is usually approximated by ambipolar diffusion at low densities or by resistive diffusion at high densities. Here I discuss an intermediate regime in which the Hall term in the conductivity tensor is significant, and the vector evolution of the magnetic field -- and therefore the evolution of the system under consideration -- is dramatically altered. Calculations of charged particle abundances in dense gas in molecular clouds and protostellar discs demonstrate that Hall diffusion is important over a surprisingly broad range of conditions.

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