Reconnection Diffusion in the Process of Star Formation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The removal of magnetic flux during star formation is the problem that is usually addressed appealing to the ambipolar diffusion. The recent progress in understanding of magnetic reconnection in collisional turbulent environments allows an alternative approach to the problem. In particular, recent numerical simulations confirmed the model of fast magnetic reconnection proposed in Lazarian & Vishniac (1999). I shall discuss how fast reconnection induces fast diffusion of magnetic field and follow the implications of this process on the star formation starting from the evolution of diffuse clouds to the formation of molecular clouds, dark cores and protostars. I shall show that the fast removal of magnetic field can happen from the clouds with high degree of ionization and a number of observational puzzles can be resolved appealing to the reconnection diffusion. In addition, I shall stress that the fast magnetic reconnection of turbulent magnetic fields justifies the application of the numerical techniques to simulating the environments where the normal Ohmic diffusion of magnetic field is enormously long.

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