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Fragmentation of magnetically-supported, weakly-ionized molecular clouds

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Title: Fragmentation of magnetically-supported, weakly-ionized molecular clouds
Author(s): Christie, Duncan A.
Director of Research: Mouschovias, Telemachos C.
Doctoral Committee Chair(s): Stack, John
Doctoral Committee Member(s): Mouschovias, Telemachos C.; Wandelt, Benjamin; Looney, Leslie
Department / Program: Physics
Discipline: Physics
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: Ph.D.
Genre: Dissertation
Subject(s): molecular clouds magnetic fields ambipolar diffusion star formation
Abstract: We follow the evolution and fragmentation of isolated, magnetically-supported, weakly- ionized, self-gravitating molecular clouds in three dimensions. Although the model clouds are supported by the magnetic field, high-density, magnetically-supercritical fragments form due to the drift between the ions and the neutrals, ambipolar diffusion. To follow the evolution of the model clouds, we extended the publicly-available Zeus-MP code to include the effects of nonideal magnetohydrodynamics and have modified several algo- rithms to improve accuracy and convergence. We present the results of a parameter study which varies the ionization fraction, mass-to-flux ratio, and velocity perturbation in the model clouds.
Issue Date: 2011-05-25
URI: http://hdl.handle.net/2142/24373
Rights Information: Copyright 2011 Duncan A. Christie
Date Available in IDEALS: 2011-05-25
2013-05-26
Date Deposited: 2011-05
 

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