Effects of magnetic fields on the stability of a differentially rotating disk are considered in the shearing sheet approximation.An explicit stability criterion is derived in terms of Toomre's Q value and the field strength.The combined effects of both magnetic fields and a corotating dark matter halo are briefly discussed.
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机译：Magnetized Accreting Stars: Studies of the Inner Accretion-Disk Edge by a Magnetohydrodynamic Approach. II. Ideal Instabilities of the Inner Disk Edge
