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The magnetic fields affect collapse of molecular cloud cores. Here, weconsider a collapsing core with an axial magnetic field and investigate itseffect on infall of matter and formation of accretion disk. For this purpose,the equations of motion of ions and neutral infalling particles are numericallysolved to obtain the streamlines of trajectories. The results show that innon-steady state of ionization and ion-neutral coupling, which is notunexpected in the case of infall, the radius of accretion disk will be largeras a consequence of axial magnetic field.

Matter Infall in Collapsing Molecular Cloud Cores with an Axial Magnetic Field