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

TL;DR

This study investigates how axial magnetic fields influence matter infall and accretion disk formation in collapsing molecular cloud cores, revealing that magnetic fields can enlarge the disk radius under non-steady ionization conditions.

Contribution

It provides a numerical analysis of ion-neutral dynamics in collapsing cores with magnetic fields, highlighting effects on disk size during non-steady ionization states.

Findings

Magnetic fields increase accretion disk radius.

Non-steady ionization affects infall dynamics.

Magnetic influence varies with ion-neutral coupling.

Abstract

The magnetic fields affect collapse of molecular cloud cores. Here, we consider a collapsing core with an axial magnetic field and investigate its effect on infall of matter and formation of accretion disk. For this purpose, the equations of motion of ions and neutral infalling particles are numerically solved to obtain the streamlines of trajectories. The results show that in non-steady state of ionization and ion-neutral coupling, which is not unexpected in the case of infall, the radius of accretion disk will be larger as a consequence of axial magnetic field.