What mechanism allows the system to shed excess angular momentum and permits the central mass to grow?

Answer

Ejection of highly collimated jets of gas from the poles (bipolar outflows)

Bipolar outflows, perpendicular to the accretion disk, expel some material to shed excess angular momentum, allowing the central mass to continue accreting.

What mechanism allows the system to shed excess angular momentum and permits the central mass to grow?
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