Maximum Spin of Black Holes Driving Jets

Understand

Unbounded outflows in the form of highly collimated jets and broad winds appear to be a ubiquitous feature of accreting black hole systems.

• The most powerful jets are thought to derive a significant fraction, if not the majority, of their power from the rotational energy of the black hole.
• Whatever the precise mechanism that causes them, these jets must therefore exert a braking torque on the black hole.
• We calculate the spin-up function for an accreting black hole, accounting for this braking torque.