Collapsar Black Holes are Likely Born Slowly Spinning

Understand

Collapsing stars constitute the main black hole (BH) formation channel, and are occasionally associated with the launch of relativistic jets that power $ \gamma $-ray bursts (GRBs).

• Thus, collapsars offer an opportunity to infer the natal (before spin-up/down by accretion) BH spin directly from observations.
• We show that once the BH saturates with large-scale magnetic flux, the jet power is dictated by the BH spin and mass accretion rate.
• Core-collapse simulations by Halevi et al.