Hyper-accreting black hole as GRB central engine. I: Baryon loading in GRB jets

Understand

A hyper-accreting stellar-mass black hole has been long speculated as the best candidate of central engine of gamma-ray bursts (GRBs).

• Recent rich observations of GRBs by space missions such as Swift and Fermi pose new constraints on GRB central engine models.
• In this paper, we study the baryon loading processes of a GRB jet launched from a black hole central engine.
• We consider a relativistic jet powered by $\nu \bar\nu$-annihilation or by the Blandford-Znajek (BZ) mechanism.