Galactic nuclei evolution with spinning black holes: method and implementation

Understand

Supermassive black holes at the centre of galactic nuclei mostly grow in mass through gas accretion over cosmic time.

• This process also modifies the angular momentum (or spin) of black holes, both in magnitude and in orientation.
• Despite being often neglected in galaxy formation simulations, spin plays a crucial role in modulating accretion power, driving jet feedback, and determining recoil velocity of coalescing black hole binaries.
• We present a new accretion model for the moving-mesh code {\sc arepo} that incorporates (i) mass accretion through a thin $\alpha$-disc, and (ii) spin evolution through the Bardeen-Petterson effect.