Quenching massive galaxies across cosmic time with the semi-analytic model SHARK v2.0

Understand

We introduce version 2.0 of the SHARK semi-analytic model of galaxy formation after many improvements to the physics included.

• The most significant being: (i) a model describing the exchange of angular momentum (AM) between the interstellar medium and stars; (ii) a new active galactic nuclei feedback model which has two modes, a wind and a jet mode, with the jet mode tied to the jet energy production; (iii) a model tracking the development of black hole (BH) spins; (iv) more sophisticated modelling of environmental effects on satellite galaxies; and (v) automatic parameter exploration using Particle Swarm Optimisation.
• We focus on two timely research topics: the structural properties of galaxies and the quenching of massive galaxies.
• For the former, SHARK v2.0 is capable of producing a more realistic stellar size-mass relation with a plateau marking the transition from disk- to bulge-dominated galaxies, and scaling relations between specific AM and mass that agree well with observations.