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Massive quiescent galaxies (MQGs) are thought to have formed stars rapidly atearly times followed by a long period of quiescence. The recent discovery of aMQG, ZF-COSMOS-20115 at $z\sim4$, only 1.5 Gyr after the big bang, places newconstraints on galaxy growth and the role of feedback in early star formation.Spectroscopic follow-up confirmed ZF-COSMOS-20115 as a MQG at $z=3.717$ with anestimated stellar mass of ${\sim}10^{11}\mathrm{M}_\odot$, showing no evidenceof recent star formation. We use the Meraxes semi-analytic model to investigatehow ZF-COSMOS-20115 analogues build stellar mass, and why they becomequiescent. We identify three analogue galaxies with similar properties toZF-COSMOS-20115. We find that ZF-COSMOS-20115 is likely hosted by a massivehalo with virial mass of ${\sim}10^{13}\mathrm{M}_\odot$, having been throughsignificant mergers at early times. These merger events drove intense growth ofthe nucleus, which later prevented cooling and quenched star formation.ZF-COSMOS-20115 likely remained quiescent at $z<3.7$. We find that theanalogues host the most massive black holes in our simulation and were luminousquasars at $z\sim5$, indicating that ZF-COSMOS-20115 and other MQGs may be thedescendants of high-redshift quasars. In addition, the model suggests thatZF-COSMOS-20115 formed in a region of intergalactic medium that was reionizedearly.

Dark-ages Reionization and Galaxy Formation Simulation - XIII. AGN quenching of high-redshift star formation in ZF-COSMOS-20115