The Host Galaxy of a Dormant, Overmassive Black Hole at z=6.7 May Be Restarting Star Formation

JWST is discovering a large population of z>4 supermassive black holes (SMBHs) that are overmassive with respect to the stellar content of their hosts. A previous study developed a physical model to interpret this overmassive population as the result of quasar feedback acting on a compact host galaxy. In this Note, we apply this model to JADES GN 1146115, a dormant supermassive black hole at z=6.7 whose mass is ∼40% of the host's mass in stars and accreting at ∼2% of the Eddington limit. The host has been forming stars at the low rate of ∼ 1 M_⊙ yr^-1 for the past ∼ 100 Myr. Our model suggests that this galactic system is on the verge of a resurgence of global star formation activity. This transition comes after a period of domination by the effect of its overmassive black hole, whose duration is comparable to typical quasar lifetimes.