RSAA Colloquia / Seminars / Feast-of-Facts: Friday, 10 November 2017, 15:00-15:20; Duffield Lecture Theatre

Ella Wang

"Black Hole Seeding in Cosmological Simulations"

Current cosmological simulations studying galaxy evolution include a model for AGN feedback that seeds black holes with mass >10^5 h^-1 M_sun when the dark matter halo exceeds a given threshold mass. Taylor & Kobayashi (2014) introduced a new model, which seeds black holes at a lower mass based on gas properties. Under the same dark matter halo mass, black holes in Taylor & Kobayashi reach 10^5.21 h^-1 M_sun, whilst black holes in other simulations have just been seeded with mass 10^5 h^-1 M_sun. This implies that black holes with a smaller seed mass exhibit a higher accretion rate and produce more feedback energy than black holes with a larger seed mass under the same conditions. Seeding black holes with seed mass 10^5.21 h^-1 M_sun, under the same dark matter halo mass, could inform more physically motivated results for cosmological simulations.