Core formation in high-z massive haloes: heating by post-compaction satellites and response to AGN outflows

ABSTRACT Observed rotation curves in star-forming galaxies indicate a puzzling dearth of dark matter extended flat cores within haloes mass ?1012M? at z ? 2. This is not reproduced by current cosmological simulations, and supernova-driven outflows are effective such massive haloes. We address hybrid scenario where post-compaction merging satellites heat up the dark-matter cusps dynamical friction, allowing active galactic nucleus (AGN)-driven to generate cores. Using analytic semi-analytic models (SatGen), we estimate friction heating as function satellite compactness for sequence mergers. Cosmological simulations (VELA) demonstrate that initial virial masses >1011.3M?, which undergo wet compactions, become sufficiently compact significant heating. Constituting major fraction accretion on ?1012M?, these half time model outflow-driven core formation (CuspCore), heated develop response removal gas mass, while more stellar systems remain intact. The mergers keep hot, supply, fresh recycled, sufficient AGN outflows. AGNs indeed black hole growth no longer suppressed supernovae its compaction-driven rapid maintained hot circumgalactic medium. For reproduce effects, they should resolve compaction avoid artificial tidal disruption. feedback could be boosted clumpy AGN.