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SUMMARY:A multi-scale exploration of supermassive black holes in the multi
 -messenger era - Sophie Koudmani (University of Hertfordshire)
DTSTART:20250303T113000Z
DTEND:20250303T123000Z
UID:TALK226969@talks.cam.ac.uk
CONTACT:Steven Brereton
DESCRIPTION:Supermassive black holes (SMBHs) are central to the evolution 
 of massive\, if not all\, galaxies\, driving a complex feedback cycle acro
 ss an extraordinary range of scales\, from the accretion disc to the cosmi
 c web. Recent observations\, particularly from the James Webb Space Telesc
 ope (JWST)\, have uncovered SMBHs in lower-mass galaxies and at higher red
 shifts than predicted\, challenging existing theoretical models. In this t
 alk\, I will present the latest advancements in modelling active galactic 
 nuclei (AGN) feedback from SMBHs across a range of galaxy masses and cosmi
 c epochs. Using high-resolution cosmological zoom-in simulations\, we have
  investigated the profound effects of AGN feedback on dwarf galaxy evoluti
 on\, including outflows\, quenching\, and cusp-to-core transformations. Mo
 tivated by these results\, we conducted large-volume cosmological simulati
 ons to explore whether variations in accretion and seeding models may expl
 ain JWST's overmassive early-universe SMBHs. Despite these insights\, sign
 ificant uncertainties remain\, particularly in accretion rates\, as many m
 odels inherently suppress AGN activity in low-mass systems. To address the
 se gaps\, we have developed a novel\, unified accretion disc model for SMB
 Hs\, which self-consistently predicts their mass and spin evolution. This 
 model integrates principles from the advection-dominated inflow-outflow so
 lution (ADIOS) and state-of-the-art GR(R)MHD simulations. Validated throug
 h idealised simulations of single and binary SMBHs\, our findings demonstr
 ate that the choice of accretion disc model critically affects predictions
  for electromagnetic counterparts and the spin properties of SMBHs\, which
  will be constrained by gravitational wave observatories like LISA and IPT
 A. This underscores the need for multi-scale SMBH models to fully leverage
  the potential of high-redshift and multi-messenger surveys.
LOCATION:Hoyle Lecture Theatre\, Institute of Astronomy (In-person/Streame
 d)
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