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SUMMARY:The role of AGN feedback in dwarf galaxies - Sophie Koudmani (IoA)
DTSTART:20211124T134500Z
DTEND:20211124T141500Z
UID:TALK166456@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Contrary to the standard lore\, there is mounting observationa
 l evidence that feedback from active galactic nuclei (AGN) may also play a
  role at the low-mass end of the galaxy population. In this talk\, I will 
 explore that possibility\, employing both cosmological boxes and high-reso
 lution cosmological zoom-in simulations of dwarf galaxies.\n \nFirstly\, I
  will focus on the dwarf AGN population in the cosmological simulation sui
 te FABLE. While in the local Universe the majority of AGN in dwarfs are mu
 ch dimmer than the stellar component\, for z ≥ 2 there is a significant 
 AGN population that outshine their hosts and contribute to the suppression
  of star formation. Our results are overall in good agreement with X-ray o
 bservations of AGN in dwarfs\, and we predict that future observations (in
 cluding JWST\, RST\, Athena and Lynx) may uncover many more AGN in dwarfs 
 with lower luminosities and at higher redshifts.\n \nTo examine AGN activi
 ty in dwarfs in more detail\, we have performed a series of high-resolutio
 n zoom-in simulations\, varying the AGN prescription and supernova (SN) en
 ergetics. We find that there are sufficient amounts of gas to power brief\
 , Eddington-limited accretion episodes in dwarf galaxies. These episodes h
 ave a profound effect on the large-scale outflows\, increasing outflow tem
 peratures and velocities\, which could be probed by future observations wi
 th JWST NIRSpec. The AGN-boosted outflows heat the circumgalactic medium a
 nd regulate star formation via maintenance-mode feedback\, with the most s
 ignificant impact at high redshifts\, where SN feedback alone cannot suppr
 ess cosmic inflows efficiently.
LOCATION:The Hoyle Lecture Theatre (sign-up needed) + Zoom - Details will 
 be sent by email
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