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SUMMARY:Feeding and feedback from little monsters: black holes in dwarf ga
 laxies - Mar Mezcua (ISS Barcelona)
DTSTART:20210205T113000Z
DTEND:20210205T123000Z
UID:TALK156151@talks.cam.ac.uk
CONTACT:Ricarda Beckmann
DESCRIPTION:Supermassive black holes of 10E10 solar masses already existed
  when the Universe was only 0.8 Gyr old. To reach this mass they should ha
 ve started as seed intermediate-mass black holes (IMBHs) of 100-10E6 solar
  masses. Detecting such IMBHs in the early Universe is extremely challengi
 ng\; however\, those that did not grow into supermassive black holes shoul
 d be found in local dwarf galaxies resembling the first galaxies formed at
  early epochs. \n\nI will show that a population of actively accreting IMB
 Hs exists in local dwarf galaxies and that they can be detected out to z~3
  with the use of deep multiwavelength surveys like COSMOS. The black hole 
 occupation fraction of these dwarf galaxies suggests that the early Univer
 se seed black holes formed from direct collapse of pre-galactic gas disk\,
  which is reinforced by the finding that the M-sigma relation flattens at 
 the low-mass end. This scenario is however challenged by the recent findin
 g that AGN feedback can have a very strong impact on dwarf galaxies (e.g. 
 in the form of jet mechanical feedback)\, which implies that those AGN hos
 ted in dwarf galaxies might not be the untouched relics of the early seed 
 black holes. This has important implications for seed black hole formation
  models. 
LOCATION:via zoom 
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