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SUMMARY:Review: Extreme variability around supermassive black holes: Quasi
  Periodic Eruptions
DTSTART;VALUE=DATE-TIME:20230629T131500Z
DTEND;VALUE=DATE-TIME:20230629T134500Z
DTSTAMP;VALUE=DATE-TIME:20260519T000613Z
UID:indico-contribution-904@cern.ch
DESCRIPTION:Speakers: Margherita Giustini (Centro de Astrobiología (CAB)\
 , CSIC-INTA\, Spain)\nSerendipitously discovered at the end of 2018 in the
  nucleus of the galaxy GSN 069\, X-ray quasi-periodic eruptions (QPEs) are
  a new extreme-variability phenomenon associated with supermassive black h
 oles. QPEs typically appear as sharp and intense burst of X-ray emission\,
  with a thermal-like spectrum with a temperature $kT \\sim 150$ eV over a 
 much more stable and cooler quiescent level\; they last about one hour and
  repeat quasi-periodically every few hours\, carrying a few $10^{42-43}$ e
 rg s$^{-1}$ at each burst. X-ray QPEs have been securely detected in the n
 uclei of several galaxies since their discovery\, all with low-mass superm
 assive black holes ($M_{BH} < 10^7 M_{\\odot}$) and different levels of nu
 clear activity. In this talk I will review the general properties of QPEs 
 and their variegate phenomenology in the QPE-sources (up to 7) detected so
  far. I will then discuss the physical scenarios invoked to explain this n
 ew and puzzling extreme-variability X-ray phenomenon\, as well as the more
  and more evident physical connection of QPEs with tidal disruption events
  (TDEs) in low-mass galaxies.\n\nhttps://indico.unina.it/event/61/contribu
 tions/904/
LOCATION:Centro Congressi Federico II Aula Magna
URL:https://indico.unina.it/event/61/contributions/904/
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