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SUMMARY:The Optical-to-X-ray continuum variability of AGN: thermal fluctua
 tion rather than reprocessing?
DTSTART;VALUE=DATE-TIME:20230626T103000Z
DTEND;VALUE=DATE-TIME:20230626T104500Z
DTSTAMP;VALUE=DATE-TIME:20260818T030324Z
UID:indico-contribution-861@cern.ch
DESCRIPTION:Speakers: Zhen-Yi Cai ()\nFrom optical to X-ray\, the variable
  continuum emissions of AGN are generally found to be correlated with vari
 ations at longer wavelengths lagging the shorter ones. Both the correlatio
 n and the lag-wavelength relation are usually understood within the widesp
 read X-ray reprocessing scenario. However\, both of them do not always pre
 serve and challenge the reprocessing scenario. In recent years\, we (Cai e
 t al. 2016\, 2018\, 2020) upgrade the inhomogeneous thermal fluctuation mo
 del proposed by Dexter & Agol (2011)\, by introducing a common larger-scal
 e fluctuation (as a result of the propagation and mixing of local fluctuat
 ions\, likely\, by magnetic fields allover the accretion disk) and suggest
 ing a new origin for the continuum lag (as a result of the differential re
 gression capability of local fluctuations responding to the large-scale fl
 uctuation). Now\, the new thermal fluctuation scenario can account for sev
 eral observational properties of AGN variability\, including the correlati
 on and lag across the X-ray/UV/optical and the timescale-dependent color v
 ariation\, and may shed new light on comprehending the UV/optical continuu
 m variations and the relation to X-ray for AGN.\n\nhttps://indico.unina.it
 /event/61/contributions/861/
LOCATION:Centro Congressi Federico II Aula Magna
URL:https://indico.unina.it/event/61/contributions/861/
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