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SUMMARY:The Awakening Beast in the Seyfert 1 Galaxy KUG 1141+371 - Jiachen
  Jiang
DTSTART:20220608T121500Z
DTEND:20220608T124500Z
UID:TALK175454@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:KUG 1141+371 is a Seyfert 1 galaxy that shows a simultaneous f
 lux increase in the optical and UV bands in the past decade. For instance\
 , the Swift observations in 2019 show that the UVW2 flux of the AGN in KUG
  1141+371 has increased by over one order of magnitude since 2009. Meanwhi
 le\, the soft X-ray flux of KUG 1141+371 also shows a steady increase by a
 lmost one order of magnitude from 2007 to 2019. The significant multi-wave
 length luminosity change is likely due to a boost in mass accretion rate f
 rom approximately 0.6% of the Eddington limit to 3.2%\, assuming a black h
 ole mass of 100 million solar masses. \nI will present a detailed multi-ep
 och X-ray spectral analysis focusing on the variability of the X-ray conti
 nuum emission and the puzzling soft excess emission. In addition\, our SED
  models also suggest a simultaneous increase in disc temperature and a dec
 reasing inner disc radius along with the increasing accretion rate. Simult
 aneous ground-based optical observations show significant changes in the p
 ermitted line profiles and optical continuum. Finally\, I will discuss the
  possible connection between KUG 1141+371 and black hole transients in out
 burst.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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