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SUMMARY:State transitions in Changing-Look AGNs [Astrophysics Seminar]
DTSTART:20260223T100000Z
DTEND:20260223T110000Z
DTSTAMP:20260418T043600Z
UID:indico-event-408@events.iiap.res.in
CONTACT:colloqm@iiap.res.in
DESCRIPTION:Speakers: Biswaraj Palit (Nicolaus Copernicus Astronomical Cen
 ter\, Poland.)\n\nAbstract: The changing-look (CL) behavior in active gal
 actic nuclei (AGNs) is characterized by dramatic changes in the overall br
 ightness of sources\, leading to restructuring of circum-nuclear environme
 nts such as the inner accretion geometry\, broad line region (BLR)\, and o
 utflows. They offer a rare opportunity to witness accretion state transiti
 ons in real time\, akin to those seen in stellar-mass X-ray binaries (XRBs
 ). In this talk\, I will present a decade-long multiwavelength study of th
 e Seyfert galaxy\, which captures a complete spectral state transition--fr
 om a faint\, hard X-ray phase to a bright\, UV- and soft X-ray-dominated s
 tate within just $\\sim$10 years. Using diagnostics like the X-ray loudnes
 s parameter ($\\alpha_{\\rm OX}$) and the hardness--intensity diagram (HID
 )\, we identify a critical Eddington ratio ($\\lambda_{\\rm Edd} \\sim 0.0
 2$) marking the onset of inner accretion flow restructuring. These finding
 s provide strong evidence that CLAGNs trace accretion physics analogous to
  XRBs\, scaled up in mass but compressed in time. \n\nhttps://events.iiap
 .res.in/event/408/
LOCATION:Auditorium
URL:https://events.iiap.res.in/event/408/
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