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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-9871
DTSTART:20261130T200000Z
DTEND:20261130T220000Z
DTSTAMP:20260925T185401Z
LAST-MODIFIED:20260924T154255Z
LOCATION:Chamberlin 5280
SUMMARY:IceCube and Neutrino Astronomy\, Preliminary Exam\, Chen Li
DESCRIPTION:Recent IceCube observations of active galaxies\, namely NG
 C 1068\, TXS 0506+056\, NGC 4151\, CGCG 420-015\, NGC 7469 and the Cir
 cinus Galaxy\, provide compelling evidence for high-energy neutrino pr
 oduction within the innermost regions ($\\lesssim 10$ gravitational ra
 dii) of supermassive black holes (SMBHs) embedded in the corona region
 \, a dense\, X-ray-emitting plasma. In the corona region\, protons acc
 elerated near the SMBH interact $0.1 - 1\\text{ keV}$ X-rays via $\\De
 lta$-resonance photoproduction and $pp$ interaction to generate neutri
 nos. At the same time\, the X-ray radiation field attenuates the gamma
 -ray flux produced by neutral pion decay. Finally\, we evaluate the hy
 pothesis that such gamma-ray-obscured nuclei constitute the primary po
 pulation responsible for the diffuse neutrino flux.
URL:https://www.physics.wisc.edu/events/?id=9871
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