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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2856
DTSTART:20130124T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T094441Z
LAST-MODIFIED:20130109T151300Z
LOCATION:4274 Chamberlin Hall 
SUMMARY:AGN as Multi-Messenger Probes of the High-Energy Universe: Obs
 ervations with the HAWC Observatory\, NPAC (Nuclear/Particle/Astro/Cos
 mo) Forum\, Asif Imran\, Los Alamos National Lab
DESCRIPTION:Ground-based gamma-ray observatories have opened up a new 
 window into the high-energy universe. To date\, exciting results repor
 ted by experiments such as VERITAS\, H.E.S.S.\, and Milagro include th
 e the detection of photons from nearly 50 relativistic AGN jets at TeV
  energies. However\, the picture of the universe beyond 1 TeV is far f
 rom complete. The origin and composition of the extra-galactic ultrahi
 gh energy cosmic rays (UHECR) remains a central problems in astrophysi
 cs. Based on energy considerations\, recent studies have argued that h
 ighly relativistic jets in AGNs are the best candidates for the sites 
 of UHECR acceleration. Consequently\, we may be able to observe >20 Te
 V emission from nearby AGN contrary to conventional models that predic
 t significant attenuations of the source gamma-ray photons via the dif
 fuse extragalactic background light. The High Altitude Water Cherenkov
  (HAWC) observatory\, a next-generation ground-based particle shower d
 etector will be sensitive to photon energies from 50 GeV to 100 TeV wi
 th angular resolution of 0.3 degrees at E> 1 TeV. HAWC's high duty cyc
 le (~100%) and wide field of view (~2 sr) is ideal to test AGN as poss
 ible sites for the acceleration of UHECR. Furthermore\, HAWC's observa
 tions of an orphan flare from AGN coupled with the detection of coinci
 dent neutrinos by the IceCube observatory with allow us to independent
 ly probe the acceleration of UHECR in AGN.<br>
\n<br>
\nIn this talk\,
  I will give an overview of the mechanism for the production of high e
 nergy photons from UHECR-induced cascade emission along with an update
  on the current status of the HAWC observatory. I'll also present the 
 sensitivity of the HAWC detector to TeV emission from AGN.
URL:https://www.physics.wisc.edu/events/?id=2856
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