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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-9310
DTSTART:20250707T160000Z
DTEND:20250707T180000Z
DTSTAMP:20260410T233011Z
LAST-MODIFIED:20250617T180948Z
LOCATION:5280 CH
SUMMARY:Cross Correlation of IceCube Neutrinos with Tracers of Large S
 cale Structure\, Graduate Program Event\, David Guevel\, Physics PhD G
 raduate Student
DESCRIPTION:Multi-messenger astrophysics aims to study energetic astro
 physical environments using physical channels that have historically b
 een inaccessible. Technological developments have created new opportun
 ities to detect neutrinos\, cosmic rays\, and gravitational waves from
  distant astrophysical environments. Neutrinos are unique among these 
 messengers because they are produced in large numbers in energetic env
 ironments and because they propagate through interstellar and intergal
 actic space with little interaction along the way preserving the infor
 mation about their sources. The IceCube Neutrino Observatory has disco
 vered astrophysical neutrinos from extragalactic\, and galactic source
 s and unresolved background sources. The accelerators that produce the
  energetic extragalactic neutrinos likely trace the large-scale struct
 ure\, so the diffuse astrophysical neutrino flux may exhibit anisotrop
 y similar to other large-scale structure tracers though no anisotropy 
 has been detected in the diffuse neutrino flux. Galaxies\, detected in
  infrared observations\, are well-suited to be used as tracers of larg
 e-scale structure. This thesis presents a two-point angular cross-corr
 elation between IceCube neutrinos and an infrared galaxy catalog. This
  angular correlation required novel modifications to include the effec
 ts IceCube's declination and energy dependent effective area and point
  spread function while also accounting for multipole coupling caused b
 y the use of a galactic plane mask. Despite improvements in the sensit
 ivity to anisotropy\, no statistically significant correlation was obs
 erved. The upper limit on the correlation strength is used to place co
 nstraints on the share of the diffuse neutrino flux that can be contri
 buted from source correlated with the local large-scale structure. If 
 the neutrino spectral energy distribution follows a power law with a s
 pectral index held fixed to the diffuse muon neutrino measurement\, th
 e correlated sources can contribute no more than 54% of the diffuse mu
 on neutrino flux. The correlation upper limit rules out nearby source 
 populations while allowing more distant evolution models\, such as tho
 se tracing the star-formation rate. The next generation of ice Cherenk
 ov detectors such as IceCube Gen2 will be capable of constraining the 
 correlation with three times the precision and potentially detecting a
 nisotropy in the diffuse neutrino flux.
URL:https://www.physics.wisc.edu/events/?id=9310
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