Journal
ASTROPHYSICAL JOURNAL
Volume 914, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/abf830
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Funding
- UCLA College Honors Programs
- U.S. Department of Energy (DOE) [DE-SC0009937]
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- Japan Society for the Promotion of Science (JSPS) KAKENHI Grant [JP20H05853]
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Observations from the IceCube neutrino observatory over the past decade have shown a neutrino sky that does not align with previous expectations for neutrino point-source emissions, leading to a reassessment of the assumed transport and production physics. A new physical explanation for neutrino production from populations of active galactic nuclei and starburst galaxies has been applied to three years of public IceCube point-source data.
In 10 years of observations, the IceCube neutrino observatory has revealed a neutrino sky in tension with previous expectations for neutrino point-source emissions. Astrophysical objects associated with hadronic processes might act as production sites for neutrinos, observed as point sources at Earth. Instead, a nearly isotropic flux of astrophysical neutrinos is observed up to PeV energies, prompting a reassessment of the assumed transport and production physics. This work applies a new physical explanation for neutrino production from populations of active galactic nuclei and starburst galaxies to three years of public IceCube point-source data. Specifically, cosmic rays produced at such sources might interact with extragalactic background light and gas along the line of sight, generating a secondary neutrino flux. This model is tested alongside a number of typical flux weighting schemes, in all cases the all-sky flux contribution being constrained to percent levels of the reported IceCube diffuse astrophysical flux.
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