期刊
PHYSICAL REVIEW D
卷 89, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.89.127304
关键词
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资金
- US NSF [CAREER PHY-1053663, PHY-1205854]
- NASA [NNX13AH52G]
- UWM Physics Summer Research Award
- UWM RGI
- [AYA2012-39303]
- ICREA Funding Source: Custom
- NASA [473895, NNX13AH52G] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1153335] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1053663] Funding Source: National Science Foundation
Very recently, the IceCube Collaboration reported a flux of neutrinos in the energy range 50 TeV less than or similar to E-v less than or similar to 2 Pev, which departs from expectations from atmospheric background at the 5.7 sigma level. This flux is in remarkable agreement with the expected diffuse flux of neutrinos from starburst galaxies, and the three highest energy events have uncertainty contours encompassing some of such systems. These events, all of which have well-measured energies above 1 PeV, exhibit shower topologies, for which the angular resolution is about 15 degrees. Due to this angular uncertainty and the a posteriori nature of cuts used in our study, it is not possible to assign a robust statistical significance to this association. Using muon tracks, which have angular resolution < 1 degrees, we compute the number of observations required to make a statistically significant statement and show that in a few years of operation the upgraded IceCube detector should be able to confirm or refute this hypothesis. We also note that double bang topology rates constitute a possible discriminator among various astrophysical sources.
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