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Journal article
Improved Characterization of the Astrophysical Muon-neutrino Flux with 9.5 Years of IceCube Data
The Astrophysical journal, v 928(1)
2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We present a measurement of the high-energy astrophysical muon-neutrino flux with the IceCube Neutrino Observatory. The measurement uses a high-purity selection of 650k neutrino-induced muon tracks from the northern celestial hemisphere, corresponding to 9.5 yr of experimental data. With respect to previous publications, the measurement is improved by the increased size of the event sample and the extended model testing beyond simple power-law hypotheses. An updated treatment of systematic uncertainties and atmospheric background fluxes has been implemented based on recent models. The best-fit single power-law parameterization for the astrophysical energy spectrum results in a normalization of phi(nu mu+(nu) over bar mu)(@ 00TeV) = 1.441(-0.26)(+0.25 )x 10(-18) GeV(-1)cm(-2) s(-1 )sr(-1) and a spectral index gamma(SPL) = 2.37(-0.09)(+0.09), constrained in the energy range from 15 TeV to 5 PeV. The model tests include a single power law with a spectral cutoff at high energies, a log-parabola model, several source-class-specific flux predictions from the literature, and a model-independent spectral unfolding. The data are consistent with a single power-law hypothesis, however, spectra with softening above one PeV are statistically more favorable at a two-sigma level.
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Details
- Title
- Improved Characterization of the Astrophysical Muon-neutrino Flux with 9.5 Years of IceCube Data
- Creators
- Maryon Ahrens - Oskar Klein-centrum för kosmopartikelfysik (OKC)Kunal Deoskar - Oskar Klein-centrum för kosmopartikelfysik (OKC)Chad Finley - Oskar Klein-centrum för kosmopartikelfysik (OKC)Klas Hultqvist - Oskar Klein-centrum för kosmopartikelfysik (OKC)Matti Jansson - Oskar Klein-centrum för kosmopartikelfysik (OKC)Christian Walck - Oskar Klein-centrum för kosmopartikelfysik (OKC)IceCube Collaboration
- Publication Details
- The Astrophysical journal, v 928(1)
- Publisher
- Institute of Physics (IOP)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000780370800001
- Scopus ID
- 2-s2.0-85128155836
- Other Identifier
- 991019168710204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics