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Improved Characterization of the Astrophysical Muon–neutrino Flux with 9.5 Years of IceCube Data

Abbasi, R. ; Ackermann, M.; Adams, J.; Aguilar, J. A.; Ahlers, M.; Ahrens, M.; Alameddine, J. M.; Alispach, C.; Alves Jr., A. A.; Amin, N. M.; Andeen, K.; Anderson, T.; Anton, G.; Argüelles, C.; Ashida, Y.; Axani, S.; Bai, X.; Balagopal V., A.; Barbano, A.; ... mehr

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 ${\phi }_{@100\mathrm{TeV}}^{{\nu }_{\mu }+{\bar{\nu }}_{\mu }}={1.44}_{-0.26}^{+0.25}\times {10}^{-18}\,{\mathrm{GeV}}^{-1}{\mathrm{cm}}^{-2}{{\rm{s}}}^{-1}{\mathrm{sr}}^{-1}$ and a spectral index ${\gamma }_{\mathrm{SPL}}={2.37}_{-0.09}^{+0.09}$, 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. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000145879
Originalveröffentlichung
DOI: 10.3847/1538-4357/ac4d29
Scopus
Zitationen: 69
Web of Science
Zitationen: 60
Dimensions
Zitationen: 76
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.03.2022
Sprache Englisch
Identifikator ISSN: 0004-637X, 1538-4357
KITopen-ID: 1000145879
HGF-Programm 51.13.04 (POF IV, LK 01) Kosmische Strahlung Technologien
Erschienen in The Astrophysical Journal
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 928
Heft 1
Seiten Art.Nr. 50
Nachgewiesen in Dimensions
Web of Science
Scopus
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