dc.creator | Aartsen, M. G. | |
dc.creator | Abraham, K. | |
dc.creator | Ackermann, M. | |
dc.creator | Adams, J. | |
dc.creator | Aguilar, J. A. | |
dc.creator | Golup, Geraldina Tamara | |
dc.creator | Wallraff, M. | |
dc.creator | Wandkowsky, N. | |
dc.creator | Weaver, Ch. | |
dc.creator | Wendt, C. | |
dc.creator | Westerhoff, S. | |
dc.creator | Whelan, B. J. | |
dc.creator | Whitehorn, N. | |
dc.creator | Wichary, C. | |
dc.creator | Wiebe, K. | |
dc.creator | Wiebusch, C. H. | |
dc.creator | Wille, L. | |
dc.creator | Williams, D. R. | |
dc.creator | Wissing, H. | |
dc.creator | Wolf, M. | |
dc.creator | Wood, T. R. | |
dc.creator | Woschnagg, K. | |
dc.creator | Xu, D. L. | |
dc.creator | Xu, X. W. | |
dc.creator | Xu, Y. | |
dc.creator | Yanez, J. P. | |
dc.creator | Yodh, G. | |
dc.creator | Yoshida, S. | |
dc.creator | Zarzhitsky, P. | |
dc.creator | Zoll, M. | |
dc.creator | The IceCube Collaboration | |
dc.date.accessioned | 2018-10-22T14:47:00Z | |
dc.date.available | 2018-10-22T14:47:00Z | |
dc.date.created | 2018-10-22T14:47:00Z | |
dc.date.issued | 2015-08-13 | |
dc.identifier | Aartsen, M. G.; Abraham, K.; Ackermann, M.; Adams, J.; Aguilar, J. A.; et al.; A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube; IOP Publishing; Astrophysical Journal; 809; 1; 13-8-2015; 1-16 | |
dc.identifier | 0004-637X | |
dc.identifier | http://hdl.handle.net/11336/62855 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.description.abstract | Evidence for an extraterrestrial flux of high-energy neutrinos has now been found in multiple searches with the IceCube detector. The first solid evidence was provided by a search for neutrino events with deposited energies > 30 TeV and interaction vertices inside the instrumented volume. Recent analyses suggest that the extraterrestrial flux extends to lower energies and is also visible with throughgoing, νμ-induced tracks from the Northern Hemisphere. Here, we combine the results from six different IceCube searches for astrophysical neutrinos in a maximum-likelihood analysis. The combined event sample features high-statistics samples of shower-like and track-like events. The data are fit in up to three observables: energy, zenith angle, and event topology. Assuming the astrophysical neutrino flux to be isotropic and to consist of equal flavors at Earth, the all-flavor spectrum with neutrino energies between 25 TeV and 2.8 PeV is well described by an unbroken power law with best-fit spectral index −2.50 ± 0.09 and a flux at 100 TeV of ({6.7}_{-1.2}^{+1.1})\times {10}^{-18}\;{\mathrm{GeV}}^{-1}\;{{\rm{s}}}^{-1}\;{\mathrm{sr}}^{-1}\;{\mathrm{cm}}^{-2}. Under the same assumptions, an unbroken power law with index −2 is disfavored with a significance of 3.8σ (p = 0.0066%) with respect to the best fit. This significance is reduced to 2.1σ (p = 1.7%) if instead we compare the best fit to a spectrum with index −2 that has an exponential cut-off at high energies. Allowing the electron-neutrino flux to deviate from the other two flavors, we find a νe fraction of 0.18 ± 0.11 at Earth. The sole production of electron neutrinos, which would be characteristic of neutron-decay-dominated sources, is rejected with a significance of 3.6σ (p = 0.014%). | |
dc.language | eng | |
dc.publisher | IOP Publishing | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/809/1/98 | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/0004-637X/809/1/98 | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1507.03991 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.subject | Neutrinos | |
dc.subject | Astroparticle Physics | |
dc.subject | Methods: Data Analysis | |
dc.title | A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube | |
dc.type | info:eu-repo/semantics/article | |
dc.type | info:ar-repo/semantics/artículo | |
dc.type | info:eu-repo/semantics/publishedVersion | |