Evidence against Star-forming Galaxies as the Dominant Source of Icecube Neutrinos

Bechtol, K.; Ahlers, M.; Mauro, Mattia Di; Ajello, M.; Vandenbroucke, J.

doi:10.3847/1538-4357/836/1/47

Cited by 157 publications

(180 citation statements)

References 87 publications

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“…A flux of cosmogenic neutrinos as predicted by Kotera et al (2010) would only contribute subdominantly to the measured astrophysical neutrino flux. Neutrino fluxes from blazars and star-forming galaxies are predicted by e.g., Murase et al (2014) and Bechtol et al (2015), respectively. Glüsenkamp (2016) already constrains this blazar model.…”

Section: Discussionmentioning

confidence: 99%

“…The black crosses corresponds to experimental data and blue/red to the conventional atmospheric/astrophysical expectation weighted to the best-fit spectrum. Figure 5) with theoretical neutrino flux predictions corresponding to different source types (Kotera et al 2010;Murase et al 2014;Bechtol et al 2015;Senno et al 2016). Since Murase et al 2014 predicts a lower and upper flux bound for neutrinos originating from blazars the central line between both bounds is shown.…”

Section: Test For Anisotropies Related To the Galactic Planementioning

confidence: 99%

“…Furthermore, the analysis is mainly sensitive to a muon neutrino flux because of the large muon range. Nevertheless this strategy will impose further constraints on possible models (Cholis & Hooper 2013;He et al 2013;Kalashev et al 2013;Laha et al 2013;Razzaque 2013;Roulet et al 2013;Stecker 2013;Anchordoqui et al 2014;Gonzalez-Garcia et al 2014;Murase et al 2014;Tamborra et al 2014;Bechtol et al 2015;Senno et al 2016) that have been proposed to explain the observed astrophysical neutrino flux.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Observation and Characterization of a Cosmic Muon Neutrino Flux From the Northern Hemisphere Using Six Years of Icecube Data

Aartsen¹,

Abraham²,

Ackermann³

et al. 2016

ApJ

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463

664

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The IceCube Collaboration has previously discovered a high-energy astrophysical neutrino flux using neutrino events with interaction vertices contained within the instrumented volume of the IceCube detector. We present a complementary measurement using charged current muon neutrino events where the interaction vertex can be outside this volume. As a consequence of the large muon range the effective area is significantly larger but the field of view is restricted to the Northern Hemisphere. IceCube data from 2009 through 2015 have been analyzed using a likelihood approach based on the reconstructed muon energy and zenith angle. At the highest neutrino energies between and a significant astrophysical contribution is observed, excluding a purely atmospheric origin of these events at significance. The data are well described by an isotropic, unbroken power-law flux with a normalization at neutrino energy of and a hard spectral index of . The observed spectrum is harder in comparison to previous IceCube analyses with lower energy thresholds which may indicate a break in the astrophysical neutrino spectrum of unknown origin. The highest-energy event observed has a reconstructed muon energy of which implies a probability of less than for this event to be of atmospheric origin. Analyzing the arrival directions of all events with reconstructed muon energies above no correlation with known γ-ray sources was found. Using the high statistics of atmospheric neutrinos we report the current best constraints on a prompt atmospheric muon neutrino flux originating from charmed meson decays which is below 1.06 in units of the flux normalization of the model in Enberg et al.

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Section: Discussionmentioning

confidence: 99%

Section: Test For Anisotropies Related To the Galactic Planementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Observation and Characterization of a Cosmic Muon Neutrino Flux From the Northern Hemisphere Using Six Years of Icecube Data

Aartsen¹,

Abraham²,

Ackermann³

et al. 2016

ApJ

Self Cite

463

664

View full text Add to dashboard Cite

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“…As discussed by various authors (e.g. [87][88][89]), sources which could reproduce the flux of the extragalactic diffuse PeV neutrinos detected with IceCube [90] are at risk of violating the diffuse 1-800 GeV γ-ray background seen by Fermi. Thus, since in our case the neutrino flux is well below the IceCube limits, also the related diffuse GeV γ-ray background is expected to be well below the Fermi limits.…”

Section: Acceleration Site and Possible Neutrino Emissionmentioning

confidence: 99%

Ultrahigh-energy cosmic ray production by turbulence in gamma-ray burst jets and cosmogenic neutrinos

Asano

Mészáros

2016

Phys. Rev. D

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We propose a novel model to produce ultra-high-energy cosmic-rays (UHECRs) in gamma-ray burst (GRB) jets. After the prompt gamma-ray emission, hydrodynamical turbulence is excited in the GRB jets at or before the afterglow phase. The mildly relativistic turbulence stochastically accelerates protons. The acceleration rate is much slower than the usual first-order shock acceleration rate, but in this case it can be energy-independent. The resultant UHECR spectrum is so hard that the bulk energy is concentrated in the highest energy range, resulting in a moderate requirement for the typical cosmic ray luminosity of ∼ 10 53.5 erg s −1 . In this model, the secondary gamma-ray and neutrino emissions initiated by photopion production are significantly suppressed. Although the UHECR spectrum at injection shows a curved feature, this does not conflict with the observed UHECR spectral shape. The cosmogenic neutrino spectrum in the 10 17 -10 18 eV range becomes distinctively hard in this model, which may be verified by future observations.

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“…This limit however is quite model dependent given the strong time variability of blazars. Finally a study on the diffuse extragalactic background as observed by Fermi-LAT, rules out star-burst galaxies as the major component of the neutrino astrophysical flux [16].…”

Section: The Search For Sources Of the Very-high-energy Neutrinosmentioning

confidence: 99%

Very-high-energy astrophysical neutrinos with IceCube

Taboada

2016

EPJ Web Conf.

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Abstract. IceCube is a TeV neutrino observatory operating at the South Pole. IceCube has observed a flux of neutrinos of astrophysical origin, with energies beyond 2 PeV. However the sources of these neutrinos have not yet been identified. A summary of various IceCube observations is presented. The results discussed were obtained through several different analysis methods, which have varying sensitivity to the different neutrino flavors. A discussion of the spectral fit obtained for the various event selections is included, as well as the constraints on the astrophysical neutrino flavor flux ratio. Several attempts by IceCube to identify the sources of these neutrinos are described. These include studies correlating neutrino events with catalogs of sources as well as selfcorrelations among IceCube's neutrinos. The observations of astrophysical neutrinos are limited by statistics. So an upgrade of IceCube, including a larger detector and a surface veto is planned. This upgrade is briefly discussed.

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Evidence against Star-forming Galaxies as the Dominant Source of Icecube Neutrinos

Cited by 157 publications

References 87 publications

Observation and Characterization of a Cosmic Muon Neutrino Flux From the Northern Hemisphere Using Six Years of Icecube Data

Observation and Characterization of a Cosmic Muon Neutrino Flux From the Northern Hemisphere Using Six Years of Icecube Data

Ultrahigh-energy cosmic ray production by turbulence in gamma-ray burst jets and cosmogenic neutrinos

Very-high-energy astrophysical neutrinos with IceCube

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