Interpretation of neutrino flux limits from neutrino telescopes on the Hillas plot

Winter, Walter

doi:10.1103/physrevd.85.023013

Cited by 9 publications

(5 citation statements)

References 55 publications

(112 reference statements)

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“…It is expected that the full scale experiment may detect neutrinos in such a case, but the interplay with the (energy-dependent) detector response becomes important (see ref. [71] for a more detailed discussion). For instance, better information may be obtained from down-going than upgoing muon tracks, because these exhibit a better sensitivity at higher energies (cf., figure 3 in ref.…”

Section: Consequences For Realistic Grb Stacking Analysesmentioning

confidence: 99%

“…For instance, better information may be obtained from down-going than upgoing muon tracks, because these exhibit a better sensitivity at higher energies (cf., figure 3 in ref. [71]). As a consequence, the sensitivity may be dominated by a different viewing window and therefore different bursts compared to the "no decay" case, which may have different characteristics.…”

Section: Consequences For Realistic Grb Stacking Analysesmentioning

confidence: 99%

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Neutrino decays over cosmological distances and the implications for neutrino telescopes

Baerwald

Bustamante

Winter

2012

J. Cosmol. Astropart. Phys.

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133

146

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We discuss decays of ultra-relativistic neutrinos over cosmological distances by solving the decay equation in terms of its redshift dependence. We demonstrate that there are significant conceptual differences compared to more simplified treatments of neutrino decay. For instance, the maximum distance the neutrinos have traveled is limited by the Hubble length, which means that the common belief that longer neutrino lifetimes can be probed by longer distances does not apply. As a consequence, the neutrino lifetime limit from supernova 1987A cannot be exceeded by high-energy astrophysical neutrinos. We discuss the implications for neutrino spectra and flavor ratios from gamma-ray bursts as one example of extragalactic sources, using up-to-date neutrino flux predictions. If the observation of SN 1987A implies that ν 1 is stable and the other mass eigenstates decay with rates much smaller than their current bounds, the muon track rate can be substantially suppressed compared to the cascade rate in the region IceCube is most sensitive to. In this scenario, no gamma-ray burst neutrinos may be found using muon tracks even with the full scale experiment, whereas reliable information on high-energy astrophysical sources can only be obtained from cascade measurements. As another consequence, the recently observed two cascade event candidates at PeV energies will not be accompanied by corresponding muon tracks.

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Section: Consequences For Realistic Grb Stacking Analysesmentioning

confidence: 99%

Section: Consequences For Realistic Grb Stacking Analysesmentioning

confidence: 99%

Neutrino decays over cosmological distances and the implications for neutrino telescopes

Baerwald

Bustamante

Winter

2012

J. Cosmol. Astropart. Phys.

Self Cite

133

146

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show abstract

“…In summary, if the average B is large, the synchrotron losses of protons and secondaries may visibly affect the spectral index α ν , flavor composition f α,⊕ , and maximum energy E max ν of the diffuse neutrino flux [66][67][68][69][70]. These features are softened and spread out in energy by the redshift distribution of the sources.…”

Section: Diffuse Flux Of High-energy Neutrinosmentioning

confidence: 99%

Using High-Energy Neutrinos As Cosmic Magnetometers

Bustamante,

Tamborra

2020

Preprint

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Magnetic fields are crucial in shaping the non-thermal emission of the TeV-PeV neutrinos of astrophysical origin seen by the IceCube neutrino telescope. The sources of these neutrinos are unknown, but if they harbor a strong magnetic field, then the synchrotron energy losses of the neutrino parent particles-protons, pions, and muons-leave characteristic imprints on the neutrino energy distribution and its flavor composition. We use high-energy neutrinos as "cosmic magnetometers" to constrain the identity of their sources by placing limits on the strength of the magnetic field in them. We look for evidence of synchrotron losses in public IceCube data: 6 years of High Energy Starting Events (HESE) and 2 years of Medium Energy Starting Events (MESE). In the absence of evidence, we place an upper limit of 10 kG-10 MG (95% C.L.) on the average magnetic field strength of the sources.

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“…Ref. [47]. In addition, the spectral shape, the relative number of each neutrino flavor produced, and the relative number of neutrinos and anti-neutrinos produced depend on the process in which they are produced (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Earlier works in this direction, such as Refs. [47,51,57], rely on a somewhat different assumption: there the target-photon spectrum is generated by synchrotron radiation off co-accelerated electrons -which also reduces the number of parameters, but is probably only a good approximation for specific source classes.…”

Section: Introductionmentioning

confidence: 99%

Unified thermal model for photohadronic neutrino production in astrophysical sources

Fiorillo¹,

Vliet²,

Morisi³

et al. 2021

J. Cosmol. Astropart. Phys.

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High-energy astrophysical neutrino fluxes are, for many applications, modeled as simple power laws as a function of energy. While this is reasonable in the case of neutrino production in hadronuclear pp sources, it typically does not capture the behavior in photohadronic pγ sources: in that case, the neutrino spectrum depends on the properties of the target photons the cosmic rays collide with and on possible magnetic-field effects on the secondary pions and muons. We show that the neutrino production from known photohadronic sources can be reproduced by a thermal (black-body) target-photon spectrum if one suitably adjusts the temperature, thanks to multi-pion production processes. This allows discussing neutrino production from most known pγ sources, such as gamma-ray bursts, active galactic nuclei and tidal disruption events, in terms of a few parameters. We apply this thermal model to study the sensitivity of different classes of neutrino telescopes to photohadronic sources: we classify the model parameter space according to which experiment is most suitable for detection of a specific source class and demonstrate that different experiment classes, such as dense arrays, conventional neutrino telescopes, or radio-detection experiments, cover different parts of the parameter space. Since the model can also reproduce the flavor and neutrino-antineutrino composition, we study the impact on the track-to-shower ratio and the Glashow resonance.

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Interpretation of neutrino flux limits from neutrino telescopes on the Hillas plot

Cited by 9 publications

References 55 publications

Neutrino decays over cosmological distances and the implications for neutrino telescopes

Neutrino decays over cosmological distances and the implications for neutrino telescopes

Using High-Energy Neutrinos As Cosmic Magnetometers

Unified thermal model for photohadronic neutrino production in astrophysical sources

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