Blazar origin of some IceCube events

Multi-messenger astronomy can help to investigate the sources of the high-energy neutrinos observed by the high-energy neutrino telescope IceCube. We consider the hypothesis that the highest energy neutrinos are produced by BL Lacs, arguing that this is not contradicted severely by any known fact. We check the BL Lac hypothesis by searching for correlations between the throughgoing muon events of IceCube and the BL Lacs of the second catalog of Fermi-LAT (2FHL). We expect 10.2 ± 2.4 correlated events but we find that just 1 event has a BL Lac as counterpart. We also assess the probability of observing one multiplet from the same source, finding that the present null result is not yet of critical significance. We conclude that the hypothesis that the BL Lacs are the main emitters of the highest-energy neutrinos observed by IceCube is disfavored at 3.7σ. We discuss implications and possible ways out; for example, this could work if the angular resolution was 4 • , which is much more than expected.

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“…Using Eq. (13) we find that the number of signal events, expected to show a correlation due to their common origin, is equal to…”

Section: Multipletsmentioning

confidence: 85%

“…Blazars are widely considered to be promising candidates for high-energy neutrino emission ( [1,[4][5][6][7][8][9][10][11][12][13][14][15]). Moreover, certain analyses of IceCube data (we refer to [12] for a very recent and comprehensive work) suggest that a fraction of the events seen by IceCube could be attributed to blazars.…”

Section: Introductionmentioning

confidence: 99%

Can BL Lacertae emission explain the neutrinos above 0.2 PeV?

Palladino

Vissani

2017

A&A

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“…It can be inferred from (20) that the further the source, the broader will be the absorption line. We have assumed that the UHE neutrinos originate from blazars and non-blazar AGNs as opposed to spatially distributed sources like Dark Matter decay [37][38][39][40][41]. Future multi messenger observations will help us verify this hypothesis.…”

Section: Neutrino Absorption By Cosmic Neutrino Backgroundmentioning

confidence: 99%

Signature of light sterile neutrinos at IceCube

Chauhan

Mohanty

2018

Phys. Rev. D

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The MiniBooNE collaboration has recently reported evidence for a light sterile neutrino with large mixing angles thus corroborating the measurement by LSND twenty years ago. Such a state would be directly in conflict with Planck measurement of BBN N ef f unless there is self-interaction in the sterile sector.Our objective is to investigate if such interactions could result in resonant absorption in the cosmogenic neutrino spectrum and its consequences for the IceCube experiment. We show that it is possible to give independent bounds on sterile neutrino parameter space from IceCube observations with the dips in the spectrum corresponding to the neutrino masses. * bhavesh@prl.res.in † mohanty@prl.res.in arXiv:1808.04774v2 [hep-ph]

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“…Due to the large error boxes, the origin of high-energy neutrinos detected by IceCube remain unknown. The proposed neutrino sources include blazars [21][22][23][24][25][26][27], gamma-ray bursts (GRBs) [28][29][30][31][32][33][34][35][36][37][38], hypernovae [39][40][41], intergalactic shocks [42][43][44], and starburst galaxies [45,46], etc. A stringent constraint on the associations of IceCube neutrinos with GRBs has been placed [47,48], which posed interesting constraints on GRB models [49,50].…”

Section: Constraints On Neutrino-emission Mechanism and Envi-ronments...mentioning

confidence: 99%

“…A stringent constraint on the associations of IceCube neutrinos with GRBs has been placed [47,48], which posed interesting constraints on GRB models [49,50]. Possible associations of high-energy neutrinos with blazars have been suggested [21][22][23][24][25][26][27]51], but the case is not conclusive. Furthermore, it is unknown whether the pγ or the pp interactions are the dominant channel to produce these high-energy neutrinos.…”

Section: Constraints On Neutrino-emission Mechanism and Envi-ronments...mentioning

confidence: 99%

On the non-detection of Glashow resonance in IceCube

Sahu

Zhang

2018

Journal of High Energy Astrophysics

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Electron anti-neutrinos at the Glashow resonance (GR, at Eν e ∼ 6.3 PeV) have an enhanced probability to be detected. With three neutrinos detected by IceCube in the (1-2) PeV energy range at present, one would expect that about 1 to 4 GRν e should have been detected. The high-energy ∼ 8.7 PeV muon neutrino detected by IceCube may not be a GR event. If so, we expect to detect 50 to 70 GRν e , then one would have a "missing Glashow-resonance problem". This would suggest(1) that pγ interaction rather than pp interaction is the dominant channel to produce the observed IceCube high-energy neutrinos; (2) that multi-pion pγ interactions are suppressed; and (3) that the magnetic field and photon energy density in the pγ emission region is such that significant µ + cooling occurs before decaying, yet π + 's essentially do not cool before decaying.

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Blazar origin of some IceCube events

Cited by 4 publications

References 29 publications

Can BL Lacertae emission explain the neutrinos above 0.2 PeV?

Can BL Lacertae emission explain the neutrinos above 0.2 PeV?

Signature of light sterile neutrinos at IceCube

On the non-detection of Glashow resonance in IceCube

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