Diffuse neutrino flux measurements with the Baikal-GVD neutrino telescope

Allakhverdyan, V. A.; Avrorin, А.D.; Avrorin, A.V.; Aynutdinov, V. M.; Bardаčová, Z.; Белолаптиков, И. А.; Borina, I. V.; Буднев, Н. М.; Dik, V. Y.; Domogatsky, G. V.; Дорошенко, А. А.; Dvornický, R.; Dyachok, A. N.; Dzhilkibaev, Zh.-A.M.; Eckerová, E.; Elzhov, T. V.; Fajt, L.; Гафаров, А. Р.; Golubkov, K.V.; Gorshkov, N.S.; Гресс, Т.; Кебкал, К.Г.; Kebkal, V. K.; Khatun, A.; Khramov, E.; Kolbin, M.M.; Konischev, K. V.; Коробченко, А. В.; Кошечкин, А. П.; Кожин, В. А.; Kruglov, M.V.; Kulepov, V.F.; Malyshkin, Y. M.; Milenin, M.B.; Миргазов, Р. Р.; Naumov, D.; Nazari, V.; Петухов, Д. П.; Pliskovsky, E. N.; Rozanov, M.I.; Rushay, V.D.; Ryabov, Eugene V.; Safronov, G.; Seitova, D.; Shaybonov, B. A.; Shelepov, M.D.; Šimkovic, F.; Sirenko, A.E.; Скурихин, А. В.; Solovjev, A.G.; Сороковиков, М. Н.; Štekl, I.; Stromakov, A. P.; Suvorova, O. V.; Таболенко, В. А.; Yablokova, Y. V.; Zaborov, D.

doi:10.1103/physrevd.107.042005

Cited by 28 publications

(25 citation statements)

References 38 publications

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“…Astrophysical neutrinos of high energies, TeV and above, were discovered almost 10 yr ago by the IceCube Collaboration (Aartsen et al 2014), consistent with later studies with the other two existing instruments, namely, ANTARES (Fusco & Versari 2019) and Baikal-GVD (Allakhverdyan et al 2023). However, their origins are still not fully determined.…”

Section: Introductionsupporting

confidence: 73%

Searches for Neutrinos in the Direction of Radio-bright Blazars with the ANTARES Telescope

Albert,

Alves,

André

et al. 2024

ApJ

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Active galaxies, especially blazars, are among the most promising extragalactic candidates for high-energy neutrino sources. To date, ANTARES searches included these objects and used GeV–TeV γ-ray flux to select blazars. Here, a statistically complete blazar sample selected by their bright radio emission is used as the target for searches of origins of neutrinos collected by the ANTARES neutrino telescope over 13 yr of operation. The hypothesis of a neutrino–blazar directional correlation is tested by pair counting and a complementary likelihood-based approach. The resulting posttrial p-value is 3.0% (2.2σ in the two-sided convention). Additionally, a time-dependent analysis is performed to search for temporal clustering of neutrino candidates as a means of detecting neutrino flares in blazars. None of the investigated sources alone reaches a significant flare detection level. However, the presence of 18 sources with a pretrial significance above 3σ indicates a p = 1.4% (2.5σ in the two-sided convention) detection of a time-variable neutrino flux. An a posteriori investigation reveals an intriguing temporal coincidence of neutrino, radio, and γ-ray flares of the J0242+1101 blazar at a p = 0.5% (2.9σ in the two-sided convention) level. Altogether, the results presented here suggest a possible connection of neutrino candidates detected by the ANTARES telescope with radio-bright blazars.

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Section: Introductionsupporting

confidence: 73%

Searches for Neutrinos in the Direction of Radio-bright Blazars with the ANTARES Telescope

Albert,

Alves,

André

et al. 2024

ApJ

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“…Recently, tremendous progress has been made in observation of high-energy neutrinos, with the existence of their astrophysical flux established by IceCube [1,2], ANTARES [3] and Baikal-GVD [4] experiments. At the same time, both the huge background of atmospheric events and poor angular resolution of neutrino telescopes make it difficult to establish their actual astrophysical sources, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Neutrino production in blazar radio cores

Kalashev,

Kivokurtseva,

Troitsky

2023

J. Cosmol. Astropart. Phys.

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Models of the origin of astrophysical neutrinos with energies from TeVs to PeVs are strongly constrained by multimessenger observations and population studies. Recent results point to statistically significant associations between these neutrinos and active galactic nuclei (AGN) selected by their radio flux observed with very-long-baseline interferometry (VLBI). This suggests that the neutrinos are produced in central parsecs of blazars, AGN with relativistic jets pointing to the observer. However, conventional AGN models tend to explain only the highest-energy part of the neutrino flux observationally associated with blazars. Here we discuss in detail how the neutrinos can be produced in the part of an AGN giving the dominant contribution to the VLBI radio flux, the radio core located close to the jet base. Physical conditions there differ both from the immediate environment of the central black hole and from the plasma blobs moving along the jet. Required neutrino fluxes, considerably smaller than those of photons, can be produced in interactions of relativistic protons, accelerated closer to the black hole, with radiation in the core.

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“…Twenty five high-energy neutrino events as the first astrophysical event candidates have been observed by Baikal-GVD in the period from April 2018 to March 2022, as was recently presented in Ref. [1], [2]. Among them, it was found that the most energetic upward-going cascade-like event (above 200 TeV) arrived from a direction near the radio blazar TXS0506+056 with a probability of the association of 7.4 • 10 −3 [3].…”

Section: Introductionmentioning

confidence: 99%

The Baikal-GVD telescope follow-up analysis of the IceCube neutrino alerts

Dik¹,

V.²,

Allakhverdyan³

et al. 2023

Proceedings of 27th European Cosmic Ray Symposium — PoS(ECRS)

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The Baikal Gigaton Volume Detector is a neutrino telescope of a km 3 scale currently under construction in lake Baikal. Baikal-GVD participates in the international multi-messenger program at earlier stages of its construction. Since autumn 2020 Baikal-GVD follows up of the IceCube neutrino astrotracks. Recent results of fast follow-up searches for time-and-direction correlation of Baikal-GVD high-energy cascades with IceCube GCN messages are presented.

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Diffuse neutrino flux measurements with the Baikal-GVD neutrino telescope

Cited by 28 publications

References 38 publications

Searches for Neutrinos in the Direction of Radio-bright Blazars with the ANTARES Telescope

Searches for Neutrinos in the Direction of Radio-bright Blazars with the ANTARES Telescope

Neutrino production in blazar radio cores

The Baikal-GVD telescope follow-up analysis of the IceCube neutrino alerts

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