The Baikal-GVD neutrino telescope: search for high-energy cascades

Allakhverdyan, V. A.; Avrorin, A. D.; Avrorin, A. V.; Aynutdinov, V. M.; Bannasch, R.; Bardačová, Z.; Belolaptikov, I. A.; Borina, I. V.; Brudanin, V. B.; Budnev, N. M.; 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.; Fialkovski, S. V.; Gafarov, A. R.; Golubkov, K. V.; Gorshkov, N. S.; Gress, T. I.; Katulin, M. S.; Kebkal, K. G.; Kebkal, O. G.; Khramov, E. V.; Kolbin, M. M.; Konischev, K. V.; Kopański, K. A.; Коробченко, А. В.; Koshechkin, A. P.; Kozhin, V. A.; Kruglov, M. V.; Kryukov, M. K.; Kulepov, V. F.; Malecki, Pa.; Malyshkin, Y. M.; Milenin, M. B.; Mirgazov, R. R.; Naumov, D. V.; Nazari, V.; Noga, W.; Petukhov, D. P.; Pliskovsky, E. N.; Rozanov, M. I.; Rushay, V. D.; Ryabov, E. V.; Safronov, G. B.; Shaybonov, B. A.; Shelepov, M. D.; Šimkovic, F.; Sirenko, A. E.; Скурихин, А. В.; Solovjev, A. G.; N., Sorokovikov, M.; Štekl, I.; Stromakov, A. P.; Sushenok, E. O.; Suvorova, O. V.; Таболенко, В. А.; Tarashansky, B.; Yablokova, Y. V.; Yakovlev, S. A.; Zaborov, D. N.

doi:10.48550/arxiv.2108.01894

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“…Near-term observations by IceCube (Mancina & Silva 2021) may measure the neutrino spectrum at 1-10 TeV. Future observations by IceCube-Gen2 (Aartsen et al 2021), KM3NeT (Adrián-Martínez et al 2016, and Baikal-GVD (Allakhverdyan et al 2021) may extend to the sub-TeV regime and unveil the nature of the neutrino sources. These observations will place fundamental limits on the nature of cosmic sources of high energy neutrinos.…”

Section: Conclusion and Discussionmentioning

confidence: 95%

The TeV Diffuse Cosmic Neutrino Spectrum and the Nature of Astrophysical Neutrino Sources

Fang,

Gallagher,

Halzen

2022

Preprint

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The diffuse flux of cosmic neutrinos has been measured by the IceCube Observatory from TeV to PeV energies. We show that an improved characterization of this flux at the lower energies, TeV and sub-TeV, reveals important information on the nature of the astrophysical neutrino sources in a modelindependent way. Most significantly, it could confirm the present indications that neutrinos originate in cosmic environments that are optically thick to GeV-TeV γ-rays. This conclusion will become inevitable if an uninterrupted or even steeper neutrino power law is observed in the TeV region. In such γ-ray-obscured sources, the γ-rays that inevitably accompany cosmic neutrinos will cascade down to MeV-GeV energies. The requirement that the cascaded γ-ray flux accompanying cosmic neutrinos should not exceed the observed diffuse γ-ray background, puts constraints on the peak energy and density of the radiation fields in the sources. Our calculations inspired by the existing data suggest that a fraction of the observed diffuse MeV-GeV γ-ray background may be contributed by neutrino sources with intense radiation fields that obscure the high-energy γ-ray emission accompanying the neutrinos.

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Section: Conclusion and Discussionmentioning

confidence: 95%