Baikal-GVD Astrophysical Neutrino Candidate near the Blazar TXS~0506+056

Collaboration
Aug 25, 2023
9 pages
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Abstract: (arXiv)
We report on the observation of a rare neutrino event detected by Baikal-GVD in April 2021. The event GVD210418CA is the highest-energy cascade observed by Baikal-GVD so far from the direction below the horizon. The estimated cascade energy is 224±75224\pm75~TeV. The evaluated signalness parameter of GVD210418CA is 97.1% using an assumption of the E2.46^{-2.46} spectrum of astrophysical neutrinos. The arrival direction of GVD210418CA is near the position of the well-known radio blazar TXS~0506+056, with the angular distance being within a 90% directional uncertainty region of the Baikal-GVD measurement. The event was followed by a radio flare observed by the RATAN-600 radio telescope, further strengthening the case for the neutrino-blazar association.
Note:
  • 9 pages, 6 figures, Contribution to the 38th International Cosmic Rays Conference (ICRC2023). arXiv admin note: text overlap with arXiv:2210.01650
  • energy: cascade
  • blazar
  • horizon
  • AGN
  • neutrino: VHE
  • neutrino: UHE
  • neutrino: energy spectrum
  • angular distribution
  • TeV