{
  "id": "2403.03752",
  "version": "v1",
  "published": "2024-03-06T14:39:15.000Z",
  "updated": "2024-03-06T14:39:15.000Z",
  "title": "Two 100 TeV neutrinos coincident with the Seyfert galaxy NGC 7469",
  "authors": [
    "Giacomo Sommani",
    "Anna Franckowiak",
    "Massimiliano Lincetto",
    "Ralf-Jürgen Dettmar"
  ],
  "comment": "9 pages, 6 figures, submitted to Astronomy & Astrophysics",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "In 2013, the IceCube collaboration announced the detection of a diffuse high-energy astrophysical neutrino flux. The origin of this flux is still largely unknown. The most significant individual source is the close-by Seyfert galaxy NGC 1068 at 4.2-sigma level with a soft spectral index. To identify sources based on their counterpart, IceCube releases realtime alerts corresponding to neutrinos with a high probability of astrophysical origin. We report here the spatial coincidence of two neutrino alerts, IC220424A and IC230416A, with the Seyfert galaxy NGC 7469 at a distance of 70 Mpc. We evaluate, a-posteriori, the chance probability of such a coincidence and discuss this source as a neutrino emitter based on its multi-wavelength properties and in comparison to NGC 1068. To calculate the chance coincidence considering neutrino emission from a specific source population, we perform a Goodness-of-Fit test with a test statistic derived from a likelihood ratio that includes the neutrino angular uncertainty and the source distance. We apply this test first to a catalog of AGN sources and second to a catalog of Seyfert galaxies only. Our a-posteriori evaluation excludes the chance coincidence of the two neutrinos with the Seyfert galaxy NGC 7469 at 3.3-sigma level. To be compatible with non-detections of TeV neutrinos, the source would need to have a hard spectral index.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-03-06T14:39:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "seyfert galaxy ngc",
      "tev neutrinos coincident",
      "chance coincidence considering neutrino emission",
      "diffuse high-energy astrophysical neutrino flux",
      "spectral index"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}