Investigating the correlations between IceCube high-energy neutrinos and Fermi-LAT $γ$-ray observations. II
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arXiv
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| Format: | Preprint |
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2024
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| author | Lu, Ming-Xuan Liang, Yun-Feng Ouyang, Xuerui Li, Rong-Lan Wang, Xiang-Gao |
| author_facet | Lu, Ming-Xuan Liang, Yun-Feng Ouyang, Xuerui Li, Rong-Lan Wang, Xiang-Gao |
| contents | Given that gamma rays with energies larger than TeV are severely absorbed by background radiation fields, for many extragalactic sources, the GeV-TeV gamma-ray observations are the messengers that are closest in energy to the TeV-PeV neutrinos observed by IceCube. Investigating whether there is a correlation between the gamma-ray and neutrino observations can help us identify high-energy neutrino sources and determine which sources are the main contributors to the all-sky diffuse neutrino flux of IceCube. In previous work, we have already studied the possible gamma-neutrino correlations by analyzing 10 years of IceCube public muon-track data. In this work, we further investigate such correlations by employing the IceCube p-value sky map of the scan for point sources. We examine the spatial associations of hotspots in the neutrino sky map with various gamma-ray source samples: the third Fermi-LAT catalog of high-energy sources (3FHL), LAT 14-year source catalog (4FGL), the fourth catalog of active galactic nuclei (4LAC) and subsets of these samples. Among all the samples, the 3FHL sample shows a possible correlation with the neutrino hotspots with a pre-trial p-value of $9.0\times10^{-5}$ ($\sim 3.9\,σ$), corresponding to a post-trial significance of $\sim1.7\,σ$. However, this is found to be caused by three already known neutrino sources/source candidates: NGC 1068, TXS 0506+056, and PKS 1424+240. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_19730 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Investigating the correlations between IceCube high-energy neutrinos and Fermi-LAT $γ$-ray observations. II Lu, Ming-Xuan Liang, Yun-Feng Ouyang, Xuerui Li, Rong-Lan Wang, Xiang-Gao High Energy Astrophysical Phenomena Given that gamma rays with energies larger than TeV are severely absorbed by background radiation fields, for many extragalactic sources, the GeV-TeV gamma-ray observations are the messengers that are closest in energy to the TeV-PeV neutrinos observed by IceCube. Investigating whether there is a correlation between the gamma-ray and neutrino observations can help us identify high-energy neutrino sources and determine which sources are the main contributors to the all-sky diffuse neutrino flux of IceCube. In previous work, we have already studied the possible gamma-neutrino correlations by analyzing 10 years of IceCube public muon-track data. In this work, we further investigate such correlations by employing the IceCube p-value sky map of the scan for point sources. We examine the spatial associations of hotspots in the neutrino sky map with various gamma-ray source samples: the third Fermi-LAT catalog of high-energy sources (3FHL), LAT 14-year source catalog (4FGL), the fourth catalog of active galactic nuclei (4LAC) and subsets of these samples. Among all the samples, the 3FHL sample shows a possible correlation with the neutrino hotspots with a pre-trial p-value of $9.0\times10^{-5}$ ($\sim 3.9\,σ$), corresponding to a post-trial significance of $\sim1.7\,σ$. However, this is found to be caused by three already known neutrino sources/source candidates: NGC 1068, TXS 0506+056, and PKS 1424+240. |
| title | Investigating the correlations between IceCube high-energy neutrinos and Fermi-LAT $γ$-ray observations. II |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2404.19730 |