Table 1.
Summary of the main characteristics of the different components that are present in our multi-component model.
| Name | Production mechanism | Normalization | α | Angular | Energy range | Examples/Comments |
|---|---|---|---|---|---|---|
| Atmospheric | Pion/kaon decay, atm. muons |
|
3.7 | Isotropic | ≲ 0.2–0.5 PeV | |
| Charmed meson decays (prompt) | (fixed) | 2.7 | Isotropic | (never) | Norm. from Aartsen et al. (2017e) (upper limit) | |
| Galactic | Ap or pp interactions | Fgal | ~2.6 | Galactic | ≲ PeV | Cosmic ray interactions with gas, point sources |
| Xpp (extragal.) | Ap or pp interactions | FX−pp | ~2 | Isotropic | 0.2–2 PeV | Starburst galaxies, radio galaxies, AGN winds, halo/galaxy mergers |
| Xpγ (extragal.) | Aγ or pγ interactions | FX−pγ | ≪2 | Isotropic | >2 PeV | Tidal Disruption Events (TDEs), AGN blazars, LL-GRBs |
Notes. The column “Normalization” refers to the (free) normalization parameter used in the fit (unless it is fixed), the column “α” to the approximate spectral index of the incident neutrino flux 
, the column “Energy range” to the approximate energy range where the spectrum is found to dominate (which depends on the sky direction and event topology), and the column “Angular” to the assumed rough angular distribution. In the last column, our baseline model for the spectral shape is marked in bold.
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