Energetics of High-Energy Cosmic Radiations

Abstract

The luminosity densities of high-energy cosmic radiations are studied to find connections among the various components, including high-energy neutrinos measured with IceCube and gamma rays with the Fermi satellite. Matching the cosmic-ray energy generation rate density in a GeV-TeV range estimated for Milky Way with the ultrahigh-energy component requires a power-law index of the spectrum, $s_{\mathrm{cr}}\approx 2.1-2.2$, somewhat harder than $s_{\mathrm{cr}}\approx 2.3-2.4$ for the local index derived from the AMS-02 experiment. The soft GeV-TeV cosmic-ray spectrum extrapolated to higher energies can be compatible with PeV cosmic rays inferred from neutrino measurements, but overshoots the CR luminosity density to explain GeV-TeV gamma rays. The extrapolation from ultrahigh energies with a hard spectrum, on the other hand, can be consistent with both neutrinos and gamma-rays. These point towards either reacceleration of galactic cosmic rays or the presence of extragalactic sources with a hard spectrum. We discuss possible cosmic-ray sources that can be added.

14 pages, 3 figures, 2 tables, accepted for publication in PRD. Results and conclusions unchanged

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Cited by in corpus (45)

• IceCube-Gen2: The Window to the Extreme Universe
• Hidden Cores of Active Galactic Nuclei as the Origin of Medium-Energy Neutrinos: Critical Tests with the MeV Gamma-Ray Connection
• Open Questions in Cosmic-Ray Research at Ultrahigh Energies
• Detection of a particle shower at the Glashow resonance with IceCube
• Multi-Messenger Astrophysics
• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• Tidally disrupted stars as a possible origin of both cosmic rays and neutrinos at the highest energies
• New constraints on the origin of medium-energy neutrinos observed by IceCube
• High-Energy Neutrinos from Active Galactic Nuclei
• High-Energy Extragalactic Neutrino Astrophysics
• Neutrino Emissions from Tidal Disruption Remnants
• Where are Milky Way's Hadronic PeVatrons?
• PeV photon and neutrino flares from galactic gamma-ray binaries
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• Multimessenger Gamma-Ray and Neutrino Coincidence Alerts using HAWC and IceCube sub-threshold Data
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• Reacceleration of Galactic Cosmic Rays Beyond the Knee at the Termination Shock of a Cosmic-Ray-Driven Galactic Wind
• Near-future discovery of point sources of ultra-high-energy neutrinos
• PeV proton acceleration in Gamma-ray Binaries
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• High-Energy Neutrino Emission from Espresso-Reaccelerated Ions in Jets of Active Galactic Nuclei
• Cosmic rays escaping from Galactic starburst-driven superbubbles
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• The IceCube Pie Chart: Relative Source Contributions to the Cosmic Neutrino Flux
• Multi-messenger Implications of Sub-PeV Diffuse Galactic Gamma-Ray Emission
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• High-Energy Neutrinos from Cosmic-Ray Scatterings with Supernova Neutrinos