High-energy neutrinos from Galactic superbubbles

Abstract

We study the propagation of cosmic rays generated by sources residing inside superbubbles. We show that the enhanced magnetic field in the bubble wall leads to an increase of the interior cosmic ray density. Because of the large matter density in the wall, the probability for cosmic ray interactions on gas peaks there. As a result, the walls of superbubbles located near young cosmic ray sources emit efficiently neutrinos. We apply this scenario to the Loop~I and Local Superbubble: These bubbles are sufficiently near such that cosmic rays from a young source as Vela interacting in the bubble wall can generate a substantial fraction of the observed astrophysical high-energy neutrino flux below $\sim$ few $\times 100$ TeV.

5 pages, 3 eps figures; v2: explanations and 2 figures added, to appear in ApJL

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• Observation and Characterization of a Cosmic Muon Neutrino Flux from the Northern Hemisphere using six years of IceCube data
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Cited by in corpus (15)

• Cosmic Ray Models
• Astrophysics Uniquely Enabled by Observations of High-Energy Cosmic Neutrinos
• Galactic contribution to the high-energy neutrino flux found in track-like IceCube events
• Multi-messenger-Athena Synergy White Paper
• Vela as the Source of Galactic Cosmic Rays above 100 TeV
• Galactic diffuse gamma-ray emission at TeV energy
• LHAASO sensitivity for diffuse gamma-ray signals from the Galaxy
• High-energy neutrinos from cosmic ray interactions in the Local Bubble
• The coherent magnetic field of the Milky Way halo, Local Bubble and Fan Region
• The origin of high-energy astrophysical neutrinos: new results and prospects
• Carpet-2 search for PeV gamma rays associated with IceCube high-energy neutrino events
• Can the Local Bubble explain the radio background?
• Probing the Galactic neutrino flux at neutrino energies above 200 TeV with the Baikal Gigaton Volume Detector
• Mapping large-scale diffuse gamma-ray emission in 10-100 TeV band with Cherenkov telescopes
• Hot spots in the neutrino flux created by cosmic rays from Cygnus and Vela?