A boundary-consistent two-zone kernel shows that distant pulsars beyond 1 kpc can contribute 37-47% of the 10-100 GeV positron flux for a 0.2 kpc disk thickness, with Geminga-like halos compatible with AMS-02 data when including a 100 pc cavity.
Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
6 Pith papers cite this work. Polarity classification is still indexing.
6
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abstract
High energy cosmic ray electrons plus positrons (CREs), which lose energy quickly during their propagation, provide an ideal probe of Galactic high-energy processes and may enable the observation of phenomena such as dark-matter particle annihilation or decay. The CRE spectrum has been directly measured up to $\sim 2$ TeV in previous balloon- or space-borne experiments, and indirectly up to $\sim 5$ TeV by ground-based Cherenkov $\gamma$-ray telescope arrays. Evidence for a spectral break in the TeV energy range has been provided by indirect measurements of H.E.S.S., although the results were qualified by sizeable systematic uncertainties. Here we report a direct measurement of CREs in the energy range $25~{\rm GeV}-4.6~{\rm TeV}$ by the DArk Matter Particle Explorer (DAMPE) with unprecedentedly high energy resolution and low background. The majority of the spectrum can be properly fitted by a smoothly broken power-law model rather than a single power-law model. The direct detection of a spectral break at $E \sim0.9$ TeV confirms the evidence found by H.E.S.S., clarifies the behavior of the CRE spectrum at energies above 1 TeV and sheds light on the physical origin of the sub-TeV CREs.
representative citing papers
Direct measurements reveal charge-dependent spectral softenings in primary cosmic rays at a common rigidity of ~15 TV, rejecting mass-dependent softening at >99.999% confidence.
Electron stability observations rule out the subluminal LIV parameters previously used to explain high-energy neutrino time delays.
The Guitar Nebula requires extreme acceleration with η_acc ≳ 3/4 and traverses a dense low-ionization shell from an old supernova remnant in the pressure-driven snowplow regime.
Numerical modeling with GALPROP predicts CTAO detectability of gamma rays from SNR G296.5+10.0 and CCO 1E 1207.4-5209 at 5 sigma after 50 hours, with hadronic processes dominating at lower energies and leptonic at higher.
A review summarizing current observational, experimental, and theoretical results on dark matter.
citing papers explorer
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A Boundary-Consistent Two-Zone Electron Kernel for Distant Pulsar Contributions to Positron Flux and Anisotropy
A boundary-consistent two-zone kernel shows that distant pulsars beyond 1 kpc can contribute 37-47% of the 10-100 GeV positron flux for a 0.2 kpc disk thickness, with Geminga-like halos compatible with AMS-02 data when including a 100 pc cavity.
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Charge-dependent spectral softenings of primary cosmic-rays below the knee
Direct measurements reveal charge-dependent spectral softenings in primary cosmic rays at a common rigidity of ~15 TV, rejecting mass-dependent softening at >99.999% confidence.
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Electron stability constrains neutrino time delays
Electron stability observations rule out the subluminal LIV parameters previously used to explain high-energy neutrino time delays.
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Guitar Nebula: extreme accelerator in extreme environment
The Guitar Nebula requires extreme acceleration with η_acc ≳ 3/4 and traverses a dense low-ionization shell from an old supernova remnant in the pressure-driven snowplow regime.
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Probing Low-Luminosity Gamma-Ray Emission from SNR G296.5+10.0 and CCO 1E 1207.4-5209 with CTAO
Numerical modeling with GALPROP predicts CTAO detectability of gamma rays from SNR G296.5+10.0 and CCO 1E 1207.4-5209 at 5 sigma after 50 hours, with hadronic processes dominating at lower energies and leptonic at higher.
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Dark Matter
A review summarizing current observational, experimental, and theoretical results on dark matter.