LHAASO gamma-ray data from G150.3+4.5 and γ-Cygni show high-energy components produced by PeV cosmic rays from supernova remnants colliding with molecular clouds.
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Fermi LAT data analysis detects a time-evolving ~162-day periodic GeV signal from 4FGL J1913.2+0512 linked to SS 433, prominent in 2008-2018 but diminished afterward, indicating multi-year evolution in gamma-ray production efficiency or geometry.
A two-component Galactic source model with supernova remnants below 100 TeV and microquasars above, using charge-dependent cutoffs, accounts for cosmic-ray spectra, composition, and the all-particle spectrum up to PeV energies while ruling out nuclei-dependent cutoffs.
citing papers explorer
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Ultra-high-energy $\gamma$-ray imprints from PeV particles accelerated by supernova remnants
LHAASO gamma-ray data from G150.3+4.5 and γ-Cygni show high-energy components produced by PeV cosmic rays from supernova remnants colliding with molecular clouds.
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Temporal evolution of the periodic GeV signal from 4FGL J1913.2+0512 and analysis of the SS 433 / W50 lobes
Fermi LAT data analysis detects a time-evolving ~162-day periodic GeV signal from 4FGL J1913.2+0512 linked to SS 433, prominent in 2008-2018 but diminished afterward, indicating multi-year evolution in gamma-ray production efficiency or geometry.
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Two kinds of Galactic source populations could explain the cosmic-ray observation up to the "knee" region
A two-component Galactic source model with supernova remnants below 100 TeV and microquasars above, using charge-dependent cutoffs, accounts for cosmic-ray spectra, composition, and the all-particle spectrum up to PeV energies while ruling out nuclei-dependent cutoffs.