2019/11/18 by Houdun Zeng, Zeng, Houdun, Y. Xin +5 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph)
paper · pdf · doi:10.48550/arxiv.1911.08321
openalex publication_date 2019/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The spectra fits to a sample of 34 supernova remnants (Zeng et al., 2019) are updated. γ-ray spectra of 20 supernova remnants (SNRs) with a soft TeV spectrum are further analyzed. We found that 17 of them can be fitted in the hadronic scenario with a single power-law ion distribution with an index of ∼ 2.6, which is significantly softer than the ion distribution inferred from γ-ray observations of star-burst galaxies. If Galactic cosmic rays are mostly produced by SNRs, this result suggests that SNRs in star-burst galaxies may never reach the phase with a soft γ-ray spectra or escape of high-energy particles from SNRs before they reach this phase with a soft γ-ray spectrum dominates the contribution of SNRs to Galactic cosmic rays.