2021/04/15 by Bing Zhao, Wei Liu, Qiang Yuan +7 · 1 citation
Physics and Astronomy · #Amplitude #Anisotropy #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Computational physics #Cosmic ray #Dark Matter and Cosmic Phenomena #Optics #Parameter space #Particle physics theoretical and experimental studies #Physics #Spectral line #Statistics #astro-ph.HE
paper · pdf · open access · doi:10.3847/1538-4357/ac4416
published in The Astrophysical Journal 926(1), 41 (IOP Publishing) · 9 pages, 9 figures, 2 tables
arxiv created 2021/04/15 · openalex publication_date 2022/02/01 · arxiv updated 2022/02/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract The precise measurements of energy spectra and anisotropy could help us uncover the local cosmic-ray accelerators. Our recent works have shown that spectral hardening above 200 GeV in the energy spectra and transition of large-scale anisotropy at ∼100 TeV are of local source origin. Less than 100 TeV, both spectral hardening and anisotropy explicitly indicate the dominant contribution from nearby sources. In this work, we further investigate the parameter space of sources allowed by the observational energy spectra and anisotropy amplitude. To obtain the best-fit source parameters, a numerical package to compute the parameter posterior distributions based on Bayesian inference, which is applied to perform an elaborate scan of parameter space. We find that by combining the energy spectra and anisotropy data, the permissible range of location and age of the local source is considerably reduced. When comparing with the current local supernova remnant (SNR) catalog, only Geminga SNR could be the proper candidate of the local cosmic-ray source.