2018/11/30 by J. Eagle, Jordan Eagle, S. Marchesi +9 · 1 citation
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #Near-Earth supernova #Spectral index #Spectral line #Supernova #Supernova remnant #Telescope #Vela #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/aaf0ff
9 pages, 7 figures, Accepted for publication in ApJ on November 12, 2018. Published Jan. 3, 2019
openalex created_date 2018/11/29 · openalex publication_date 2019/01/01 · arxiv created 2020/10/05 · arxiv updated 2020/10/06 · openalex updated_date 2026/08/05
Abstract We report on the investigation of a very high-energy, Galactic γ -ray source recently discovered at >50 GeV using the Large Area Telescope on board Fermi . This object, 2FHL J0826.1−4500, displays one of the hardest >50 GeV spectra (photon index Γ γ ∼ 1.6) in the 2FHL catalog, and a follow-up observation with XMM - Newton has uncovered diffuse, soft thermal emission at the position of the γ -ray source. A detailed analysis of the available multi-wavelength data shows that this source is located on the western edge of the Vela supernova remnant (SNR): the observations and the modeling of the spectral energy distribution support a scenario where this γ -ray source is the byproduct of the interaction between the SNR shock and a neutral hydrogen cloud. If confirmed, this shock–cloud interaction would make 2FHL J0826.1−4500 a promising candidate for efficient particle acceleration.