2004/01/09 by Peter L. Biermann, Gustavo Medina-Tanco, Gustavo Medina Tanco +2 · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmic ray #Earth Systems and Cosmic Evolution #Flux (metallurgy) #Galactic Center #Galaxy #Gamma ray #Gamma-ray burst #Gamma-ray bursts and supernovae #Interstellar medium #Neutron #Neutron star #Ultra-high-energy cosmic ray #astro-ph
paper · pdf · doi:10.1086/382072
published as Astrophys.J. 604 (2004) L29-L32 · Accepted for publication in Ap. J. Letters
arxiv created 2004/01/09 · openalex publication_date 2004/02/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Here we propose that the excess flux of particle events of energy near 10 18 eV from the direction of the Galactic center region is due to the production of cosmic rays by the last few gamma-ray bursts in our Galaxy. The basic idea is that protons get accelerated inside gamma-ray bursts, then get ejected as neutrons, decay and so turn back into protons, meander around the inner Galaxy for some time, and then interact again, turning back to neutrons to be observed at our distance from the Galactic center region, where most star formation is happening in our Galaxy. We demonstrate that this suggestion leads to a successful interpretation of the data, within the uncertainties of cosmic-ray transport timescales in the inner Galaxy, and in conjunction with many arguments in the literature.