Venters, Tonia M.Hamaguchi, KenjiBrandt, Terri J.Ajello, MarcoBlumer, HarshaBriggs, MichaelCoppi, PaoloD'Ammando, FilippoBecker, Michaël DeFields, BrianGuiriec, SylvainHewitt, John W.Humensky, BrianHunter, Stanley D.Li, HuiLien, Amy Y.Longo, FrancescoMarcowith, AlexandreMcEnery, JulieOjha, RoopeshPavlidou, VasilikiPrescod-Weinstein, ChandaSantander, MarcosTomsick, John A.Wadiasingh, ZorawarWalter, Roland2019-03-262019-03-262019-03-11Tonia M. Venters, Kenji Hamaguchi, et.al, Energetic Particles of Cosmic Accelerators I: Galactic Accelerators, Astrophysics , High Energy Astrophysical Phenomena, 2019, https://arxiv.org/abs/1903.04634http://hdl.handle.net/11603/13160The high-energy universe has revealed that energetic particles are ubiquitous in the cosmos and play a vital role in the cultivation of cosmic environments on all scales. Energetic particles in our own galaxy, galactic cosmic rays (GCRs), engage in a complex interplay with the interstellar medium and magnetic fields in the galaxy, giving rise to many of its key characteristics. This White Paper is the first of a two-part series highlighting the most well-known high-energy cosmic accelerators and contributions that MeV gamma-ray astronomy will bring to understanding their energetic particle phenomena. The focus of this white paper is galactic cosmic rays, supernova remnants, protostellar jets and superbubbles, and colliding wind binaries.9en-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.galactic cosmic rays (GCRs)high-energy cosmic acceleratorsMeV gamma-ray astronomyenergetic particlesText