Strong magnetic fields and SGRs/AXPs as white dwarf pulsar: a source of ultra-high energy cosmic rays

8th International Workshop on Hadron Physics

Lobato, Ronaldo V.^1 ; Malheiro, M.^1

Departamento de Física, Instituto Tecnólogico de Aeronáutica, ITA - DCTA, Vila das Acácias, São José dos Campos, SP

12228-900, Brazil^1

关键词: Anomalous x-ray pulsars;    Electric potential difference;    Energetic photons;    Lorentz factor;    Soft gamma repeaters;    Strong magnetic fields;    Ultra high-energy cosmic rays;    Ultra-high energies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/706/5/052032/pdf
DOI  :  10.1088/1742-6596/706/5/052032

来源: IOP

【 摘 要 】

The origin of highest energy cosmic rays still remains a mystery in Astrophysics. In this work we consider the Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs) as possible sources of ultra-high cosmic rays. These stars described as white dwarfs pulsars can achieved large electric potential differences in their surface and accelerate particles up to Lorentz factors γ ∼ 1010. Pulsars offer favorable sites for the injection of electrons and heavy nuclei, and accelerate them to ultrahigh energies. Once accelerated in the pulsar this particles can escape from the magnetosphere and produce the radiation observed. Here, we discuss the possibility of SGRs/AXPs as white dwarf pulsars to be possible sources of ultra-high energetic photons with E ∼ 1021eV.