Ultra-high energy cosmic rays from white dwarf pulsars and the Hillas criterion

5th Compact Stars in the QCD Phase Diagram

Lobato, Ronaldo V.^1,3,4 ; Coelho, Jaziel G.^2 ; Malheiro, M.^1

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

12228-900, Brazil^1

Divisão de Astrofísica, Instituto Nacional de Pesquisas Espaciais, DAS/INPE/MCTI, São José dos Campos, São Paulo

12227-010, Brazil^2

Dipartimento di Fisica, Sapienza Università di Roma, P.le Aldo Moro 5, Rome

I-00185, Italy^3

ICRANet, P.zza della Repubblica 10, Pescara

I-65122, Italy^4

关键词: Anomalous x-ray pulsars;    Astroparticle physics;    Electromagnetic potentials;    Soft gamma repeaters;    Ultra high-energy cosmic rays;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/861/1/012005/pdf
DOI  :  10.1088/1742-6596/861/1/012005

来源: IOP

【 摘 要 】

The origins of ultra-high-energy cosmic rays (E1019eV) are a mystery and still under debate in astroparticle physics. In recent years some efforts were made to understand their nature. In this contribution we consider the possibility of Some Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs) beeing white dwarf pulsars, and show that these sources can achieve large electromagnetic potentials on their surface that accelerate particle almost at the speed of light, with energies E ∼ 1020-21eV. The sources SGRs/AXPs considered as highly magnetized white dwarfs are well described in the Hillas diagram, lying close to the AR Sorpii and AE Aquarii which are understood as white dwarf pulsars.