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Galactic Super-Accreting X-ray Binaries as Super-PeVatron Accelerators
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Galactic Super-Accreting X-ray Binaries as Super-PeVatron Accelerators
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The extension of the cosmic-ray (CR) spectrum well beyond 1~PeV necessitates the existence of a population of accelerators in the Milky Way, which we refer to as Super PeVatrons. Identifying the nature of these sources remains a challenge to the paradigm of galactic CRs. Galactic super-accreting X-ray binaries, where the compact object accretes at a rate near or above the Eddington limit, can meet the energy requirement to supply the high-energy population of galactic CRs. We demonstrate that the trans-relativistic jets and/or winds of these powerful objects with kinetic energy luminosity exceeding $10^{39} \, \rm erg/s$, can accelerate protons to energies above several PeV. Detection of such super-accreting X-ray binaries through their ultra-high-energy $\gamma$-ray ``halos" and large-scale nebulae is also discussed.
Forward citations
Cited by 2 Pith papers
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Cygnus X-3: A variable petaelectronvolt gamma-ray source
Cygnus X-3 produces variable gamma rays up to 3.7 PeV, consistent with photomeson production in its relativistic jet requiring protons accelerated to tens of PeV.
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Superdiffusion of cosmic rays in the vicinity of their accelerators and the resulting $\gamma$-ray emission
Superdiffusion produces constant or r^{α-3} CR radial profiles near sources; the associated γ-ray morphology can distinguish it from normal diffusion with IACTs.
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