Microquasar jet-cocoon systems as PeVatrons
arXiv:2506.20193 · doi:10.1103/p6r1-qg5q
Abstract
The origin of Galactic cosmic rays (CRs), particularly around the knee region (3 PeV), remains a major unsolved question. Recent observations by LHAAASO suggest that the knee is shaped mainly by protons, with a transition to heavier elements at higher energies. Microquasars -- compact jet-emitting sources -- have emerged as possible PeV CR accelerators, especially after detections of ultrahigh-energy gamma rays from these systems. We propose that the observed proton spectrum (hard below a few PeV, steep beyond) arises from the reacceleration of sub-TeV Galactic CRs via shear acceleration in large-scale microquasar jet-cocoon structures. Our model also naturally explains the observed spectrum of energies around a few tens of PeV by summing up heavier nuclei contributions. Additionally, similar reacceleration processes in radio galaxies can contribute to ultrahigh-energy CRs, bridging Galactic and extragalactic origins. Combined with low-energy CRs from supernova remnants and galaxy clusters around the second knee region, this scenario could provide a unified explanation for CRs across the entire energy spectrum.
11 pages, 8 figures, accepted for publication in PRD
References in corpus (67)
- Modelling the behaviour of accretion flows in X-ray binaries
- The Interstellar Environment of our Galaxy
- First Observation of the Greisen-Zatsepin-Kuzmin Suppression
- Observation of the suppression of the flux of cosmic rays above 4x10^19eV
- KASCADE measurements of energy spectra for elemental groups of cosmic rays: Results and open problems
- The Origin of Galactic Cosmic Rays
- The Astrophysics of Ultrahigh Energy Cosmic Rays
- BlackCAT: A catalogue of stellar-mass black holes in X-ray transients
- Testing the Hadronuclear Origin of PeV Neutrinos Observed with IceCube
- WATCHDOG: A Comprehensive All-Sky Database of Galactic Black Hole X-ray Binaries
- KASCADE-Grande measurements of energy spectra for elemental groups of cosmic rays
- On the spectrum of high-energy cosmic rays produced by supernova remnants in the presence of strong cosmic-ray streaming instability and wave dissipation
- The all-particle spectrum of primary cosmic rays in the wide energy range from 10^14 eV to 10^17 eV observed with the Tibet-III air-shower array
- Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients
- The origin of Galactic cosmic rays: challenges to the standard paradigm
- Limits on diffusive shock acceleration in supernova remnants in the presence of cosmic-ray streaming instability and wave dissipation
- Cosmic Ray Spectrum and Composition from PeV to EeV Using 3 Years of Data From IceTop and IceCube
- Very high energy particle acceleration powered by the jets of the microquasar SS 433
- GRS 1915+105: The brightest Galactic black hole
- Linking High-Energy Cosmic Particles by Black-Hole Jets Embedded in Large-Scale Structures
- Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory
- Shear acceleration in relativistic astrophysical jets
- Cosmic Rays Above the Second Knee from Clusters of Galaxies and Associated High-Energy Neutrino Emission
- The Cosmic-Ray Energy Spectrum between 2 PeV and 2 EeV Observed with the TALE detector in monocular mode
- Cosmic-ray energy spectrum and composition up to the ankle - the case for a second Galactic component
- Propagation of ultrahigh energy nuclei in clusters of galaxies: resulting composition and secondary emissions
- All-particle cosmic ray energy spectrum measured by the HAWC experiment from 10 to 500 TeV
- On the cosmic ray spectrum from type II Supernovae expanding in their red giant presupernova wind
- Probing Cosmic-Ray Ion Acceleration with Radio-Submm and Gamma-Ray Emission from Interaction-Powered Supernovae
- High-energy particles and radiation in star-forming regions
- The knee in galactic cosmic ray spectrum and variety in supernovae
- "Espresso" Acceleration of Ultra-high-energy Cosmic Rays
- Energetics of High-Energy Cosmic Radiations
- Ultrahigh-energy Cosmic-ray Nuclei from Black Hole Jets: Recycling Galactic Cosmic Rays through Shear Acceleration
- An Introduction to Particle Acceleration in Shearing Flows
- Chemical Enhancements in Shock-accelerated Particles: Ab-initio Simulations
- Cosmic Ray Models
- Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433
- Escape model for Galactic cosmic rays and an early extragalactic transition
- Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A
- Ultra-High-Energy Gamma-Ray Bubble around Microquasar V4641 Sgr
- Contribution of nuclei accelerated by gamma-ray pulsars to cosmic rays in the Galaxy
- High-energy Cosmic Ray production in X-ray Binary Jets
- GW150914-like Black Holes as Galactic High-Energy Sources
- Pulsar Wind Nebulae inside Supernova Remnants as Cosmic-Ray PeVatrons
- Bottom-up Acceleration of Ultra-High-Energy Cosmic Rays in the Jets of Active Galactic Nuclei
- Mapping Jet-ISM Interactions in X-ray Binaries with ALMA: A GRS 1915105 Case Study
- Cosmic rays from Galactic pulsars
- Deciphering the Origin of the GeV--TeV Gamma-ray Emission from SS 433
- The Physical Parameters of the Micro-quasar S26 in the Sculptor Group Galaxy NGC 7793
- Direct Numerical Simulations of Cosmic-ray Acceleration at Dense Circumstellar Medium: Magnetic Field Amplification by Bell Instability and Maximum Energy
- Magnetically Arrested Disks in Quiescent Black-Hole Binaries: Formation Scenario, Observable Signatures, and Potential PeVatrons
- Multi-wavelength Emission from Galactic Jets: the Case of the Microquasar SS433
- Aligned Molecular Clouds towards SS433 and L=348.5 degrees; Possible Evidence for Galactic "Vapor Trail" Created by Relativistic Jet
- Super-Knee Cosmic Rays from Galactic Neutron Star Merger Remnants
- ALMA/NICER observations of GRS 1915+105 indicate a return to a hard state
- Continuous Jets and Backflow Models for the Formation of W50/SS433 in Magnetohydrodynamics Simulations
- Particle acceleration in radio galaxies with flickering jets: GeV electrons to ultrahigh energy cosmic rays
- Precise measurements of the cosmic ray proton energy spectrum in the "knee'' region
- Reacceleration of Galactic Cosmic Rays Beyond the Knee at the Termination Shock of a Cosmic-Ray-Driven Galactic Wind
- Magnetic diffusion and interaction effects on Ultrahigh Energy Cosmic Rays: protons and nuclei
- Astroparticles from X-ray Binary Coronae
- Spectral study of very high energy gamma rays from SS 433 with HAWC
- Molecular clouds at the eastern edge of radio nebula W50
- Ultrahigh-energy neutrinos as a probe of espresso-shear acceleration in jets of Centaurus A
- High-Energy Neutrino Emission from Espresso-Reaccelerated Ions in Jets of Active Galactic Nuclei
- Investigating the CREDIT history of supernova remnants as cosmic-ray sources