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Monte Carlo modeling of multi-PeV protons acceleration in gamma-ray binaries with strong stellar wind magnetic field.

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Title: Monte Carlo modeling of multi-PeV protons acceleration in gamma-ray binaries with strong stellar wind magnetic field.
Authors: Petrov, A.E.1 (AUTHOR) a.e.petrov@mail.ioffe.ru, Bykov, A.M.1 (AUTHOR) byk@astro.ioffe.ru
Source: Advances in Space Research. Apr2026, Vol. 77 Issue 8, p8391-8405. 15p.
Subjects: Stellar winds, Particle acceleration, Binary stars, Monte Carlo method, Gamma rays
Abstract: Recently discovered sources of very high energy gamma-rays (above 100 TeV) must support efficient mechanisms that can accelerate particles to PeV energies. Some of these sources are likely identified with compact binary star systems that harbor a relativistic companion. In such systems, the zone of collision of the relativistic outflow from a neutron star or a black hole with the powerful magnetized wind of the massive star provides conditions for efficient particle acceleration. We present a new Monte Carlo model of particle acceleration in binaries containing a rotation-powered pulsar, based on the results of accurate modeling of the collision winds zone structure. Our model takes into account the anisotropy of particle transport in the strong large-scale magnetic field of the winds. We discuss three phases of particle acceleration: (i) Fermi I type at a single shock of the wind's termination; (ii) Fermi I type in the zone of colliding winds and (iii) particle upscattering by fast relativistic inhomogeneities of (sub-)AU spatial scale moving with high Lorentz-factor Γ > 2 in the shocked pulsar wind. We demonstrate that these systems can efficiently produce multi-PeV protons for pulsar spin-down luminosity below 10 36 erg s - 1 , significantly exceeding the maximum energies associated with the total magnetospheric potential. A sub-Gauss stellar wind magnetic field in the collision zone ≲ 0.5 G and Γ ∼ 3 are necessary to reach energies ∼ 20 PeV that are required to trigger photomeson gamma-ray and neutrino production in such systems. [ABSTRACT FROM AUTHOR]
Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192590058
AccessLevel: 6
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Items – Name: Title
  Label: Title
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  Data: Monte Carlo modeling of multi-PeV protons acceleration in gamma-ray binaries with strong stellar wind magnetic field.
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  Data: <searchLink fieldCode="AR" term="%22Petrov%2C+A%2EE%2E%22">Petrov, A.E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> a.e.petrov@mail.ioffe.ru</i><br /><searchLink fieldCode="AR" term="%22Bykov%2C+A%2EM%2E%22">Bykov, A.M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> byk@astro.ioffe.ru</i>
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  Data: <searchLink fieldCode="JN" term="%22Advances+in+Space+Research%22">Advances in Space Research</searchLink>. Apr2026, Vol. 77 Issue 8, p8391-8405. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Stellar+winds%22">Stellar winds</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+acceleration%22">Particle acceleration</searchLink><br /><searchLink fieldCode="DE" term="%22Binary+stars%22">Binary stars</searchLink><br /><searchLink fieldCode="DE" term="%22Monte+Carlo+method%22">Monte Carlo method</searchLink><br /><searchLink fieldCode="DE" term="%22Gamma+rays%22">Gamma rays</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Recently discovered sources of very high energy gamma-rays (above 100 TeV) must support efficient mechanisms that can accelerate particles to PeV energies. Some of these sources are likely identified with compact binary star systems that harbor a relativistic companion. In such systems, the zone of collision of the relativistic outflow from a neutron star or a black hole with the powerful magnetized wind of the massive star provides conditions for efficient particle acceleration. We present a new Monte Carlo model of particle acceleration in binaries containing a rotation-powered pulsar, based on the results of accurate modeling of the collision winds zone structure. Our model takes into account the anisotropy of particle transport in the strong large-scale magnetic field of the winds. We discuss three phases of particle acceleration: (i) Fermi I type at a single shock of the wind's termination; (ii) Fermi I type in the zone of colliding winds and (iii) particle upscattering by fast relativistic inhomogeneities of (sub-)AU spatial scale moving with high Lorentz-factor Γ > 2 in the shocked pulsar wind. We demonstrate that these systems can efficiently produce multi-PeV protons for pulsar spin-down luminosity below 10 36 erg s - 1 , significantly exceeding the maximum energies associated with the total magnetospheric potential. A sub-Gauss stellar wind magnetic field in the collision zone ≲ 0.5 G and Γ ∼ 3 are necessary to reach energies ∼ 20 PeV that are required to trigger photomeson gamma-ray and neutrino production in such systems. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=192590058
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      – Type: doi
        Value: 10.1016/j.asr.2026.01.103
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      – Code: eng
        Text: English
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        PageCount: 15
        StartPage: 8391
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      – SubjectFull: Stellar winds
        Type: general
      – SubjectFull: Particle acceleration
        Type: general
      – SubjectFull: Binary stars
        Type: general
      – SubjectFull: Monte Carlo method
        Type: general
      – SubjectFull: Gamma rays
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              Text: Apr2026
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              Y: 2026
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