Electron bremsstrahlung from hot plasma in the presence of strong magnetic field

El-Gowhari, A.; Arpponen, J.

doi:10.1007/bf02738554

Cited by 6 publications

(3 citation statements)

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“…The X-ray Ðeld of a rotationpowered neutron star within the light cylinder can be attributed to the following three emission processes : (1) photospheric emission from the whole surface of a cooling neutron star (Greenstein & Hartke 1983 ;Romani 1987 ;Shibanov et al 1992 ;Pavlov et al 1994 ;Zavlin et al 1995a), (2) thermal emission from the neutron starÏs polar caps, which are heated by the bombardment of relativistic particles streaming back to the surface from the magnetosphere (Kundt & Schaaf 1993 ;Zavlin, Shibanov, & Pavlov 1995b ;Gil & Krawczyk 1997), and (3) nonthermal emission from relativistic particles accelerated in the pulsar magnetosphere (Ochelkov & Usov 1980a, 1980bEl-Gowhari & Arponen 1972 ;Aschenbach & Brinkmann 1975 ;Hardee & Rose 1974 ;Daishido 1975).…”

Section: X-ray Fieldmentioning

confidence: 99%

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Gamma‐Ray Emissions from Pulsars: Spectra of the TeV Fluxes from Outer Gap Accelerators

Hirotani

2001

ApJ

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We study the c-ray emissions from an outer magnetospheric potential gap around a rotating neutron star. Migratory electrons and positrons are accelerated by the electric Ðeld in the gap to radiate copious c-rays via a curvature process. Some of these c-rays materialize as pairs by colliding with the X-rays in the gap, leading to a pair production cascade. Imposing the closure condition that a single pair produces one pair in the gap on average, we explicitly solve the strength of the acceleration Ðeld and demonstrate how the peak energy and the luminosity of the curvature-radiated, GeV photons depend on the strength of the surface blackbody and the power-law emissions. Some predictions on the GeV emission from 12 rotation-powered pulsars are presented. We further demonstrate that the expected pulsed TeV Ñuxes are consistent with their observational upper limits. An implication of high-energy pulse phase width versus pulsar age, spin, and magnetic moment is discussed.

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Section: X-ray Fieldmentioning

confidence: 99%

“…(3) Non-thermal emission from relativistic particles accelerated in the pulsar magnetosphere (Ochelkov & Usov 1980a,b;El-Gowhari & Arponen 1972;Aschenbach & Brinkmann 1974;Hardee & Rose 1974;Daishido 1975).…”

Section: X-ray Fieldmentioning

confidence: 99%

Gamma‐Ray Emissions from Pulsars: Spectra of the TeV Fluxes from Outer Gap Accelerators

Hirotani

2001

ApJ

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“…(3) Non‐thermal emission from relativistic particles accelerated in the pulsar magnetosphere (Ochelkov & Usov 1980a,b; El‐Gowhari & Arponen 1972; Aschenbach & Brinkmann 1975; Hardee & Rose 1974; Daishido 1975).…”

Section: Introductionmentioning

confidence: 99%

One-dimensional electric field structure of an outer gap accelerator -- III. Location of the gap and the gamma-ray spectrum

Hirotani

Shibata

2001

Monthly Notices of the Royal Astronomical Society

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A B S T R A C TWe investigate a stationary particle acceleration zone in the outer magnetosphere of an obliquely rotating neutron star. The charge depletion as a result of global current causes a large electric field along the magnetic field lines. Migratory electrons and/or positrons are accelerated by this field to radiate curvature gamma-rays, some of which collide with the X-rays to materialize as pairs in the gap. As a result of this pair-production cascade, the replenished charges partially screen the electric field, which is self-consistently solved together with the distribution of particles and gamma-rays. If no current is injected at either of the boundaries of the accelerator, the gap is located around the so-called null surface, where the local Goldreich -Julian charge density vanishes. However, we find that the gap position shifts outwards (or inwards) when particles are injected at the inner (or outer) boundary. We apply the theory to the seven pulsars whose X-ray fields are known from observations. We show that the gap should be located near to or outside of the null surface for the Vela pulsar and PSR B1951132, so that their expected GeV spectrum may be consistent with observations. We then demonstrate that the intrinsically large TeV flux from the outer gap of PSR B0540-69 is absorbed by the magnetospheric infrared photons, causing it to be undetectable. We also point out that the electrodynamic structure and the resultant GeV emission properties of millisecond pulsars are similar to young pulsars.

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Bremsstrahlung in a plasma in a quantizing magnetic field

Sazonov¹,

Tuganov²

1975

Radiophys Quantum Electron

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Electron bremsstrahlung from hot plasma in the presence of strong magnetic field

Cited by 6 publications

References 0 publications

Gamma‐Ray Emissions from Pulsars: Spectra of the TeV Fluxes from Outer Gap Accelerators

Gamma‐Ray Emissions from Pulsars: Spectra of the TeV Fluxes from Outer Gap Accelerators

One-dimensional electric field structure of an outer gap accelerator -- III. Location of the gap and the gamma-ray spectrum

Bremsstrahlung in a plasma in a quantizing magnetic field

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