Electrodynamics of the magnetosphere of pulsars

Бескин, В. С.; Gurevich, A. V.; Istomin, Y. N.

doi:10.1070/pu1983v026n11abeh004545

Cited by 48 publications

(95 citation statements)

References 1 publication

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“…Acceleration will then occur in a narrow region very close to the light surface with Δr/r L ∼ 1/M. This seems reminiscent of earlier results about particle acceleration in the presence of small longitudinal currents (Beskin et al 1983;Beskin & Rafikov 2000).…”

Section: Co-rotation Constraintssupporting

confidence: 60%

On particle acceleration and very high energy γ-ray emission in Crab-like pulsars

Osmanov

Rieger

2009

A&A

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Context. The origin of very energetic charged particles and the production of very high-energy (VHE) gamma-ray emission remains still a challenging issue in modern pulsar physics. Aims. By applying a toy model, we explore the acceleration of co-rotating charged particles close to the light surface in a plasma-rich pulsar magnetosphere and study their interactions with magnetic and photon fields under conditions appropriate for Crab-type pulsars. Methods. Centrifugal acceleration of particles in a monopol-like magnetic field geometry is analyzed and the efficiency constraints, imposed by corotation, inverse Compton interactions and curvature radiation reaction are determined. We derive expressions for the maximum particle energy and provide estimates for the corresponding high-energy curvature and inverse Compton power outputs. Results. It is shown that for Crab-like pulsars, electron Lorentz factor up to γ ∼ 10 7 can be achieved, allowing inverse Compton (Klein-Nishina) up-scattering of thermal photons to TeV energies with a maximum luminosity output of ∼10 31 erg/s. Curvature radiation, on the other hand, will result in a strong GeV emission output of up to ∼(10 34 −10 35 ) erg/s, quasi-exponentially decreasing towards higher energies for photon energies below ∼50 GeV. Conclusions. Accordingly to the results presented only young pulsars are expected to be sites of detectable VHE γ-ray emission.

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Section: Co-rotation Constraintssupporting

confidence: 60%

On particle acceleration and very high energy γ-ray emission in Crab-like pulsars

Osmanov

Rieger

2009

A&A

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“…(1) with C ≈ 0.8R √ I 45 [34]. As shown in [28], this result does not contradict to the model [32,33].…”

Section: Magnetic Fieldssupporting

confidence: 69%

“…According to the model by Beskin et al [32,33], the magnetodipole radiation is absent beyond the magnetosphere, while the slowdown of rotation is provided by the current energy losses. However, the the relation between B and PṖ remains similar.…”

Section: Magnetic Fieldsmentioning

confidence: 99%

Atmospheres and radiating surfaces of neutron stars

Potekhin¹

2014

Phys.-Usp.

116

129

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The early 21st century witnesses a dramatic rise in the study of thermal radiation of neutron stars. Modern space telescopes have provided a wealth of valuable information which, when properly interpreted, can elucidate the physics of superdense matter in the interior of these stars. This interpretation is necessarily based on the theory of formation of neutron star thermal spectra, which, in turn, is based on plasma physics and on the understanding of radiative processes in stellar photospheres. In this paper, the current status of the theory is reviewed with particular emphasis on neutron stars with strong magnetic fields. In addition to the conventional deep (semi-infinite) atmospheres, radiative condensed surfaces of neutron stars and "thin" (finite) atmospheres are considered.

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“…Thinner gaps (with sizes h < r g ) can however exist as well and might also be expected in the context of degenerate, force-free outflows (i.e., in ideal MHD). As an example, we mention the null surface (located close to r g ) formed due to the frame-dragging effect (Beskin et al 1992;Hirotani & Okamoto 1998) and the stagnation surface (typically located at a few r g ) which divides MHD inflow from outflow regions (e.g., Globus & Levinson 2014;Broderick & Tchekhovskoy 2015). In these places, continuous charge replenishment (by particle creation or diffusion) has to occur in order to sustain the required Goldreich-Julian charge density ρ GJ = −e n GJ −Ω F B ⊥ /(2πc).…”

Section: Magnetospheric Emissionmentioning

confidence: 99%

Magnetospheric Gamma-Ray Emission in Active Galactic Nuclei

Katsoulakos

Rieger

2018

ApJ

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The rapidly variable, very high-energy (VHE) gamma-ray emission from Active Galactic Nuclei (AGN) has been frequently associated with non-thermal processes occurring in the magnetospheres of their supermassive black holes. The present work aims to explore the adequacy of different gap-type (unscreened electric field) models to account for the observed characteristics. Based on a phenomenological description of the gap potential, we estimate the maximum extractable gap power L gap for different magnetospheric set-ups, and study its dependence on the accretion state of the source. L gap is found to be in general proportional to the Blandford-Znajek jet power L BZ and a sensitive function of gap sizeβ , where the power index β ≥ 1 is dependent on the respective gapsetup. The transparency of the black hole vicinity to VHE photons generally requires a radiatively inefficient accretion environment and thereby imposes constraints on possible accretion rates, and correspondingly on L BZ . Similarly, rapid variability, if observed, may allow to constrain the gap size h ∼ c∆t. Combining these constraints, we provide a general classification to assess the likelihood that the VHE gamma-ray emission observed from an AGN can be attributed to a magnetospheric origin. When applied to prominent candidate sources these considerations suggest that the variable (day-scale) VHE activity seen in the radio galaxy M87 could be compatible with a magnetospheric origin, while such an origin appears less likely for the (minute-scale) VHE activity in IC310.

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Electrodynamics of the magnetosphere of pulsars

Cited by 48 publications

References 1 publication

On particle acceleration and very high energy γ-ray emission in Crab-like pulsars

On particle acceleration and very high energy γ-ray emission in Crab-like pulsars

Atmospheres and radiating surfaces of neutron stars

Magnetospheric Gamma-Ray Emission in Active Galactic Nuclei

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