Journal ArticleDOI
Magnetic Compton-induced Pair Cascade Model for Gamma-Ray Pulsars
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TLDR
In this article, an analytic model of magnetic Compton scattering near the polar cap of isolated pulsar magnetospheres was proposed to model the pair cascade induced by relativistic electrons scattering photons through cyclotron resonance.Abstract:
Electrons accelerated to relativistic energies in pulsar magnetospheres will Compton scatter surface thermal emission and nonthermal optical, UV, and soft X-ray emission to gamma-ray energies, thereby initiating a pair cascade through synchrotron radiation and magnetic pair production. This process is proposed as the origin of the high-energy radiation that has been detected from six isolated pulsars. We construct an analytic model of magnetic Compton scattering near the polar cap of isolated pulsar magnetospheres and present approximate analytic derivations for scattered spectra, electron energy-loss rates, and photon luminosities. A Monte Carlo simulation is used to model the pair cascade induced by relativistic electrons scattering photons through the cyclotron resonance. For simplicity, the primary electrons are assumed to be monoenergetic and the nonresonant emission is omitted. Assuming that the angle phi(sub B) between the magnetic and spin axes is approximately equal to the polar-cap angle theta(sub pc), this model can produce both double-peaked and broad single-peaked pulse profiles and account for the trend of harder gamma-ray spectra observed from older pulsars.read more
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Journal ArticleDOI
Two-Pole Caustic Model for High-Energy Light Curves of Pulsars
Jaroslaw Dyks,B. Rudak +1 more
TL;DR: In this paper, a model of high-energy light curves from rotation-powered pulsars is presented, where the key ingredient of the model is the gap region (i.e., the region where particle acceleration is taking place and high energy photons originate) that satisfies the following assumptions: (1) the gap is thin and confined to the surface of last open magnetic-field lines; (2) photon emissivity is uniform within the gap; and (3) the model light curves are dominated by strong peaks of caustic origin.
Journal ArticleDOI
Full Polar Cap Cascade Scenario: Gamma-Ray and X-Ray Luminosities from Spin-powered Pulsars
TL;DR: Lu et al. as mentioned in this paper proposed a full-cascade model with the ICS of the higher generation pairs and derived the thermal and non-thermal X-ray luminosities for all the possible ICS branches contributing to a certain energy band.
Journal ArticleDOI
Time-dependent pair cascades in magnetospheres of neutron stars - I. Dynamics of the polar cap cascade with no particle supply from the neutron star surface
Andrey Timokhin,Andrey Timokhin +1 more
TL;DR: In this article, a general numerical algorithm for doing self-consistent kinetic simulations of electron-positron cascades is presented, where particle acceleration, pair creation and screening of the electric field are simultaneously calculated.
Journal ArticleDOI
Resonant cyclotron scattering and Comptonization in neutron star magnetospheres
TL;DR: In this article, the authors derive semi-analytically modification of the surface Planckian emission due to multiple scattering between the resonant layers and apply the model to the anomalous X-ray pulsar 1E 1048.1 − 5937.
Journal ArticleDOI
Relativistic effects and polarization in three high-energy pulsar models
TL;DR: In this paper, the influence of the relativistic effects of aberration and light travel time delay on pulsar high-energy lightcurves and polarization characteristics predicted by three models: the two-pole caustic model, the outer gap model, and the polar cap model.
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