scholarly journals Pulsar magnetospheres and pulsar winds

Author(s):  
Vasily Beskin
Keyword(s):  
2000 ◽  
Vol 177 ◽  
pp. 527-528
Author(s):  
Lewis Ball ◽  
J. G. Kirk

AbstractWe investigate the modifications to the calculations of inverse Compton scattering by the wind of pulsar B1259–63 due to the inclusion of a realistic spectrum for the target photons from the pulsar’s Be-star companion.


2004 ◽  
Vol 218 ◽  
pp. 143-150
Author(s):  
A. Melatos

Recent progress in the theory of pulsar wind electrodynamics is reviewed, with emphasis on the following open questions, (i) Is the bipolar, jet-torus geometry imprinted by collimation or injection? (ii) what is the magnetic field geometry as a function of latitude, and is it stable? (iii) How rapidly does the postshock flow fluctuate, e.g. in the near infrared? (iv) The σ paradox: is Poynting flux converted gradually to kinetic energy flux as the wind expands, as in a linear accelerator, or is the conversion lossy, due to reconnection or parametric instabilities in a wave-like outflow?


2000 ◽  
Vol 177 ◽  
pp. 513-514
Author(s):  
Eric van der Swaluw ◽  
Abraham Achterberg ◽  
Yves A. Gallant

Shock waves in young supernova remnants (SNR) are generally considered to be the places where production and acceleration of charged particles (relativistic electrons and cosmic rays) take place. Older remnants can be re-energised if an active pulsar catches up with the shell of the remnant (Shull, Fesen, & Saken 1989). In that case a pulsar-driven wind can inject energetic particles into the shell, resulting into a rejuvenation of the radio emission of the old remnant due to the presence of additional relativistic electrons.Radio observations of CTB80 (Angerhofer et al. 1981) and G5.4-1.2 (Frail & Kulkarni 1991) give evidence for the importance of the presence of an active pulsar close to the old shell of the remnants. In the first case the pulsar is believed to be inside the SNR. In the second case the pulsar is thought to have penetrated the shell of the SNR, and resides in the interstellar medium (ISM). We intend to investigate the physics which are connected with these kind of systems. One expects new effects resulting from the interaction of the three different shocks; the SNR shock, the bowshock bounding the pulsar wind nebula (PWN) and the (pulsar) wind termination shock. The dynamics of the system is described by a hydrodynamics code. We use the results from the hydrodynamics code to investigate the process of acceleration and transport of particles which are advected by the flow and diffuse with respect to the flow. We have applied the latter to a simple problem, the case of a spherically expanding SNR.


2005 ◽  
Vol 13 ◽  
pp. 18-23 ◽  
Author(s):  
A. Melatos

AbstractRecent calculations of the neutrino fluxes and spectra from pulsar magnetospheres and wind nebulae are reviewed. The neutrinos, produced in pp and pγ collisions via pion decays, are a signature of TeV ions accelerated electrostatically in the magnetosphere, in the wind termination shock (Fermi), or in the wind neutral sheet (wave surfing and/or reconnection). The fluxes and spectra are related to the energy and density of the accelerated ion beam and the densities of the target species, thereby constraining ion-loaded pulsar wind models originally developed to explain the variable wisps in pulsar-driven supernova remnants. The neutrino signal may be detectable by km2 telescopes (e.g. IceCube) and is correlated with TeV γ-ray emission. Related sources are also reviewed, such as early-phase post-supernova pulsar winds, pulsar-driven γ-ray-burst afterglows, and accreting neutron stars. The possibility of long baseline oscillation experiments, to search for fine splitting of neutrino mass eigenstates and non-radiative neutrino decays, is noted.


1981 ◽  
Vol 95 ◽  
pp. 57-65 ◽  
Author(s):  
Wolfgang Kundt

It is argued that pulsar windzones are pulsed γ-ray emitters, and X-ray emitters. The wind consists of a strong subluminal wave, in approximate equipartition with a relativistic electron-positron plasma; it also contains a weak frozen-in magnetic flux. Trailing filaments may be responsible for large-angle particle scattering, giving rise to one-sided X-ray appearance.


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