The optical, X-ray and gamma-ray light curves and spectra of crab-like pulsars: PSR B0540-69 and PSR B1509-58

Astronomy and Astrophysics – Astrophysics

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Stars: Pulsars: Individual: Psr B0540-69, Stars: Pulsars: Individual: Psr B1509-58, Gamma Rays: Theory, X-Rays: Stars

Scientific paper

Based on the three dimensional outer magnetosphere model of pulsars proposed by Cheng, Ruderman and Zhang, we calculate the light curves and spectra of the Crab-like pulsars: PSR B0540-69 and PSR B1509-58. In this model, thermal photon emission from the entire stellar surface is due to the bombardment of the backflow charged particles from the outer gap and cyclotron resonance scattering (Cheng & Zhang 1999). Non-thermal photons are emitted by e+/- pairs produced by backflow charged particles from the outer gap through a synchrotron radiation mechanism near the stellar surface and in a finite region just above the outer gap through a synchrotron self-Compton mechanism. For PSR B1509-58, when the magnetic inclination and viewing angle are 60deg and 75deg respectively, the photon emission region has a mean thickness of ~ 0.11 RL, where RL is the radius of the light cylinder. The expected broad single pulse in optical, X-ray and gamma -ray energy bands are comparable with the observed light curves with a correct phase off-set with respect to the radio pulse, and the model spectrum is consistent with the observed spectrum. For PSR B0540-69, the calculated mean thickness of the photon emission region is ~ 0.21RL and the model light curve and spectrum are similar to the observed data if the magnetic inclination and viewing angle are 50deg and 76deg respectively.

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