Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...363..575z&link_type=abstract
Astronomy and Astrophysics, v.363, p.575-584 (2000)
Astronomy and Astrophysics
Astrophysics
22
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.
Cheng Kwong Sang
Zhang Lianchang
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