Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713003k&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #130.03; Bulletin of the American Astronomical Society, Vol. 33, p.714
Astronomy and Astrophysics
Astronomy
Scientific paper
Based on the three-dimensional outer magnetospheric gap model proposed by Cheng, Zhang and Ruderman (2000), the structure of the outer magnetospheric gaps of γ -ray pulsars is studied. The fractional size and the azimuthal extension of the outer gap are limited by the self-regulating photon-photon pair production within the gaps. When the period, period derivative, magnetic inclination angle to rotation axis and the observer's viewing angle of a pulsar are given, the relativistic retarded magnetosphere, outer magnetospheric gap structure and the emission of the four components of high energy radiation: nonthermal X-rays from synchrotron radiation emitted by the backflow of e+/- stream from the outer gaps at the inner magnetosphere; hard thermal X-rays from the polar cap emitted by the heat up of those backflow of e+/- stream; soft thermal X-rays from the entire stellar surface due to the redistribution of energy of the reflected hard thermal X-rays; and the γ -rays radiation by synchrotron self-Compton radiation above the outer gaps or synchrocurvature radiation within the outer gaps can be determined. Double-peaked structure in the γ -rays light curve is a natural result in this model, and the phase separation is determined by the inclination angle and the viewing position of the observer. The non-thermal X-rays emission also can give a good constraint for determining the inclination angle and viewing angle. If inclination angle is too small, the nonthermal X-rays is too weak to be observed. If the difference between the inclination angle and the viewing angle is too large, the hard thermal X-rays cannot not be detected.
Cheng Kwong Sang
Ko S. F.
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