Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431..724c&link_type=abstract
The Astrophysical Journal, vol. 431, no. 2, pt. 1, p. 724-731
Astronomy and Astrophysics
Astronomy
27
Electron-Positron Pairs, Emission Spectra, Gamma Ray Spectra, Gamma Rays, Pulsars, Pulsed Radiation, Cosmology, Electrostatics, Gamma Ray Astronomy, Spectrum Analysis, Stellar Evolution, Synchrotron Radiation
Scientific paper
We study the gamma-ray emission mechanisms from pulsars with period, P, between 4.6 x 10-2 B2/5 12 s and 0.17 B5/12 sin1/6 theta alpha -5/4 s in terms of outermagnetospheric gap model, in which electrostatic accelerators have been proposed to exist in regions near the null charge surfaces where OMEGA times B = 0. We found that the spectra of all known gamma-ray pulsars can be fitted by two free parameters, namely, alpha rL, the mean distance to the outergap, and sin theta, the mean pitch angle of the secondary electron positron pairs. Gamma-rays from those pulsars with P less than approximately 0.17 B5/12 sin1/6 theta alpha-5/4 are mainly emitted by secondary electron positron pairs, which are created beyond the outergap, via synchrotron radiation and the gamma-ray emission efficiency is approximately 10-2. For pulsars with period approaching approximately 0.17 B5/12 sin1/6 theta alpha-5/4 s, their gamma-ray emission efficiency is approaching unity. The comparison of model results and the observed data, including gamma-ray spectrum, efficiency, relative intensity, and phase separation of pulses are discussed in the text.
Cheng Kwong Sang
Ding Winnis K. Y.
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