Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294..729z&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 294, p. 729
Astronomy and Astrophysics
Astronomy
4
Magellanic Clouds, Gamma Rays, Pulsars, Diffuse Radiation, Astronomical Models, Stellar Models, Gamma Ray Spectra, Energy Spectra
Scientific paper
We study the contribution of young pulsars, with characteristic ages of less than 10 exp 6 yr, to the diffuse gamma-ray emission from the Large Magellanic Cloud (LMC). Based on the outer gap model for gamma-ray emission proposed by Zhang and Cheng and pulsar properties in the LMC given by Hartmann, Brown, and Schnepf, we simulate the properties of the young pulsars in the LMC. We show that gamma-rays produced by the pulsars in the LMC may make an important contribution to the diffuse gamma-rays in the LMC, especially in the high-energy range. We calculate the gamma-ray energy spectrum of the pulsars in the LMC and show that the gamma-ray component contributed by the pulsars to the diffuse gamma-rays in the high-energy range (above about 1 GeV) becomes dominant. We expect that none of the young pulsars should be detectable as an individual point source of gamma-ray emission by EGRET. We also expect that pulsar contribution above about 1 GeV in the SMC is very important.
Cheng Kwong Sang
Zhang Lianchang
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