Gamma-ray pulsars: At the tip of the iceberg

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Pulsars, Gamma-Ray Sources, Gamma-Ray Bursts, X- And Gamma-Ray Telescopes And Instrumentation, Radio Sources

Scientific paper

Although the theory of pulsar acceleration and high energy emission has been studied for over 25 years, the origin of the pulsed γ-rays is a question that remains unanswered. Characteristics of the seven γ-ray pulsars detected by CGRO could not clearly distinguish between an emission site at the magnetic poles (polar cap models) and emission from the outer magnetosphere (outer gap models). The two types of models make contrasting predictions for the numbers of radio-loud and radio-quiet γ-ray pulsars and for their spectral characteristics. GLAST will probably detect at least 50 radio-selected pulsars and possibly more radio-quiet pulsars. With this large sample, it will be possible to fully test the model predictions and finally resolve this longstanding question. .

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