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Astron. Astrophys. 325, 866-870 (1997)

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5. Summary and conclusions

We derived the full energy spectrum of injected pairs, produced by [FORMULA] - [FORMULA] pair production and compared the result to the various approximations known before. We found that the simplest expressions, based on [FORMULA] function approximation to the cross section can well reproduce the power-law tail of the injection spectrum, but have problems at low particle energies.

The approximation of Aharonian et al. (1983) was shown to be the most accurate one and even yields useful results in regimes for which this approach was not designed.

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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