Pair cascading in gamma-ray binaries

Details Pair cascading in gamma-ray binaries Pair cascading in gamma-ray binaries

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..139c&link_type=abstract

SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

In some gamma-ray binaries, pair production is strong and shapes the very high energy (VHE >100~GeV) radiation output. In LS 5039, a one-zone leptonic model reproduces the VHE gamma-ray modulation observed by HESS, but fails at orbital phases where gamma-gamma absorption is predominant. The development of pair cascading was proposed as an explanation for this discrepancy. We report on the formation of pair cascading radiation in a binary environment. One-dimensional and three-dimensional cascade radiation calculations are presented. The effect of the ambient magnetic field in the development of cascades is crucial and discussed.% We also report on the relevance of triplet pair production in pair cascading and pair cooling at very high energies (>5~TeV).

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