Abstract
This paper and subsequent Paper II are an investigation of the annihilation line formation in gamma-ray bursts based on the assumption of positron production in a strong magnetic field (because of one-photon absorption of hard gamma-quanta radiated in the neutron star hot polar spot). We discuss a two-photon annihilation line in this paper. It is shown that if the star magnetic field is greater than 3×1012 G, the relative flux in the line depends solely on the hardness of the continuum and is, as a rule, less than or about 10–20% of the total flux. This is consistent with the spectral data recorded by ‘Venera-11’ and ‘Venera-12’ space probes. The annihilation region formation above the hot polar spot is discussed, and positron density and annihilation region dimensions are estimated.
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Zheleznyakov, V.V., Litvinchuk, A.A. One-photon and two-photon annihilation lines in gamma-bursts, I. Astrophys Space Sci 109, 293–307 (1985). https://doi.org/10.1007/BF00651276
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DOI: https://doi.org/10.1007/BF00651276