One-photon and two-photon annihilation lines in gamma-bursts. II

Details One-photon and two-photon annihilation lines in gamma-bursts. II One-photon and two-photon annihilation lines in gamma-bursts. II

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.112...25z&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 112, no. 1, May 1985, p. 25-49.

Astronomy and Astrophysics

Astrophysics

3

Annihilation Reactions, Gamma Ray Bursts, Line Spectra, Neutron Stars, Stellar Magnetic Fields, Stellar Radiation, Luminosity, Pair Production, Radiative Transfer, Stellar Luminosity

Scientific paper

This paper, which is a continuation of Paper I (Zheleznyakov and Litvinchuk, 1985), studies the formation of a one-quantum annihilation line in the spectrum of gamma-ray bursts. The radiative transfer equation together with the positron density balance relation is solved, and the expected photon fluxes in the one- and two-quantum annihilation lines are calculated. The fractional luminosities of these lines versus source parameters are investigated. For a gamma-burst one-photon annihilation line, the luminosity is always much less than that for the two-photon line - i.e., the positron source power transforms almost entirely into radiation in the two-quantum annihilation line and the positron density depends solely on the specific source power and two-quantum annihilation probability. The flux of one-quantum annihilation quanta 1 MeV is estimated to be less than what modern detectors can resolve. This explains failure to detect the one-photon annihilation lines in gamma-bursts so far.

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