The suppression of pulsar and gamma-ray burst annihilation lines by magnetic photon splitting

Details The suppression of pulsar and gamma-ray burst annihilation lines by magnetic photon splitting The suppression of pulsar and gamma-ray burst annihilation lines by magnetic photon splitting

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262...20b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 1, p. 20-26.

Astronomy and Astrophysics

Astronomy

8

Annihilation Reactions, Crab Nebula, Elementary Particles, Gamma Ray Bursts, Pair Production, Stellar Magnetospheres, Kinetic Equations, Neutron Stars, Pulsars, Stellar Envelopes

Scientific paper

Neutron stars, relativistic and compact by nature, show great potential for the copious creation of electron-positron pairs in the magnetospheres; these rapidly cool, thermalize, and then annihilate. It is therefore expected that many neutron sources might display evidence of pair annihilation lines in the 400-500 keV range. It is shown that magnetic photon splitting, which operates effectively at these energies and in the enormous neutron star magnetic fields, can destroy an annihilation feature by absorbing line photons and reprocessing them to lower energies. In so doing, photon splitting creates a soft gamma-ray bump and a broad quasi-power-law contribution to the X-ray continuum, which is too flat to conflict with the observed X-ray paucity in gamma-ray bursts. The destruction of the line occurs in neutron stars with surface fields of 5 x 10 exp 12 G or maybe even less, depending on the size of the emission region.

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