Steady, periodic gamma-ray emission from accreting X-ray pulsars

Details Steady, periodic gamma-ray emission from accreting X-ray pulsars Steady, periodic gamma-ray emission from accreting X-ray pulsars

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..480c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 480-485. Research supported by University and

Astronomy and Astrophysics

Astrophysics

3

Accretion Disks, Cyclotron Radiation, Gamma Ray Bursts, Pulsars, Synchrotron Radiation, X Ray Stars, Electron Acceleration, Electron-Positron Pairs, Pair Production

Scientific paper

The production mechanisms of medium-energy gamma-rays from accreting X-ray pulsars are studied. The models concern electrons accelerated in strongly shielded accelerators above the inner part of the accretion disk whose energies are limited by curvature radiation reactions. The curvature photons are sufficiently energetic to produce secondary e(+/-) pairs in collisions with the hard X-rays from the accretion shock front above the neutron star surface outside the acceleration regions, which are shielded from X-rays. A part of the synchrotron photons radiated by these secondary pairs is still energetic enough to produce a third generation of pairs which also emit synchrotron photons. These processes will continue until the energies of the synchrotron photons are low enough to avoid the pair production process in collision with the stellar X-rays. It is suggested that accreting X-ray pulsars with reported detection of transient very high energy gamma rays (e.g., Her X-1, Cen X-3, and Cyg X-3) should be detectable sources for the GRO in the energy range of 10 exp 5 to 10 exp 7 eV.

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