Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..290c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 290-294.
Astronomy and Astrophysics
Astrophysics
12
Accretion Disks, Gamma Ray Bursts, Pulsars, Stellar Mass Accretion, Stellar Radiation, X Ray Binaries, Gamma Ray Spectra, Magnetospheres, Particle Acceleration, Stellar Magnetic Fields, Synchrotron Radiation
Scientific paper
Cheng and Ruderman (1989) show that electrostatic acceleration regions (accelerator gaps) above the inner part of a Keplerian accretion disk of an X-ray pulsar can accelerate positively charged particles (protons/ions) to extreme relativistic energies (about 10 to the 15th eV) toward the disk. The subsequent collisions between such ultrarelativistic protons (ions) and the disk material can produce very high energy (VHE) primary gamma rays via the decay of neutral pions. It is shown that these 'primary' gamma rays, with energies above 3 x 10 to the 12th B6 exp-1 eV, will be converted to secondary e electron-positron pairs by the local magnetic field. Secondary synchrotron radiation by these secondary pairs combined with the surviving primary gamma rays give the observed VHE gamma-ray spectrum. A comparison of the observed data with the model results is discussed.
Cheng Kwong Sang
Cheung Teddy
Lau Michael
Yu K. N.
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