Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337l..77c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. L77-L79.
Astronomy and Astrophysics
Astronomy
49
Gamma Ray Astronomy, Pulsars, Stellar Mass Accretion, X Ray Stars, Accretion Disks, Periodic Variations, Pions, X Ray Binaries
Scientific paper
Very high energy pulsed gamma-rays have been reported from several accreting X-ray binaries. A model is considered here which gives efficient gamma-ray production in 1000-second bursts and period differences of the observed magnitude. The key feature is acceleration of ultrahigh energy particles through the inner accretion disk in which there is radial flow toward the star as well as Keplerian motion around it. Participating in this inward flow are disk annuli which have a thickness small enough to allow decay gamma-rays from pi(0) mesons to escape. The consequences of this model for burst duration and the related period shift are discussed. A proposed particle accelerator of appropriate power which accelerates 10 to the 15th eV nucleons into the disk is discussed.
Cheng Kwong Sang
Ruderman Malvin
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