出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In the inner regions of an accretion disk around a black hole, relativistic protons can interact
with ambient matter to produce electrons, positrons and g -rays. The final steady state electron
and positron spectrum are self-consistently calculated by solving an integro-differential equation
where the Coulomb and Compton cooling of particles, e± pair production due to g −g annihilation
and pair annihilation are taken into account. The resultant g -ray spectrum shows that the
contribution of high energy photons (E > 0.8 MeV) could be entirely due to p− p interactions.
The observedX-ray/g -ray spectrum of Cyg X-1, in Hard and Soft states, are fitted with the present
model. It is shown that GLAST will be able to detect black hole binaries and provide evidence
for the presence of non-thermal protons in the accretion disk
