Gamma Rays from Galactic Black Hole Candidates with Stochastic Particle Acceleration | Zendy

Hui Li | Zendy; M. Kusunose | Zendy; Edison Liang | Zendy

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Gamma Rays from Galactic Black Hole Candidates with Stochastic Particle Acceleration

Author(s) -

Hui Li,

M. Kusunose,

Edison Liang

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309960

Subject(s) - physics , particle acceleration , astrophysics , black hole (networking) , acceleration , gamma ray , compton scattering , population , electron , nuclear physics , quantum mechanics , computer network , routing protocol , routing (electronic design automation) , demography , sociology , computer science , link state routing protocol

We consider stochastic particle acceleration in plasmas around stellar massblack holes to explain the emissions above 1 MeV from Galactic black holecandidates. We show that for certain parameter regimes, electrons can overcomeCoulomb losses and be accelerated beyond the thermal distribution to form a newpopulation, whose distribution is broad and usually not a power law; the peakenergy of the distribution is determined by the balance between accelerationand cooling, with particles piling up around it. Radiation by inverse Comptonscattering off the thermal (from background) and non-thermal (produced byacceleration) particles can in principle explain the hard X-ray to gamma-rayemissions from black hole candidates. We present model fits of Cyg X-1 and GROJ0422 in 50 keV -- 5 MeV region observed with OSSE and COMPTEL.Comment: 2 figures, to appear in March 20 of ApJ

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