6533b825fe1ef96bd12829aa
RESEARCH PRODUCT
Energy and time-lag spectra of galactic black-hole X-ray sources in the low/hard state
Dimitris GianniosNikolaos D. KylafisPablo Reigsubject
PhysicsJet (fluid)Range (particle radiation)PhotonAstrophysics::High Energy Astrophysical PhenomenaMonte Carlo methodAstronomy and AstrophysicsAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICA:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]Spectral lineBlack holesymbols.namesakeFourier transformSpace and Planetary SciencesymbolsUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]Radio wavedescription
Most, probably all, accreting binaries that are believed to contain a black-hole emit radio waves when they are in the low/hard state. Whenever this radio emission has been resolved, a jet-like structure has become apparent. We propose that Compton upscattering of low-energy photons in the jet can explain both the energy spectra and the time lags versus Fourier frequency observed in the low/hard state of black-hole systems. The soft photons originate in the inner part of the accretion disk. We have performed Monte Carlo simulations of Compton upscattering in a jet and have found that for a rather wide range of values of the parameters we can obtain power-law high-energy X-ray spectra with photon-number index in the range 1.5–2 and power-law time lags versus Fourier frequency with index ∼0.7. The black-hole source Cyg X-1 in the low/hard state is well described by our model. Reig Torres, Pablo, Pablo.Reig@uv.es
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-04-29 |