Volume 489, Number 2, October II 2008
|Page(s)||481 - 487|
|Published online||23 July 2008|
A jet model for Galactic black-hole X-ray sources: some constraining correlations
Physics Department, University of Crete, PO Box 2208, 710 03 Heraklion, Crete, Greece e-mail: firstname.lastname@example.org
2 Foundation for Research and Technology-Hellas, PO Box 1527, 711 10 Heraklion, Crete, Greece
3 Max Planck Institute for Astrophysics, Box 1317, 85741 Garching, Germany
4 Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK
Accepted: 11 July 2008
Context. Some recent observational results impose significant constraints on all the models that have been proposed to explain the Galactic black-hole X-ray sources in the hard state. In particular, it has been found that during the hard state of Cyg X-1 the power-law photon number spectral index, Γ, is correlated with the average time lag, , between hard and soft X-rays. Furthermore, the peak frequencies of the four Lorentzians that fit the observed power spectra are correlated with both Γ and .
Aims. We have investigated whether our jet model can reproduce these correlations.
Methods. We performed Monte Carlo simulations of Compton upscattering of soft, accretion-disk photons in the jet and computed the time lag between hard and soft photons and the power-law index Γ of the resulting photon number spectra.
Results. We demonstrate that our jet model naturally explains the above correlations, with no additional requirements and no additional parameters.
Key words: radiation mechanisms: non-thermal / accretion, accretion disks / black hole physics / methods: statistical / X-rays: binaries
© ESO, 2008
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