A jet model for Galactic black-hole X-ray sources: Some constraining correlations

Details A jet model for Galactic black-hole X-ray sources: Some constraining correlations A jet model for Galactic black-hole X-ray sources: Some constraining correlations

2008-07-18

arxiv.org/abs/0807.2910v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:20079159

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 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 the photon index and the time lag. 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 of the resulting photon number spectra. We demonstrate that our jet model naturally explains the above correlations, with no additional requirements and no additional parameters.

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