A Disk--Jet interaction model for the X--Ray Variability in Microquasars

Abstract

We propose a simple dynamical model that may account for the observed spectral and temporal properties of GRS 1915+105 and XTE J1550-5634. The model is based on the assumption that a fraction of the radiation emitted by a hot spot lying on the accreting disk is dynamically Comptonized by the relativistic jet that typically accompanies the microquasar phenomenon. We show that scattering by the jet produces a detectable modulation of the observed flux. In particular, we found that the phase lag between hard and soft photons depends on the radial position of the hot spot and, if the angle between the jet and the line of sight is sufficiently large, the lags of the fundamental and its harmonics may be either positive or negative.

14 pages, 4 figures, accepted for publication in ApJ Part I

References in corpus (6)

• An unusually massive stellar black hole in the Galaxy
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• Accretion-ejection instability and QPO in black hole binaries. I. Observations
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Cited by in corpus (3)

• A General Relativistic Magnetohydrodynamics Simulation of Jet Formation
• The complex time behaviour of the microquasar GRS 1915+105 in the ρ-class observed with BeppoSAX. III: The hard X-ray delay and limit cycle mapping
• Recurrent Instability in LMXB Accretion Disks: How Strange is GRS 1915+105?