2 Christian
نویسندگان
چکیده
We present a model for the radio outbursts of microquasars based on the assumption of quasi-continuous jet ejection. The jets arèlit up' by shock fronts trav-eling along the jets during outbursts. The shocks accelerate relativistic particles which emit the observed synchrotron radiation. The observed comparatively at decay light curves combined with gradually steepening spectral slopes are explained by a superposition of the radiation of the aging relativistic particle population left behind by the shocks. This scenario is the low energy, time-resolved equivalent to the internal shock model for GRBs. We show that this model predicts energy contents of the radiating plasma similar to the plasmon model. At the same time, the jet model relaxes the severe requirements on the central source in terms of the rate at which this energy must be supplied to the jet. Observations of`mini-bursts' with at spectral slopes and of infrared emission far from the source centre suggest two diierent states of jet ejections: (i) A `mini-burst' mode with relatively stable jet production and weak radio emission with at spectra and (ii) an outburst mode with strong variations in the jet bulk velocities coupled with strong radio emission with steeper spectra. We also show that the continuous jets in microquasars should terminate in strong shocks and possibly innate radio lobes similar to extragalactic jet sources. Finally, we investigate the possibility of testing the predictions of this model with resolved radio observations.
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