Modelling the compact jet in MAXI J1836-194 with disc-driven shocks

Abstract

The black hole candidate MAXI J1836-194 was discovered in 2011 when it went into an outburst, and was the subject of numerous, quasi-simultaneous, multi-wavelength observations in the radio, infrared, optical and X-rays. In this paper, we model its multi-wavelength radio to optical spectral energy distributions (SEDs) with an internal shock jet model. The jet emission is modelled on five dates of the outburst, during which the source is in the hard and hard intermediate X-ray spectral states. The model assumes that fluctuations of the jet velocity are driven by the variability in the accretion flow which is traced by the observed X-ray timing properties of the source. While the global shape of the SED is well reproduced by this model for all the studied observations, the variations in bolometric flux and typical energies require at least two parameters to evolve during the outburst. Here we investigate variations of the jet power and mean Lorentz factor, which are both found to increase with the source luminosity. Our results are compatible with the evolution of the jet Lorentz factor reported in earlier studies of this source. However, due to the large degeneracy of the parameters of the ishem model, our proposed scenario is not unique.

arXiv comment13 pages, 8 figures

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• Swift J1727.8-1613 has the Largest Resolved Continuous Jet Ever Seen in an X-ray Binary
• High-energy Cosmic Ray production in X-ray Binary Jets
• The INTEGRAL view on Black Hole X-ray Binaries
• Correlating spectral and timing properties in the evolving jet of the micro blazar MAXI J1836-194
• Bhjet: a public multi-zone, steady state jet + thermal corona spectral model
• On the nature of the soft gamma-ray emission in the hard state of the black hole transient GRS 1716-249
• Clues on jet behavior from simultaneous radio-X-ray fits of GX339-4
• Colors and patterns of black hole X-ray binary GX 339-4
• Testing jet geometries and disk-jet coupling in the neutron star LMXB 4U 0614+091 with the internal shocks model
• Thermal solutions of strongly magnetized disks and the hysteresis in X-ray binaries
• Tracking optical variability and outflows across the accretion states of the black hole transient MAXI J1820+070
• Shock corrugation to the rescue of the internal shock model in microquasars: The single-scale MHD view