| Issue |
EPJ Web of Conferences
Volume 61, 2013
The Innermost Regions of Relativistic Jets and Their Magnetic Fields
|
|
|---|---|---|
| Article Number | 03004 | |
| Number of page(s) | 6 | |
| Section | Jet from stellar-mass objects | |
| DOI | https://doi.org/10.1051/epjconf/20136103004 | |
| Published online | 09 December 2013 | |
https://doi.org/10.1051/epjconf/20136103004
Spectra and fast multi-wavelength variability of compact jets powered by internal shocks
1 Université de Toulouse; UPS-OMP; IRAP ; Toulouse, France,
2 CNRS; IRAP ; 9 Av. colonel Roche, BP 44346, F-31028 Toulouse cedex 4, France
a e-mail: Julien.malzac@irap.omp.eu
Published online: 9 December 2013
The emission of steady compact jets observed in the hard spectral state of X-ray binaries is likely to be powered by internal shocks caused by fluctuations of the outflow velocity. The dynamics of the internal shocks and the resulting spectral energy distribution (SED) of the jet is very sensitive to the shape of the Power Spectral Density (PSD) of the fluctuations of the jet Lorentz factor. I used both Monte-Carlo simulations and semi-analytical methods to investigate this dependence. It turns out that Lorentz factor fluctuations injected at the base of the jet with a flicker noise power spectrum (i.e. P(f) 1/f) naturally produce the canonical flat SED observed from radio to IR band in X-ray binary systems in the hard state. This model also predicts a strong, wavelength dependent, variability that resembles the observed one. In particular, strong sub-second variability is predicted in the infrared and optical bands. The complex timing correlations observed between the IR/optical light curves and the X-rays can then be used to probe the accretion/ejection connection on short time-scales.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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