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Dual frequency VSOP imaging of the jet in S5 0836+710

A. P. Lobanov·T. P. Krichbaum·A. Witzel·J. A. Zensus
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Abstract

The luminous high-redshift (z=2.17) quasar S50836+710 has been observed in October 1997 with the VSOP at 1.6 GHz and 5 GHz. We report here a previously unpublished image made from the data at 1.6 GHz and compare the structure of a relativistic jet in this quasazr at the two frequencies. We present a spectral index image tracing spectral properties of the jet up to ~40 milliarcsecond distance from the nucleus. The curved jet ridge line observed in the images and the spectral index distribution can be described by Kelvin-Helmholtz instability developing in a relativistic outflow with a Mach number of ~6. In this description, the overall ridge line of the jet is formed by the helical surface mode of Kelvin-Helmholtz instability, while areas of flatter spectral index embedded into the flow correspond to pressure enhancements produced by the elliptical surface mode of the instability. An alternative explanation involving a sequence of slowly dissipating shocks cannot be ruled out at this point.

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A. P. Lobanov, T. P. Krichbaum, A. Witzel, J. A. Zensus. 2005-07-29. Dual frequency VSOP imaging of the jet in S5 0836+710. https://doi.org/10.1093/pasj%2F58.2.253

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