Quasi-Stationary and Transient Patterns in Jets

Details Quasi-Stationary and Transient Patterns in Jets Quasi-Stationary and Transient Patterns in Jets

2010-11-02

arxiv.org/abs/1011.0572v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages. Invited review at the workshop "Steady jets and transient jets", Bonn, 7-8 April 2010. To be published in Memorie del

Scientific paper

Apparent evolution of relativistic flows as traced by radio emission results from a combination of several factors related to propagation of relativistic blobs or shocks, velocity, density and pressure stratification of the underlying flow, plasma instability and (possibly also) phase and time travel effect. This combination can create an intricate and chaotic patterns of the observed morphological changes in radio emission, which complicates the analysis and interpretation of kinematic and physical properties of the jet plasma. Recent studies have indicated that slow and quasi-stationary patterns in jets are most likely formed by plasma instabilities while faster, superluminally moving patterns are related to highly relativistic plasma condensations produced by the nuclear flares. Some of the stationary patterns may also be related to recollimation shocks or locations where strong non-thermal continuum is produced in jets. Similarities and differences of the AGN and XRB jets in this respect are reviewed.

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