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Jet-environment interactions in FRI radio galaxies

Authors :
Laing, R. A.
Bridle, A. H.
Publication Year :
2008
Publisher :
arXiv, 2008.

Abstract

There is now unequivocal evidence that the jets in FR I radio galaxies are initially relativistic, decelerating flows. On the assumption that they are axisymmetric and intrinsically symmetrical (a good approximation close to the nucleus), we can make models of their geometry, velocity, emissivity and field structure whose parameters can be determined by fitting to deep VLA observations. Mass entrainment - either from stellar mass loss within the jet volume or via a boundary layer at the jet surface - is the most likely cause for deceleration. This idea is quantitatively consistent with the velocity field and geometry inferred from kinematic modelling and the external gas density and pressure profiles derived from X-ray observations. The jets must initially be very light, perhaps with an electron-positron composition.<br />Comment: 10 pages, 9 figures, to appear in Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, T. A. Rector and D. S. De Young (eds.), ASP Conference Series

Details

Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....f1d7136af3006ee4d421065f01d94f6c
Full Text :
https://doi.org/10.48550/arxiv.0801.0147