Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405l..13d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 405, no. 1, p. L13-L16.
Astronomy and Astrophysics
Astronomy
70
Active Galaxies, Deceleration, Galactic Structure, Luminosity, Radio Galaxies, Radio Jets (Astronomy), Boundary Layers, Galactic Evolution, Galactic Nuclei, Photometry, Stellar Color
Scientific paper
Recent optical observations of radio galaxies reveal a transition from F-R II morphology to F-R I morphology with increasing optical luminosity at fixed radio luminosity. This transition can occur if a highly supersonic jet which normally fuels F-R II sources is instead strongly decelerated near the nucleus, producing the transonic or subsonic flow which gives rise to the F-R I morphology at the same radio power. It is shown that this deceleration can occur if the more optically luminous galaxies possess a dense inner ISM core, with an average density of order 10/cu cm and a radius of order 1 kpc. The turbulent boundary layer of the high Reynolds number jet passing through this core entrains the ISM and imparts momentum to it, causing the jet to decelerate.
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