Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4106d&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #41.06; Bulletin of the American Astronomical Society, Vol. 24, p.1184
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent optical observations of radio galaxies reveal a transition from FRII morphology to FRI morphology with increasing optical luminosity at fixed radio luminosity. This transition can occur if a highly supersonic jet which normally fuels FRII sources is instead strongly decelerated near the nucleus, producing the transonic or subsonic flow which gives rise to the FRI 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 10cm(-3) 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. A search of available photometry for these galaxies shows no significant color differences in B-V between the FRI and FRII objects, but a larger sample with emphasis on photometry of the nuclear region is required before any definitive conclusions can be drawn about differences in color.
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