The Fanaroff-Riley Transition and the Optical Luminosity of the Host Elliptical Galaxy

Details The Fanaroff-Riley Transition and the Optical Luminosity of the Host Elliptical Galaxy The Fanaroff-Riley Transition and the Optical Luminosity of the Host Elliptical Galaxy

2001-04-19

arxiv.org/abs/astro-ph/0104326v2

Astronomy & Astrophysics, 373, 100-105 (2001)

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure; typo corrected; refs updated; now published in A&A

Scientific paper

10.1051/0004-6361:20010572

We show that a model for radio source dynamics we had earlier proposed can readily reproduce the relationship between the radio power division separating the two Fanaroff-Riley classes of extragalactic radio sources and the optical luminosity of the host galaxy, as found by Owen and Ledlow (1994). In our scenario, when less powerful jets eventually slow down to the point that the advance of the working surface (i.e., hotspot) becomes subsonic with respect to the external gas, the jet's collimation is severely weakened. This criterion distinguishes the powerful and well collimated FR II sources from the weaker sources producing the less collimated FR I type morphologies.

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