Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-08
Astronomy and Astrophysics
Astrophysics
38 pages, 18 figures with an Appendix; ApJ in press (vol. 551, Apr. 20, 2001 issue)
Scientific paper
10.1086/320581
A complete sample of 27 radio galaxies was selected from the B2 and 3CR catalogs, in order to study their properties on the milliarcsecond scale. In the Appendix of this paper we present new radio images for 12 of them. Thanks to the present data, all the sources in this sample have been imaged at mas resolution. We discuss the general results. In particular we stress the evidence for high velocity jets in low power radio galaxies, we compare high and low power sources, and discuss the source properties in the light of the unified scheme models. We derive that the properties of parsec scale jets are similar in sources with different total radio power and kpc scale morphology. From the core - total radio power correlation, we estimate that relativistic jets with Lorentz factor $\gamma$ in the range 3 - 10 are present in high and low power radio sources. We discuss also the possible existence of a two velocity structure in the jets (fast spine and lower velocity external shear layer).
Cotton William D.
Feretti Luigina
Giovannini Gabriele
Lara Liana
Venturi Tiziana
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