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Search for Structural Changes in the Cores of “Nearby” Radio Galaxies

Published online by Cambridge University Press:  19 July 2016

E. Preuss  and
W. Alef
E. Preuss
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-5300 Bonn 1 Fed. Rep. of Germany
W. Alef
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-5300 Bonn 1 Fed. Rep. of Germany

Extract

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Recent VLBI observations of the central radio components in the lobe-dominated radio galaxies 3C111 (Götz et al. 1987) and 3C390.3 (Alef et al. 1987) show drastic changes in the structure of the compact emission regions. In 3C111 a jet-like feature with two knots and a flux density of 600 mJy which was visible in 1980.4 had disappeared in 1985.4. This implies “superluminal behaviour” with a characteristic speed of ≳ 3c. In 3C390.3, there is also evidence for superluminal motion: radio knots appear to be ejected from the core at a rate of about one every 4 years and move out with an apparent velocity of 4.1 c (Ho = 50 km/s/Mpc throughout this paper) in the direction of the north-west extended lobe.

Type
Chapter VIII: Galaxies and Clusters
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 537 - 541
Copyright
Copyright © Reidel 1987 

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