1245+676 - a CSO/GPS source being an extreme case of a double-double structure

Details 1245+676 - a CSO/GPS source being an extreme case of a double-double structure 1245+676 - a CSO/GPS source being an extreme case of a double-double structure

2002-09-11

arxiv.org/abs/astro-ph/0209212v2

Astronomy and Astrophysics

Astrophysics

A contribution to The Third Workshop on Compact Steep Spectrum and GHz-Peaked Spectrum Radio Sources, Kerastari, Greece May 28

Scientific paper

10.1071/AS02032

AGN with the so-called `double-double' radio structure have been interpreted as restarted AGN where the inner structure is a manifestation of a new phase of activity which happened to begin before the outer radio lobes resulting from the previous one had faded completely. The radio galaxy 1245+676 is an extreme example of such a double-double object - its outer structure, measuring 970 h^{-1} kpc, is five orders of magnitude larger than the 9.6 h^{-1} pc inner one. We present a series of VLBI observations of the core of 1245+676 which appears to be a compact symmetric object (CSO). We have detected the motion of the CSO's lobes, measured its velocity, and inferred the kinematic age of that structure.

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