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1245+676 — A CSO/GPS Source being an Extreme Case of a Double-Double Structure

Published online by Cambridge University Press:  05 March 2013

Andrzej Marecki ,
Peter D. Barthel ,
Antonis Polatidis  and
Izabela Owsianik
Andrzej Marecki
Affiliation:
Toruń Centre for Astronomy, Nicholas Copernicus University, Toruń, Poland.
Peter D. Barthel
Affiliation:
Kapteyn Institute, Department of Astronomy, Groningen University, The Netherlands.
Antonis Polatidis
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany.
Izabela Owsianik
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany.
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Abstract

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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 CSOs lobes, measured its velocity, and inferred the kinematic age of that structure.

Keywords

galaxies: activegalaxies: individual (1245+676)
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 16 - 18
Copyright
Copyright © Astronomical Society of Australia 2003

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