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Proper Motions in Compact Symmetric Objects

Published online by Cambridge University Press:  05 March 2013

A. G. Polatidis  and
J. E. Conway
A. G. Polatidis
Affiliation:
Max Planck Institut für Radioastronomie, Postfach 2024, D-53010, Bonn, Germany
J. E. Conway
Affiliation:
Onsala Space Observatory, Chalmers Technical University, Onsala S-43992, Sweden
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Abstract

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We discuss recent measurements of proper motions of the hotspots of compact symmetric objects (CSOs). Source expansion has been detected in 10 CSOs so far and all these objects are very young (≤ 3 × 103 yr). In a few sources ages have also been estimated from energy supply and spectral ageing arguments and these estimates are comparable. This argues that these sources are close to equipartition and that standard spectral ageing models apply. Proper motion studies are now constraining hotspot accelerations, side-to-side motions, and differences in hotspot advance speeds between the two hotspots of a source. Although most CSOs are young sources their evolution is unclear. There is increasing evidence that in some objects the CSO structure represents a new phase of activity within a recurrent source.

Keywords

galaxies: activegalaxies: compactgalaxies: evolution
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 69 - 74
Copyright
Copyright © Astronomical Society of Australia 2003

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