Proper Motions in Compact Symmetric Objects

Details Proper Motions in Compact Symmetric Objects Proper Motions in Compact Symmetric Objects

2002-12-05

arxiv.org/abs/astro-ph/0212122v1

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures, Accepted by Publications of the Astronomical Society of Australia (Vol. 20), as part of the proceedings o

Scientific paper

10.1071/AS02053

We discuss recent measurements of proper motions of the hotspots of Compact Symmetric Objects. Source expansion has been detected in ten CSOs so far and all these objects are very young (<3000 years). 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 motions studies are now constraining hotspot accelerations, side-to-side motions and differences in hotspot advance speeds between the two hotspots within sources. 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.

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