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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



ID: 125471.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Proper motions in compact symmetric objects
Authors:Polatidis, A. G.; Conway, J. E.
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Publications of the Astronomical Society of Australia
Journal Abbrev.:Publ. Astron. Soc. Aust.
Volume:20
Issue / Number:1
Start Page:69
End Page:74
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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(less than or equal to3 x 10(3) 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.
Free Keywords:galaxies : active, galaxies : compact, galaxies : evolution
Comment of the Author/Creator:Date: 2003
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Max Planck Inst Radioastron, D-53010 Bonn, Germany.; Chalmers Tech Univ, Onsala Space Observ, S-43992 Onsala, Sweden.
Identifiers:ISI:000183277800019 [ID No:1]
ISSN:1323-3580 [ID No:2]
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