Ageing and speeds in a representative sample of 21 classical double radio sources

Details Ageing and speeds in a representative sample of 21 classical double radio sources Ageing and speeds in a representative sample of 21 classical double radio sources

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225....1a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 1, 1987, p. 1-26. SERC-supported research.

Astronomy and Astrophysics

Astronomy

228

Astronomical Spectroscopy, Electron Acceleration, Radio Sources (Astronomy), Energy Dissipation, Magnetic Flux, Periodic Variations, Red Shift, Spectrum Analysis, Synchrotron Radiation

Scientific paper

Four-frequency observations with the VLA and 5-km telescope have been analyzed in terms of synchrotron-loss theory to determine the spectral variations within the lobes of a representative sample of 21 3CR classical double radio sources. Values for the relative rate of separation of hotspot and lobe material, V(L), are not found to exceed the upper limit of 0.2c, and V(L) is shown to increase with radio power. The strong correlation between lobe speed and power is explained by a model in which the advancing hotspot leaves relativistic material behind in its path, with the high-power sources being associated with greater beam-momentum fluxes. The initial assumption of acceleration being mainly confined to the hotspots is invalidated, and the sources in which spectral ageing is anomalous are shown to have a structure different from that of a typical 'classical double'.

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