Spectral ageing in a sample of 14 high-luminosity double radio sources

Details Spectral ageing in a sample of 14 high-luminosity double radio sources Spectral ageing in a sample of 14 high-luminosity double radio sources

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..545l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 4, Aug. 15, 1992, p. 545-571.

Astronomy and Astrophysics

Astronomy

119

Radio Sources (Astronomy), Stellar Luminosity, Stellar Spectra, Very Large Array (Vla), Angular Resolution, Brightness Distribution, Radio Spectra, Synchrotron Radiation

Scientific paper

Multifrequency observations of a sample of 14 high-luminosity 3C double radio sources are used in a discussion of their structures and spectral properties. The observations were made with the VLA at 1.4, 5, and 15 GHz and have resolutions of 0.4 or 1.2 arcsec. The high-luminosity sources are found to exhibit a wide range of structures. Most of them do not conform to the classic backflow structures of FRII sources. The low-brightness extension point towards and away from the nucleus, or transverse to the source axis. The structural variations are connected with those of spectra. The spectra are always flatter in the hotspots, and steepen into the diffuse lobe emision. This steepening is independent of the direction in which the lobe emission extends. The steepening in the HF radio spectra across the lobes is well interpreted in terms of synchrotron aging, from which a speed which separates the hotspot and a parcel of lobe material is derived. The separation speed increases with radio power, and reaches as high as 0.3 c.

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