Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294...57r&link_type=abstract
Nature, vol. 294, Nov. 5, 1981, p. 57-59.
Astronomy and Astrophysics
Astronomy
8
Extragalactic Radio Sources, Particle Beams, Radio Astronomy, Relativistic Particles, Astronomical Maps, Brightness Distribution, Radio Emission
Scientific paper
While the extended lobes of radio emission found in many extragalactic sources are assumed to be powered by oppositely directed supply beams of relativistic particles emanating from the central galactic nucleus, the structure's complexity and asymmetry in the cases of many sources have led to a hypothetical, 'flip-flop' beam mechanism by which energy is alternately supplied to each radio lobe. High-resolution observations of the radio structure of 3C133 show a structure in which source axis rotation offers evidence for the hypothesized bistable energy supply. Difficulties are noted for this hypothesis in that past luminosities would have to have been several hundred times greater than at present, with a great energy decrease over three outbursts, and in explaining the detection of emission from all the outer components at 15.4 GHz.
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