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Extra-galactic Radio Sources with Extended Structure

Published online by Cambridge University Press:  25 April 2016

R. T. Schilizzi  and
W. B. McAdam
R. T. Schilizzi
Affiliation:
Cornell-Sydney University Astronomy Centre, School of Physics, University of Sydney
W. B. McAdam
Affiliation:
Cornell-Sydney University Astronomy Centre, School of Physics, University of Sydney
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Extract

Most extra-galactic radio sources show angular structure over a wide range of size. Long-baseline interferometers and scintillation observations have shown that resolved sources extending over 10′ arc can have significant contributions from components <1″ arc. Observations at low frequency with the Molonglo cross telescope show also that a large fraction of the emission can come from halo, bridge or extended regions which may form a diffuse ridge or arc structure extending well beyond the small diameter components. However the majority of sources exhibit a basic double structure, and this has led to the adoption of two extended (Gaussian) components as an initial model for the interpretation of brightness distribution in most papers on the structure of extra-galactic sources. Parameters based on such a model will usually match the observed distribution quite well, but because of confusion, there is a danger in using intensity parameters for a model component to derive the spectral index for part of the source.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 1 , Issue 7 , April 1970 , pp. 337 - 340
Copyright
Copyright © Astronomical Society of Australia 1970

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References

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