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Distortions in Compact Steep-Spectrum Radio Sources

Published online by Cambridge University Press:  04 August 2017

P. N. Wilkinson ,
R. E. Spencer ,
A.C.S. Readhead ,
T.J. Pearson  and
R.S. Simon
P. N. Wilkinson
Affiliation:
Nuffield Radio Astronomy Laboratories, Jodrell Bank
R. E. Spencer
Affiliation:
Nuffield Radio Astronomy Laboratories, Jodrell Bank
A.C.S. Readhead
Affiliation:
Owens Valley Observatory, California Institute of Technology
T.J. Pearson
Affiliation:
Owens Valley Observatory, California Institute of Technology
R.S. Simon
Affiliation:
Naval Research Laboratory, Washington, D.C.

Extract

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The size, and therefore the importance, of the population of compact, steep-spectrum, radio sources has only recently been recognised. While it is now clear that the extended steep-spectrum sources are powered by a pair of, originally anti-parallel, beams which transport energy to the outer lobes some 105–106 parcsec away, our understanding of the compact steep-spectrum sources is almost nil. This is largely because our radio maps have not had high enough resolution to show their structures in any detail. However 1.67 and 5 GHz MERLIN observations (resolutions 0″.25 and 0″.1) of the ~20 steep-spectrum 3CR sources whose LAS is ≲2″ have now allowed us to classify their structures, at least in broad terms. These MERLIN maps, and recent VLBI maps, show that while there is a wide range of structures - from colinear doubles to amorphous “blobs” - the “peculiar” structures are strongly concentrated in the objects whose optical counterparts are called QSO's.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 110: VLBI and Compact Radio Sources , 1984 , pp. 25 - 28
Copyright
Copyright © Reidel 1984 

References

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