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The Nature of a Homogeneous Sample of Compact Radio Sources Variable at 151 MHz

Published online by Cambridge University Press:  12 April 2016

A. R. Minns ,
J. M. Riley ,
P. J. Warner ,
M. J. Rioja  and
H. J. A. Röttgering
A. R. Minns
Affiliation:
Mullard Radio Astronomy Observatory, Cambridge, U.K.
J. M. Riley
Affiliation:
Mullard Radio Astronomy Observatory, Cambridge, U.K.
P. J. Warner
Affiliation:
Mullard Radio Astronomy Observatory, Cambridge, U.K.
M. J. Rioja
Affiliation:
Joint Institute for VLBI in Europe, Dwingeloo, The Netherlands
H. J. A. Röttgering
Affiliation:
Sterrewacht Leiden, Leiden, The Netherlands

Abstract

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Global VLBI snapshot observations at 1.6 GHz (5 EVN + 4 VLBA) of a sample of low-frequency variable (LFV) radio sources found using the Cambridge Low Frequency Synthesis Telescope (CLFST) are presented. Variability at 151 MHz is almost certainly due to propagation effects in our Galaxy (e.g., refractive interstellar scintillation). Theory indicates that only sources with a significant fraction of their low-frequency flux coming from components with angular sizes ≲ 30 mas will show such effects. This is confirmed by the VLBI images.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 281 - 282
Copyright
Copyright © Astronomical Society of the Pacific 1998

References

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