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Variability in GPS Sources

Published online by Cambridge University Press:  05 March 2013

D. L. Jauncey ,
Edward A. King ,
Hayley E. Bignall ,
J. E. J. Lovell ,
Lucyna Kedziora-Chudczer ,
A. K. Tzioumis ,
S. J. Tingay ,
Jean-Pierre Macquart  and
P. M. McCulloch
D. L. Jauncey
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia.
Edward A. King
Affiliation:
Earth Observation Centre, CSIRO, GPO Box 3023, Canberra, ACT 2601, Australia.
Hayley E. Bignall
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia. Department of Physics and Mathematical Physics, University of Adelaide, SA 5005, Australia.
J. E. J. Lovell
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia.
Lucyna Kedziora-Chudczer
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia.
A. K. Tzioumis
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia.
S. J. Tingay
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia.
Jean-Pierre Macquart
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, The Netherlands.
P. M. McCulloch
Affiliation:
University of Tasmania, Tasmania, Australia.
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Abstract

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Flux density monitoring data at 2.3 and 8.4 GHz is presented for a sample of 33 southern hemisphere GPS sources, drawn from the 2.7 GHz Parkes survey. This monitoring data, together with VLBI monitoring data, shows that a small fraction of these sources, ∼10%, vary. Their variability falls into several categories: sources whose spectral classification is, at best, ephemeral on a timescale of years; sources with a stable GPS classification that vary, but retain their classification; and a small number of sources that exhibit interstellar scintillation, but that maintain a mean GPS spectrum. Existing data on GPS sources with higher frequency peaks, ≥3 GHz, reveals that many such sources vary. However, the majority of these sources possess a GPS spectrum only during outbursts, and hence should perhaps be classified as ephemeral GPS sources. In addition, significant levels of circular polarisation have been found in a number of GPS sources, both amongst the variables and non-variables. Remarkable amongst these is PKS 1519–273, which possesses strong and variable circular polarisation, and which exhibits IDV in all Stokes parameters.

Keywords

galaxies: activequasars: general
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 151 - 155
Copyright
Copyright © Astronomical Society of Australia 2003

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