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Variability in GPS Sources

Citation

Jauncey, DL and King, EA and Bignall, HE and Lovell, JEJ and Kedziora-Chudczer, L and Tzioumis, AK and Tingay, SJ and Macquart, JP and McCulloch, PM, Variability in GPS Sources, Publications of the Astronomical Society of Australia, 20, (1) pp. 151-155. ISSN 1323-3580 (2003) [Refereed Article]

DOI: doi:10.1071/AS03023

Abstract

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. © Astronomical Society of Australia 2003.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Lovell, JEJ (Dr Jim Lovell)
Author:McCulloch, PM (Professor Peter McCulloch)
ID Code:46452
Year Published:2003
Web of Science® Times Cited:10
Deposited By:Physics
Deposited On:2007-08-01
Last Modified:2007-08-31
Downloads:0

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