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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 sciences |
Research Field: | Galactic astronomy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS Author: | Lovell, JEJ (Dr Jim Lovell) |
UTAS Author: | McCulloch, PM (Professor Peter McCulloch) |
ID Code: | 46452 |
Year Published: | 2003 |
Web of Science® Times Cited: | 13 |
Deposited By: | Physics |
Deposited On: | 2007-08-01 |
Last Modified: | 2007-08-31 |
Downloads: | 0 |
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