Radio spectral variability of the nearby GPS galaxy PKS 1718-649

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/1152

Title: Radio spectral variability of the nearby GPS galaxy PKS 1718-649
Author(s): De Kool, M.; Tingay, Steven J.
Abstract: Data from new Australia Telescope Compact Array observations of a nearby gigahertz peaked spectrum radio source, PKS 1718-649, show significant variability both below and above the spectral turnover frequency during a nine month period. Simple models of synchrotron self-absorption (SSA) and free-free absorption (FFA) cannot explain the individual spectra or the spectral variability. Novel SSA or FFA models will need to be investigated in order to explain the complex variability in this source. Some potential explanations for the spectral variability are explored here but we can make no strong conclusion about which of SSA or FFA (or alternative mechanisms) causes the peaked spectrum in PKS 1718-649.
Publication type: Journal article
Research centre: Swinburne University of Technology. School of Biophysical Science and Electrical Engineering
Source: Publications of the Astronomical Society of Australia, Vol. 20, no. 1 (2003), pp. 140-143
Publication year: 2003
Publisher: CSIRO Publishing
Format: pp. 140-143
ISSN: 1323-3580
Publisher URL: http://dx.doi.org/10.1071/AS02045
Peer reviewed