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The spectral variability of the GHZ-peaked spectrum radio source PKS 1718-649 and a comparison of absorption models

Tingay, S. J.; Macquart, J.-P.; Collier, J. D.; Rees, G.; Callingham, J. R.; Stevens, J.; Carretti, E.; Wayth, R. B.; Wong, G. F.; Trott, C. M.; McKinley, B.; Bernardi, G.; Bowman, J. D.; Briggs, F.; Cappallo, R. J.; Corey, B. E.; Deshpande, A. A.; Emrich, D.; Gaensler, B. M.; Goeke, R.; Greenhill, L. J.; Hazelton, B. J.; Johnston-Hollitt, M.; Kaplan, D. L.; Kasper, J. C.; Kratzenberg, E.; Lonsdale, C. J.; Lynch, M. J.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Oberoi, D.; Ord, S. M.; Prabu, T.; Rogers, A. E. E.; Roshi, A.; Shankar, N. Udaya; Srivani, K. S.; Subrahmanyan, R.; Waterson, M.; Webster, R. L.; Whitney, A. R.; Williams, A.; Williams, C. L.


Using the new wideband capabilities of the ATCA, we obtain spectra for PKS 1718-649, a well-known gigahertz-peaked spectrum radio source. The observations, between approximately 1 and 10 GHz over 3 epochs spanning approximately 21 months, reveal variability both above the spectral peak at ~3 GHz and below the peak. The combination of the low- and high-frequency variability cannot be easily explained using a single absorption mechanism, such as free–free absorption or synchrotron...[Show more]

CollectionsANU Research Publications
Date published: 2015-01-28
Type: Journal article
Source: The Astronomical Journal
DOI: 10.1088/0004-6256/149/2/74


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