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Radio Spectral Variability of the Nearby GPS Galaxy PKS 1718–649

  • S. J. Tingay (a1) and M. de Kool (a2)
Abstract
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.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

G. V. Bicknell , M. A. Dopita , & C. P. O'Dea 1997, APJ, 485, 112 (BDO97)

M. de Kool , & M. C. Begelman 1989, APJ, 345, 135

A. V. Filippenko 1985, APJ, 289, 475

R. A. E. Fosbury , U. Mebold , W. M. Goss , & H. van Woerden 1977, MNRAS, 179, 89

W. C. Keel , & R. A. Windhorst 1991, APJ, 383, 135

K. I. Kellerman , & I. I. K. Pauliny-Toth 1981, ARA&A, 19, 373

C. P. O'Dea 1998, PASP, 110, 493

S. J. Tingay , et al.1997, AJ, 113, 2025

S. J. Tingay , et al.2002, APJS, 141, 311

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Publications of the Astronomical Society of Australia
  • ISSN: 1323-3580
  • EISSN: 1448-6083
  • URL: /core/journals/publications-of-the-astronomical-society-of-australia
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