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

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dc.contributor.authorTingay, Steven J
dc.contributor.authorde Kool, Marthijn
dc.date.accessioned2015-12-13T22:37:42Z
dc.date.available2015-12-13T22:37:42Z
dc.date.issued2003
dc.date.updated2015-12-11T09:37:49Z
dc.description.abstractData 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.
dc.identifier.issn1323-3580
dc.identifier.urihttp://hdl.handle.net/1885/77212
dc.publisherCSLI Publications
dc.sourcePublications of the Astronomical Society of Australia
dc.subjectKeywords: Galaxies: active; Galaxies: individual (PKS 1718-649); Radio continuum: galaxies; Techniques: interferometric
dc.titleRadio spectral variability of the nearby GPS galaxy PKS 1718-649
dc.typeJournal article
local.bibliographicCitation.lastpage143
local.bibliographicCitation.startpage140
local.contributor.affiliationTingay, Steven J, CSIRO, Australia Telescope National Facility
local.contributor.affiliationde Kool, Marthijn, College of Physical and Mathematical Sciences, ANU
local.contributor.authoruidde Kool, Marthijn, u9718584
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub6103
local.identifier.citationvolume20
local.identifier.doi10.1071/AS02045
local.identifier.scopusID2-s2.0-32444441800
local.type.statusPublished Version

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