J/MNRAS/369/449ivo://CDS.VizieR/J/MNRAS/369/449doi:10.26093/cds/vizier.73690449CDSKedziora-Chudczer L.2024-07-02T20:17:41Z2007-04-04T23:07:56ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarspolarimetryradio-sourcesThe quasar PKS 0405-385 is one of three radio sources (the other two are PKS 1257-326 and J1819+385) which exhibit unusually strong and rapid interstellar scintillations at GHz frequencies. Such a behaviour suggests a nearby (<30pc away) scattering screen along the line of sight to these radio sources. While quasars PKS 1257-326 and J1819+385 scintillate continuously over several years of monitoring, PKS 0405-385 shows episodes of strong scintillations which last only a few months. Here, I present the results of flux-density monitoring of PKS 0405-385 over 6yr at four Stokes parameters and four frequencies. Two explanations of the episodic behaviour of interstellar scintillation in this source are discussed; morphological evolution of the source and changes in the properties of the interstellar medium along the line of sight.2006MNRAS.369..449Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/369/449CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/325/1411 : ATCA Intraday Variability Survey (Kedziora-Chudczer+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/369/449https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/369/449http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/369/449https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/369/449https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/369/449http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/369/449GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/MNRAS/369/449/table2Average flux densities and modulation indices at the four frequencies obtained for each observing session during the long-term monitoring of PKS 0405385recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsDateObservation datetime.epochnullableOL8.6Observation length at 8.6GHzhtime.duration;obs.exposurefloatOL4.8Observation length at 4.8GHzhtime.duration;obs.exposurefloatOL2.4Observation length at 2.4GHzhtime.duration;obs.exposurefloatOL1.4Observation length at 1.4GHzhtime.duration;obs.exposurefloatS8.6Average flux density at 8.6GHzJyphot.flux.density;em.radio.6-12GHzfloatS4.8Average flux density at 4.8GHzJyphot.flux.density;em.radio.3-6GHzfloatS2.4Average flux density at 2.4GHzJyphot.flux.density;em.radio.1500-3000MHzfloatS1.4Average flux density at 1.4GHzJyphot.flux.density;em.radio.750-1500MHzfloatMI8.6Modulation index at 8.6GHzsrc.var.indexfloatMI4.8Modulation index at 4.8GHzsrc.var.indexfloatMI2.4Modulation index at 2.4GHzsrc.var.indexfloatMI1.4Modulation index at 1.4GHzsrc.var.indexfloatJ/MNRAS/369/449/table3*Average linear and circular polarisation obtained during the long-term monitoring of PKS 0405-385recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsDateObservation datetime.epochnullablePolL8.6Linear polarization at 8.6GHzJyphys.polarization.stokesfloatPA8.6[-90/90] Position angle at 8.6GHzdegpos.posAng;phys.polarizationfloatPolL4.8Linear polarization at 4.8GHzJyphys.polarization.stokesfloatPA4.8[-90/90] Position angle at 4.8GHzdegpos.posAng;phys.polarizationfloatPolL2.4Linear polarization at 2.4GHzJyphys.polarization.stokesfloatPA2.4[-90/90] Position angle at 2.4GHzdegpos.posAng;phys.polarizationfloatPolL1.4Linear polarization at 1.4GHzJyphys.polarization.stokesfloatPA1.4[-90/90] Position angle at 1.4GHzdegpos.posAng;phys.polarizationfloatPolC8.6Circular polarization at 8.6GHzJyphys.polarization.stokesfloatPolC4.8Circular polarization at 4.8GHzJyphys.polarization.stokesfloatPolC2.4Circular polarization at 2.4GHzJyphys.polarization.stokesfloatPolC1.4Circular polarization at 1.4GHzJyphys.polarization.stokesfloat