J/A+A/630/A56ivo://CDS.VizieR/J/A+A/630/A56doi:10.26093/cds/vizier.36300056CDSPatino-Alvarez V.M.Dzib S.A.Lobanov A.Chavushyan V.2019-09-23T08:03:53Z2019-09-23T08:42:22ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleigamma-ray-astronomyinterferometryradio-sourcesWe investigate the relationship between the variable gamma-ray emission and jet properties in the blazar 3C 279, by combining the Fermi/LAT data spanning a period of eight years with concurrent radio measurements made at multiple epochs with VLBA at 15 and 43 GHz within the MOJAVE and VLBA-BU monitoring programs. The aim of this paper is to compare the flux variability of the different components found in the VLBA observations, to the variability in the gamma-rays. This analysis helps to investigate whether any of the jet components can be associated with the gamma-ray variability. Through Spearman rank correlation we found that the gamma-ray variability is correlated with a particular region (feature B, in the MOJAVE images) downstream from the observed base (core) of the jet. This jet component is therefore a likely location at which an important fraction of the variable gamma-ray emission is produced. We also calculated the average proper motion of the component with respect to the VLBA core and found that it moves at an apparent superluminal velocity of (3.70+/-0.35)c, implying that one of the gamma-ray emission zones is not stationary. This jet component is also found between 6.86mas and 8.68mas, which translates to a distance from the radio core of at least 42pc.2019A&A...630A..56Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/630/A56CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/409/857 : Optical polarization of 3C 279 (Andruchow+, 2003)J/AJ/133/2866 : 2001-02 optical variability of blazar 3C279 (Kartaltepe+, 2007)J/ApJ/772/13 : VLBI observations of 3C 279 at 230GHz (Lu+, 2013)J/A+A/590/A10 : 3C 279 optical photometry and polarimetry (Kiehlmann+, 2016)J/AJ/151/54 : VRIJHK photometry of 3C 279 (Sandrinelli+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/630/A56https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/630/A56http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/630/A56https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/630/A56https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/630/A56http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/630/A56GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayRadiodefaultJ/A+A/630/A56/table2VLBA fluxes for the feature B of 3C 279 in the MOJAVE maps, along with the simultaneous gamma-ray fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian day of the VLBA observationdtime.epoch;obsintFgammaGamma-ray fluxph.cm**-2.s**-1phot.flux.density;em.gamma.harddoublee_FgammaError in gamma-ray fluxph.cm**-2.s**-1stat.errordoubleFVLBAIntegrated fluxmJyphot.flux.density;em.radiofloate_FVLBAError in integrated flux (random error only)mJystat.errorfloatJ/A+A/630/A56/table3VLBA fluxes for the 43GHz core of 3C 279 in the BU-VLBA maps, along with the simultaneous gamma-ray fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian day of the VLBA observationdtime.epoch;obsintFgammaGamma-ray fluxph.cm**-2.s**-1phot.flux.density;em.gamma.harddoublee_FgammaError in gamma-ray fluxph.cm**-2.s**-1stat.errordoubleFVLBAIntegrated fluxmJyphot.flux.density;em.radiofloate_FVLBAError in integrated flux (random error only)mJystat.errorfloatJ/A+A/630/A56/table4VLBA fluxes for the ejection C31 of 3C 279 in the BU-VLBA maps, along with the simultaneous gamma-ray fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian day of the VLBA observationdtime.epoch;obsintFgammaGamma-ray fluxph.cm**-2.s**-1phot.flux.density;em.gamma.harddoublee_FgammaError in gamma-ray fluxph.cm**-2.s**-1stat.errordoubleFVLBAIntegrated fluxmJyphot.flux.density;em.radiofloate_FVLBAError in integrated flux (random error only)mJystat.errorfloatJ/A+A/630/A56/table1VLBA fluxes for the 15GHz core of 3C 279 in the MOJAVE maps, along with the simultaneous gamma-ray fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian day of the VLBA observationdtime.epoch;obsintFgammaGamma-ray fluxph.cm**-2.s**-1phot.flux.density;em.gamma.harddoublee_FgammaError in gamma-ray fluxph.cm**-2.s**-1stat.errordoubleFVLBAIntegrated fluxmJyphot.flux.density;em.radiofloate_FVLBAError in integrated flux (random error only)mJystat.errorfloat