J/ApJ/772/13ivo://CDS.VizieR/J/ApJ/772/13doi:10.26093/cds/vizier.17720013CDSLu R.-S.Fish V.L.Akiyama K.Doeleman S.S.Algaba J.C.Bower G.C.,Brinkerink C.Chamberlin R.Crew G.Cappallo R.J.Dexter M.Freund R.,Friberg P.Gurwell M.A.Ho P.T.P.Honma M.Inoue M.Jorstad S.G.,Krichbaum T.P.Loinard L.MacMahon D.Marrone D.P.Marscher A.P.,Moran J.M.Plambeck R.Pradel N.Primiani R.Tilanus R.P.J.Titus M.,Weintroub J.Wright M.Young K.H.Ziurys L.M.2023-07-27T06:38:58Z2015-02-25T12:04:37ZCDS support team

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

cds-question@unistra.frquasarsmillimeter-astronomysubmillimeter-astronomyinterferometryWe report results from five day very long baseline interferometry (VLBI) observations of the well-known quasar 3C 279 at 1.3mm (230GHz) in 2011. The measured nonzero closure phases on triangles including stations in Arizona, California, and Hawaii indicate that the source structure is spatially resolved. We find an unusual inner jet direction at scales of ~1pc extending along the northwest-southeast direction (P.A.=127{deg}+/-3{deg}), as opposed to other (previously) reported measurements on scales of a few parsecs showing inner jet direction extending to the southwest. The 1.3mm structure corresponds closely with that observed in the central region of quasi-simultaneous super-resolution Very Long Baseline Array images at 7mm. The closure phase changed significantly on the last day when compared with the rest of observations, indicating that the inner jet structure may be variable on daily timescales. The observed new direction of the inner jet shows inconsistency with the prediction of a class of jet precession models. Our observations indicate a brightness temperature of ~8x10^10^K in the 1.3mm core, much lower than that at centimeter wavelengths. Observations with better uv coverage and sensitivity in the coming years will allow the discrimination between different structure models and will provide direct images of the inner regions of the jet with 20-30{mu}as (5-7 light months) resolution.2013ApJ...772...13Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/772/13CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/85 : SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009)J/AJ/147/143 : MOJAVE. XI. Spectral distributions (Hovatta+, 2014)J/A+A/566/A59 : 3.5 & 1.3mm polarimetric survey of AGNs (Agudo+, 2014)J/other/Sci/338.355 : 1.3mm VLBI detections of M87 (Doeleman+, 2012)J/AJ/144/105 : MOJAVE. VIII. Faraday rotation in AGN jets. (Hovatta+, 2012)J/ApJ/754/23 : Blazar submm + {gamma}-ray luminosities (Leon-Tavares+, 2012)J/ApJ/747/63 : 7mm VLBA observations of BL Lac object OJ287 (Agudo+, 2012)J/ApJ/727/L36 : 1.3mm VLBI observations of Sagittarius A* (Fish+, 2011)J/MNRAS/418/2260 : VLBI obs. of NRAO 530 at 22, 43 and 86GHz (Lu+, 2011)J/ApJ/710/764 : Extended radio emission in MOJAVE blazars (Kharb+, 2010)J/ApJ/707/L56 : VLBI and bright Fermi/LAT sources (Kovalev, 2009)J/AJ/136/159 : Global 86GHz VLBI survey of compact radio sources (Lee+, 2008)J/AJ/134/799 : Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)J/AJ/133/2866 : 2001-02 opt. variability of blazar 3C 279 (Kartaltepe+, 2007)J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)J/A+A/409/857 : Optical polarization of 3C 279 (Andruchow+, 2003)J/A+A/376/1123 : Bright southern sub-mm sources (Adraou+, 2001)J/A+A/375/661 : Stability of VLBI reference frame (Gontier+, 2001)J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)J/A+AS/122/271 : mm-monitoring of radio sources IV. (Reuter+ 1997)http://www.bu.edu/blazars/VLBAproject.html : Boston University Blazar Grouphttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/772/13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/772/13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/772/13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/772/13https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/772/13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/772/13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap1.528037907652962e-22 1.528037907652962e-22MillimeterdefaultJ/ApJ/772/13/table2Gain-corrected visibility amplitudes of 3C 279Obs[88/94] Observation date (2011-Mar29 to Apr04)stime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinte_Flux[0.03/0.6] The 1{sigma} error in FluxJystat.error;phot.fluxfloatBandBand used: "high" (229.601GHz) or "low" (229.089GHz)instr.bandpasscharCodeBaseline code (G1)instr.setupcharu[-3402/0.05] The u visibility in units of M{lambda}obs.paramdoublev[-1360/344] The v visibility in units of M{lambda}obs.paramdoubleFlux[0.3/13.9] Measured flux density at 1.3mmJyphot.flux.density;em.mm.200-400GHzfloatJ/ApJ/772/13/table3Closure phases of 3C 279recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[88/94] Observation date (2011-Mar29 to Apr04)stime.epoch;obsnullableCodeTriangle code (G1)instr.setupcharCPhase[-175/18] Closure phasedegobs.paramfloate_CPhase[0.7/31] The 1{sigma} error in CPhasedegstat.errorfloatBandBand used: "high" (229.601GHz) or "low" (229.089GHz)instr.bandpasschar