J/ApJ/833/288ivo://CDS.VizieR/J/ApJ/833/288doi:10.26093/cds/vizier.18330288CDSTseng C.-Y.Asada K.Nakamura M.Pu H.-Y.Algaba J.-C.Lo W.-P.2017-07-19T06:48:09Z2017-06-06T09:18:38ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinterferometrygalaxiesradio-continuum-emissionThe structure of the NGC 6251 jet on the milliarcsecond scale is investigated using images taken with the European VLBI Network and the Very Long Baseline Array. We detect a structural transition of the jet from a parabolic to a conical shape at a distance of (1-2)x10^5^ times the Schwarzschild radius from the central engine, which is close to the sphere of gravitational influence of the supermassive black hole (SMBH). We also examine the jet pressure profiles with the synchrotron minimum energy assumption to discuss the physical origin of the structural transition. The NGC 6251 jet, together with the M87 jet, suggests a fundamental process of structural transition in the jets of active galactic nuclei (AGNs). Collimated AGN jets are characterized by their external galactic medium, showing that AGN jets interplay with the SMBH and its host galaxy.2016ApJ...833..288Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/833/288CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/152/12 : MOJAVE. XIII. New 15GHz obs. on 1994-2013 (Lister+, 2016)J/ApJ/784/159 : Revisited jet bending in {gamma}-ray AGNs (Graham+, 2014)J/AJ/146/120 : MOJAVE. X. Parsec-scale kinematics of AGNs (Lister+, 2013)J/ApJ/758/84 : Relativistic jets in RRFID database. II. 10yr (Piner+, 2012)J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)J/ApJS/171/376 : MOJAVE. III. VLA 1.4GHz images (Cooper+, 2007)J/AJ/131/1262 : Circular polarization images at 15GHz of AGN jetsJ/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004)J/AJ/126/2268 : Velocity dispersions and Mg2 index of galaxies (Wegner+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/833/288https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/833/288http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/833/288https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/833/288https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/833/288http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/833/288GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/833/288/table2Measurements of the jet radii and estimated uncertaintiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[1/9] Observation Code (1)meta.code;obsintDist[0.6/16500] Deprojected axial distance (z)maspos.angDistancedoubleFWHM[0.5/3094] Fitted Gaussian FWHM of the jet cross section ({phi}_0_)masphys.angSize.smajAxisdoublee_FWHM[0/15]? Fitting uncertainties of FWHMmasstat.error;phys.angSizefloatnullableRad[0.08/1180] Jet radius (r)masphys.angSizedoublee_Rad[0/17]? Fitting uncertainties of Radmasstat.errorfloatnullablee_Radt[0.009/400] Total uncertainties of Rad (2)masstat.errorfloat