J/ApJ/798/134ivo://CDS.VizieR/J/ApJ/798/134doi:10.26093/cds/vizier.17980134CDSHoman D.C.Lister M.L.Kovalev Y.Y.Pushkarev A.B.Savolainen T.,Kellermann K.I.Richards J.L.Ros E.2025-05-14T20:08:53Z2015-06-30T07:22:41ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-continuum-emissionsurveysquasarsWe report on the acceleration properties of 329 features in 95 blazar jets from the MOJAVE Very Long Baseline Array program. Nearly half the features and three-quarters of the jets show significant changes in speed and/or direction. In general, apparent speed changes are distinctly larger than changes in direction, indicating that changes in the Lorentz factors of jet features dominate the observed speed changes rather than bends along the line of sight. Observed accelerations tend to increase the speed of features near the jet base, <~10-20pc projected, and decrease their speed at longer distances. The range of apparent speeds at a fixed distance in an individual jet can span a factor of a few, indicating that shock properties and geometry may influence the apparent motions; however, we suggest that the broad trend of jet features increasing their speed near the origin is due to an overall acceleration of the jet flow out to deprojected distances of the order of 10^2^pc, beyond which the flow begins to decelerate or remains nearly constant in speed. We estimate intrinsic rates of change of the Lorentz factors in the galaxy frame of the order of {sdot}{Gamma}/{Gamma}~=10^-3^ to 10^-2^/yr, which can lead to total Lorentz factor changes of a factor of a few on the length scales observed here. Finally, we also find evidence for jet collimation at projected distances of <~10pc in the form of the non-radial motion and bending accelerations that tend to better align features with the inner jet.2015ApJ...798..134Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/798/134CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/566/A26 : Jet models for the quasar NRAO150 (Molina+, 2014)J/AJ/146/120 : MOJAVE. X. Parsec-scale kinematics of AGNs (Lister+, 2013)J/ApJ/758/84 : Relativistic jets in the RRFID database (10yr) (Piner+, 2012)J/AJ/144/105 : MOJAVE. VIII. Faraday rotation in AGN jets. (Hovatta+, 2012)J/ApJ/706/1253 : MOJAVE VII. Blazar jet acceleration (Homan+, 2009)J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009)J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)J/A+A/484/119 : Multi-epoch VLBI survey of CJF sources (Britzen+, 2008)J/AJ/133/2357 : Relativistic jets in the RRFID database (Piner+, 2007)J/AJ/130/2473 : Fine-scale structure in 250 sources at 15GHz (Kovalev+, 2005)J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)J/AJ/130/1389 : Linear polarization of AGN jets at 15GHz (Lister+, 2005)J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004)http://www.cv.nrao.edu/MOJAVE/sourcepages : MOJAVE home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/798/134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/798/134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/798/134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/798/134https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/798/134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/798/134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/798/134/blazars (List of blazars (table added by CDS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/798/134/blazars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/798/134/blazars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/798/134/blazars?GETtext/xml+votable180.050000true1.5578869-6.39314860.0055555555555555566/556 911 1263 1509 1546 1701 2721 3024 3309 3675 3820 3886 4285 4695 4770 4820 5693 5767 5817 6252 6984 7389 7570 7896 7969 8031 8299 8717 9442 9460 9633 10163 10422 11715 12047 12352 12580 12619 13496 13693 13927 14641 14744 15023 15067 15286 16027 16093 16298 16301 17184 17351 17857 18506 18661 19088 19101 19398 20099 21358 21768 21935 21968 21972 22363 22396 22658 22917 23099 23121 23323 23416 24084 24571 25302 25630 25864 26131 26292 27310 27417 28083 28479 28492 29570 31430 31559 31664 31894 36785 44247 44908 48595 48846 48965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/798/134?format=asciiRadiodefaultJ/ApJ/798/134/blazarsList of blazars (table added by CDS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOSource identifier (HHMM+DDd; B1950)meta.id;meta.maincharNfNumber of jet features for this blazarmeta.numberintnullableH09meta.codeintnullableL13Display data from Paper X (Lister et al. 2013, J/AJ/146/120)meta.ref.urlcharMOJAVEDisplay the online MOJAVE data for this objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/798/134/table1Jet features for acceleration and non-radial motion analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOSource identifier (HHMM+DDd; B1950)meta.id;meta.maincharSeq[1/48] Component identifiermeta.code.multipintN[10/115] Number of epochsmeta.numberint<R>[0.1/27.2] Mean radial separation from core (averaged over all epochs)masspect.dopplerVeloc;stat.meanfloat<PA>[-178/179] Mean structural position angle (<{theta}>)degpos.posAng;stat.meanfloatdProj[0.1/213] Mean projected radial distance d_proj_pcpos.distance;stat.meanfloatpm[18/2941] Angular proper motion ({mu})uarcsec/yrpos.pminte_pmUncertainty in pmuarcsec/yrstat.errorintbeta[0.1/44] Apparent speed {beta}_obs_=v/cphys.veloc;arith.difffloate_betaUncertainty in betastat.errorfloatphi[-180/180] Proper motion position angle ({phi})degpos.posAng;pos.pmfloate_phiUncertainty in phidegstat.errorfloatDiff[0/180] Absolute difference between mean structural and proper motion PA |{theta}-{phi}|degstat.fit.paramfloate_DiffUncertainty in Diffdegstat.errorfloatdmu[-698/1705] Angular acceleration parallel to the proper motion position angle ({mu}_||_)uarcsec.yr**-2pos.posAnginte_dmuUncertainty in dmuuarcsec.yr**-2stat.errorintdmup[-819/800] Angular acceleration perpendicular tp the proper motion position angle ({mu}_{perp}_)uarcsec.yr**-2pos.posAnginte_dmupUncertainty in dmupuarcsec.yr**-2stat.errorintetaPa[-1.5/1.9] Relative parallel acceleration {eta}_||_ (1)yr**-1stat.fit.paramfloate_etaPaUncertainty in etaPayr**-1stat.errorfloatetaPe[-0.7/1.1] Relative perpendicular acceleration {eta}_{perp}_ (1)yr**-1stat.fit.paramfloate_etaPeUncertainty in etaPeyr**-1stat.errorfloat