J/ApJ/758/84ivo://CDS.VizieR/J/ApJ/758/84doi:10.26093/cds/vizier.17580084CDSPiner B.G.Pushkarev A.B.Kovalev Y.Y.Marvin C.J.Arenson J.G.,Charlot P.Fey A.L.Collioud A.Voitsik P.A.2021-08-04T08:24:11Z2014-08-07T11:42:50ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-continuum-emissionquasarsbl-lacertae-objectsWe analyze blazar jet apparent speeds and accelerations from the RDV series of astrometric and geodetic very long baseline interferometry (VLBI) experiments. From these experiments, we have produced and analyzed 2753 global VLBI images of 68 sources at 8GHz with a median beam size of 0.9 milliarcseconds (mas) and a median of 43 epochs per source. From this sample, we analyze the motions of 225 jet components in 66 sources. The distribution of the fastest measured apparent speed in each source has a median of 8.3c and a maximum of 44c. Sources in the 2FGL Fermi LAT catalog display higher apparent speeds than those that have not been detected. On average, components farther from the core in a given source have significantly higher apparent speeds than components closer to the core; for example, for a typical source, components at ~3mas from the core (~15pc projected at z~0.5) have apparent speeds about 50% higher than those of components at ~1mas from the core (~5pc projected at z~0.5). We measure accelerations of components in orthogonal directions parallel and perpendicular to their average velocity vector. Parallel accelerations have significantly larger magnitudes than perpendicular accelerations, implying that observed accelerations are predominantly due to changes in the Lorentz factor (bulk or pattern) rather than projection effects from jet bending. Positive parallel accelerations are significantly more common than negative ones, so the Lorentz factor (bulk or pattern) tends to increase on the scales observed here. Observed parallel accelerations correspond to modest source frame increases in the bulk or pattern Lorentz factor.2012ApJ...758...84Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/758/84CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)J/A+A/555/A134 : Variability monitoring of QSO B1156+295 at 4.8GHz (Liu+, 2013)J/A+A/544/A34 : Bright AGN VLBI imaging study at 2 and 8GHz (Pushkarev+, 2012)J/AJ/144/105 : MOJAVE. VIII. Faraday rotation in AGN jets. (Hovatta+, 2012)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/742/27 : 15GHz and jet properties of MOJAVE blazars (Lister+, 2011)J/ApJ/740/98 : Synchroton peak for blazars and radio galaxies (Meyer+, 2011)J/ApJ/722/L7 : Fermi/LAT detected MOJAVE AGNs (Pushkarev+, 2010)J/ApJ/707/L56 : VLBI and bright Fermi/LAT sources (Kovalev, 2009)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/AJ/133/2357 : Pap. I. 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/127/3587 : VLBI ICRF. II (Fey+, 2004)J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004)J/A+A/381/757 : List of extra-galactic radio jets (Liu+, 2002)J/ApJS/128/17 : VLBA obs. of radio reference frame sources. III. (Fey+, 2000)http://rorf.usno.navy.mil/RRFID/ : RRFID VLBA pagehttp://www.obs.u-bordeaux1.fr/BVID/ : The Bordeaux VLBI image databasehttp://astrogeo.org/vlbi_images/ : VLBI image databasehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/758/84https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/758/84http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/758/84https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/758/84https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/758/84http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/758/84GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/758/84/table2 (Sources in the RDV (Research & Development - VLBA) sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/758/84/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/758/84/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/758/84/table2?GETtext/xml+votable180.050000true1.5578869-6.39314860.0055555555555555566/532 556 579 911 2836 3024 4027 4695 5423 5448 5767 5848 6641 6853 7653 9442 9632 9676 9723 10228 10422 11715 12091 12173 13410 13927 16298 17351 17579 18214 18271 18378 18506 18661 19190 21121 21564 21968 22917 23099 23323 24084 24571 24608 25196 25503 25630 27765 28479 29016 29218 29675 31664 31894 34123 34517 35440 38579 38763 40060 42980 43366 43822 44043 44247 46055 47540 480235.300855656246408e-24 5.300855656246408e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/758/84?format=asciiRadiodefaultJ/ApJ/758/84/table2Sources in the RDV (Research & Development - VLBA) samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIERSIAU source name (HHMM+DDd; B1950)meta.id;meta.maincharprimaryf_IERS[efg] Note on source (1)meta.codecharOName? Other source namemeta.idcharNep[20/50] Number of epochs observedmeta.numberintClassSource optical class (2)(3)meta.code.classcharz[0.004/4]? Redshift (2)src.redshiftfloatnullableNcmeta.numberintnullableNgNumber of Gaussian model measures derived for this source (table 3)meta.numberintnullableMOJ[Y ] Presence in MOJAVE? (4)meta.codecharFer[Y ] Presence in Fermi? (5)meta.codecharCatCross-match with MOJAVE (J/AJ/137/3718) et Fermi (2LAC) catalogs within 30"meta.ref.urlintnullableVCatCross-match with Veron+ (Cat. VII/258) within 10"meta.ref.urlintnullablePapIDisplay the data from Paper I (Cat. J/AJ/133/2357) if anymeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/758/84/table3Gaussian modelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIERSIAU Name (HHMM+DDd; B1950)meta.id;meta.maincharS[0.002/19.2] Component flux density at 8GHzJyphot.flux.density;em.radio.6-12GHzfloatRad[0/30] Radial position of component centermaspos.angDistancefloatPA[-180/180] Position angle of component center (1)degpos.posAngfloata[0/14] Full-width at half maximum size of componentmasspect.line.widthfloatb/aAxial ratio of componentphys.angSize;arith.ratiofloatPAa[-90/90] Position angle of major axis of elliptical component (1)degpos.posAngfloatType[0/1] DIFMAP component type (1 = Gaussian)meta.codeintNcNumber of components in this observationmeta.numberintnullableEpoch[1994/2004] Epoch of observationyrtime.epochfloatComp[0/99] Component ID (2)meta.code.multipintNepNumber of observations for this componentmeta.numberintnullableab[0.6/17.1] Beam major axis (3)masphys.angSize;instr.beamfloatbb[0.4/4.5] Beam minor axismasphys.angSize;instr.beamfloatPAb[-90/90] Beam position angledegpos.posAng;instr.beamfloatJ/ApJ/758/84/table5Apparent component speeds from linear fitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIERSIAU Name (HHMM+DDd; B1950)meta.id;meta.maincharComp[1/11] Component IDmeta.code.multipintNcNumber of components for this sourcemeta.numberintnullableNepNumber of observations for this component (table3)meta.numberintnullable<S>[0.006/7.1] Mean flux density at 8GHzJyphot.flux.density;em.radio.6-12GHzfloat<Rad>[0.1/21.4] Weighted mean radial separation from coremasspect.dopplerVeloc;stat.meanfloate_<Rad>[0/0.5] <Rad> uncertaintymasstat.errorfloatmu[-193/2964] Proper motion (in {mu}arcsec/yr)uarcsec/yrpos.pminte_mu[1/1075] mu uncertaintyuarcsec/yrstat.errorintbeta[-16.4/42.6]? Apparent speed {beta} in units of the speed of lightcphys.veloc;arith.difffloatnullablee_beta[0.003/15.5]? beta uncertaintycstat.errorfloatnullablet0? Ejection time is given for proper motions with significance above 3{sigma}yrtime.epochfloatnullablee_t0[0.04/19.6]? t0 uncertaintyyrstat.errorfloatnullable