J/ApJ/862/151ivo://CDS.VizieR/J/ApJ/862/151doi:10.26093/cds/vizier.18620151CDSHodge M.A.Lister M.L.Aller M.F.Aller H.D.Kovalev Y.Y.,Pushkarev A.B.Savolainen T.2020-02-14T06:12:44Z2019-08-28T10:32:52ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleipolarimetryradio-continuum-emissionredshiftedWe present an analysis of the core linear polarization properties of 387 parsec-scale active galactic nuclei (AGNs) jets. Using 15GHz VLBA data, we revisit the conclusions of the first paper in this series with multiepoch measurements and more detailed analysis of a larger AGN sample that spans a broader range of synchrotron peak frequencies. Each AGN has been observed for at least five epochs between 1996 and 2017. We find that BL Lac objects have core electric vector position angles (EVPAs) that tend toward alignment with the local jet direction; compared to flat spectrum radio quasars, their EVPAs are also less variable over time. The AGN cores that are most fractionally polarized and least variable in polarization have EVPAs that are closely aligned with the local jet direction; they also have low variability in EVPA. These results support the popular model of a standing transverse shock at the base of the jet that collimates the jet magnetic field perpendicular to the jet direction, increasing the fractional polarization and leading to greater polarization stability over time. High-synchrotron-peaked BL Lac objects form a low luminosity, low fractional polarization population. The five narrow line Seyfert 1 galaxies in our sample have low fractional polarization and large EVPA-jet misalignments. Although AGNs detected at {gamma}-rays are thought to be more Doppler boosted than nondetected AGNs, we find no significant differences in fractional polarization based on detection by Fermi-LAT; the {gamma}-loud AGNs are, however, more variable in core EVPAs.2018ApJ...862..151Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/862/151CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/249 : 6dF-DR2 Galaxy Survey (Jones+, 2005)J/AJ/109/1498 : Large Bright Quasar Survey VI (LBQS) (Hewett+, 1995)J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)J/ApJS/121/287 : The CfA2S catalog (Huchra+, 1999)J/ApJ/589/733 : VLBI polarimetry of CJF sources (Pollack+, 2003)J/AJ/130/1389 : Linear polarization of AGN jets at 15GHz (Lister+, 2005)J/ApJ/626/95 : Gamma-ray blazar candidates (Sowards-Emmerd+, 2005)J/A+A/476/L17 : 86 and 43GHz observations of NRAO 150 (Agudo+, 2007)J/ApJ/658/203 : VLBA imaging & polarimetry survey at 5GHz (Helmboldt+, 2007)J/AJ/134/799 : Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)J/ApJ/700/597 : FERMI LAT detected blazars (Abdo+, 2009)J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/742/27 : 15GHz and jet properties of MOJAVE blazars (Lister+, 2011)J/AJ/144/105 : MOJAVE. VIII. Faraday rotation in AGN jets. (Hovatta+, 2012)J/ApJ/744/177 : VLBA 5GHz observations of Fermi/LAT AGNs (Linford+, 2012)J/ApJ/757/25 : Fermi/LAT AGN at 5GHz (Linford+, 2012)J/ApJ/748/49 : Opt. spectroscopy of 1LAC broad-line blazars (Shaw+, 2012)J/AJ/146/120 : MOJAVE. X. Parsec-scale kinematics of AGNs (Lister+, 2013)J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013)J/A+A/566/A59 : 3.5 & 1.3mm polarim. survey of Northern AGNs (Agudo+, 2014)J/MNRAS/442/1693 : Gamma-ray-loud blazars opt. polarization (Pavlidou+, 2014)J/MNRAS/438/3058 : 15GHz variability of {gamma}-ray blazars (Richards+, 2014)J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/ApJ/810/14 : Third catalog of LAT-detected AGNs (3LAC) (Ackermann+, 2015)J/AJ/152/12 : MOJAVE. XIII. New 15GHz obs. on 1994-2013 (Lister+, 2016)J/ApJ/846/98 : Blazar jet kinematics at 43GHz with VLBA (Jorstad+, 2017)J/ApJS/234/12 : MOJAVE XV. VLBA 15GHz obs. 1996-2016 (Lister+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/862/151https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/862/151http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/862/151https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/862/151https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/862/151http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/862/151GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/862/151/agn (General properties of the AGN and derived core quantities (tables 1 and 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/862/151/agn?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/862/151/agn?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/862/151/agn?GETtext/xml+votable180.050000true1.488230838.33754140.0055555555555555566/18 60 514 532 556 579 674 700 893 911 968 1085 1154 1263 1342 1450 1509 1546 1622 1700 1701 1702 1782 2122 2140 2143 2214 2228 2280 2414 2721 2836 3017 3024 3096 3309 3492 3675 3712 3784 3820 3876 3882 3886 3951 4054 4080 4285 4572 4695 4770 4820 4865 4964 5139 5353 5423 5448 5458 5546 5597 5693 5767 5817 5848 6018 6088 6164 6252 6368 6496 6507 6641 6647 6777 6815 6822 6853 6888 6963 6984 6996 7004 7045 7091 7129 7226 7235 7371 7389 7446 7548 7570 7653 7896 7969 8031 8177 8199 8220 8299 8466 8487 8515 8615 8699 8717 8915 9003 9075 9248 9442 9460 9545 9570 9612 9629 9632 9633 9676 9688 9711 9714 9723 9998 10006 10163 10249 10250 10352 10422 10548 10681 10921 11045 11153 11212 11242 11430 11522 11631 11639 11640 11649 11715 11845 12047 12241 12323 12352 12444 12466 12475 12580 12599 12604 12619 12625 13156 13230 13320 13352 13410 13485 13496 13572 13582 13693 13729 13820 13927 14338 14520 14641 14737 14744 14797 14842 14854 15023 15067 15147 15211 15286 15373 15490 15494 15916 15936 15969 16027 16049 16059 16093 16247 16281 16298 16301 16355 16720 17184 17186 17351 17364 17414 17516 17541 17579 17857 17917 17927 18005 18035 18037 18158 18253 18378 18457 18506 18624 18661 18669 18718 19088 19101 19190 19271 19370 19373 19398 19487 19523 19567 19593 19622 19831 19878 20099 20224 20468 20836 20888 20920 20935 21121 21266 21358 21437 21564 21574 21758 21768 21873 21924 21935 21960 21968 21972 22271 22363 22375 22396 22501 22658 22894 22917 22950 23015 23099 23121 23127 23323 23416 23691 23786 23897 24084 24260 24444 24571 24775 24828 24845 25016 25196 25255 25302 25409 25503 25630 25649 25742 25818 25864 26083 26115 26131 26292 26303 26340 26363 26491 26550 26614 26898 26900 26966 27060 27124 27138 27144 27243 27310 27417 27423 27433 27765 28083 28117 28225 28454 28479 28492 28517 29016 29017 29570 29620 29675 29714 29772 30446 31190 31391 31399 31430 31451 31559 31599 31656 31663 31664 31773 31894 31930 32034 32311 32345 32660 32764 34675 35706 35786 36058 36090 36151 36188 36554 36602 38763 40434 40479 40527 40730 40762 40766 40811 40874 40885 42901 42980 44147 44247 44526 44730 44805 44908 46963 46964 48023 48123 48595 48798 48846 48965 49071https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/862/151?format=asciiRadiodefaultJ/ApJ/862/151/table3VLBA 15GHz core measurementsDateUT date of the observationtime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifier (HHMM+DDd; B1950)meta.id;meta.maincharI[0.01/26.5] Stokes I intensityJy/beamphys.polarization.stokesfloatl_mLimit flag on mmeta.code.errorcharm[0.03/14.3] Fractional polarization%phys.polarizationfloatEVPA[-81/270]? Electric vector position angledegpos.posAng;phys.polarizationfloatnullableJetPA[0/360] Inner jet position angle (1)degpos.posAngintf_JetPA[a] Flag on JetPA (2)meta.codecharJ/ApJ/862/151/agnGeneral properties of the AGN and derived core quantities (tables 1 and 4)r_zBibcode reference for z (7)meta.ref;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifier (HHMM+DDd; B1950)meta.id;meta.maincharprimaryAliasSource alias (1)meta.idchar1.5JyMOJAVE 1.5Jy catalog inclusion? (2)meta.codecharLATStatus of Fermi/LAT detection (2)meta.codecharf_LAT[1]? Flag on LAT (3)meta.codeintnullableOClassOptical class (4)meta.code.classcharPClassClass based on synchrotron peak frequency (5)src.classcharlog(nuP)[12/17.1]? log rest frame peak synchrotron frequency (6)log(Hz)phot.flux.density;em.radiofloatnullablez[0.004/3.4]? Spectroscopic redshiftsrc.redshiftdoublenullableNcNumber of core measurements for this AGN (link to Table 3)meta.numberintnullablemMed[0.2/11.6]? Median fractional polarization%phys.polarization;stat.medianfloatnullablel_mMaxLimit flag on mMaxmeta.code.errorcharmMax[0.1/14.3]? Maximum fractional polarization%phys.polarization;stat.maxfloatnullablemVar[0/1]? Fractional polarization variabilitysrc.var.amplitudefloatnullableIMed[0.02/10.5] Median total Stokes I intensityJy/beamphys.polarization.stokesfloatIVar[0/0.7]? Total intensity variabilitysrc.var.amplitudefloatnullableEVPA[2/57]? Electric vector position angle variabilitydegsrc.var.amplitudeintnullableVarPA[2/58]? EVPA variability relative to jet PAdegsrc.var.amplitudeintnullableDiffPA[2/87]? Median difference between EVPA and JetPAdegpos.posAng;arith.diffintnullableSimbadNameSimbad column added by the CDSmeta.idcharNEDNED 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.main