J/A+A/544/A34ivo://CDS.VizieR/J/A+A/544/A34doi:10.26093/cds/vizier.35440034CDSPushkarev A.B.Kovalev Y.Y.2017-06-21T08:21:56Z2012-07-27T09:57:42ZCDS support team

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

cds-question@unistra.frradio-galaxiesinterferometryvery-long-baseline-interferometryWe investigate statistical and individual astrophysical properties of active galactic nuclei (AGNs), such as parsec-scale flux density, core dominance, angular and linear sizes, maximum observed brightness temperatures of VLBI core components, spectral index distributions for core and jet components, and evolution of brightness temperature along the jets. Furthermore, we statistically compare core flux densities and brightness temperature as well as jet spectral indices of {gamma}-ray bright and weak sources. We used 19 very long baseline interferometry (VLBI) observing sessions carried out simultaneously at 2.3GHz and 8.6GHz with the participation of 10 Very Long Baseline Array (VLBA) stations and up to 10 additional geodetic telescopes. The observations span the period 1998-2003. We present here single-epoch results from high-resolution radio observations of 370 AGNs. Our VLBI images at 2.3GHz and 8.6GHz as well as Gaussian models are presented and analyzed. At least one-fourth of the cores are completely unresolved on the longest baselines of the global VLBI observations. The VLBI core components are partially opaque with the median value of spectral index of alpha_core_~0.3, while the jet features are usually optically thin alpha_jet_~-0.7. The spectral index typically decreases along the jet ridge line owing to the spectral aging, with a median value of -0.05mas^-1^. Brightness temperatures are found to be affected by Doppler boosting and reach up to ~10^13^K with a median of ~2.5x10^11^K at both frequencies. The brightness temperature gradients along the jets typically follow a power law T_b_~r^-2.2^ at both frequencies. We find that 147 sources (40%) positionally associated with gamma-ray detections from the Fermi LAT Second Source Catalog have higher core flux densities and brightness temperatures, and are characterized by the less steep radio spectrum of the optically thin jet emission.2012A&A...544A..34Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/544/A34CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/544/A34https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/544/A34http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/544/A34https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/544/A34https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/544/A34http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/544/A34GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/544/A34/sources (Parameters of the observed sources and of the VLBI maps, and core properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/544/A34/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/544/A34/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/544/A34/sources?GETtext/xml+votable180.050000true1.55788703333-6.393148697220.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/544/A346/60 180 198 304 307 375 421 438 532 556 579 700 839 911 1032 1085 1200 1233 1263 1546 1702 1782 2124 2143 2158 2631 2836 3024 3044 3057 3316 3675 3820 4027 4436 4448 4572 4627 4685 4695-4696 4770 4820 4866 4964 4992 5163 5371 5423 5448 5546 5693 5767 5817 5848 6033 6164 6167 6252 6448 6507 6532 6641 6824 6853 6996 7148 7181 7296 7346 7351 7371 7472 7570 7606 7623 7653 7745 7851 7857 7896 8031 8057 8123 8199 8299 8345 8487 8615 8805 8858 8905 8915 8948 9016 9125 9142 9204 9232 9442 9460 9512 9545 9588 9632 9676 9711 9723 9813 10006 10163 10228 10249 10321 10422 10432 10435 10501 10511 10519 10524 10561 10598 10798 10803 10983 11027 11094 11206 11216 11279 11430 11461 11639 11715 11845 11880 12091 12173 12241 12301 12352 12475 12580 12599 12971 12987 13156 13230 13352 13410 13496 13545 13693 13722 13789 13927 14150 14348 14455 14634 14842 15036 15286 15536 15819 15936 16027 16049 16059 16185 16281 16298 16301-16302 16592 17019 17110 17184 17215 17351 17414 17516 17541 17579 17672-17673 17698 17703 17712 17717 17725 17734 17791 17857 18002 18022 18035 18037 18214 18271 18378 18506 18624 18661 18669 19088 19190 19271 19370 19398 19523 19609 19629 19831 20144 20657 20935 21121 21266 21358 21437 21508 21564 21758 21924 21935 21960 21968 21972 22375 22396 22501 22658-22659 22917 22943 22950 22965 23014 23022 23099 23323 23333 23335 23383 23416 23761 23805 23882 24084 24099 24123 24335 24349 24571 24608 24845 25196 25255 25302 25428 25493 25503 25630 25742 25864 25990 26000 26115 26301 26303 26550 26966 26983 27060 27220 27310 27322 27466 27514 27583 27765 27909 28167 28249 28339 28383 28454 28479 28492 28517 28628 29016 29218 29570 29675 29714 29795 29963 30527 31176 31190 31211 31334 31451 31529 31535 31559 31664 31857 31894 32311 32325 32594 32660 32764 34123 34210 34264 34517 34571 34675 35440 35786 36155 36188 36554 36785 38579 38763 40060 40344 40692 40730 42883 42901 42980 43366 43399 43822 43936 44034 44043 44247 44614 44661 44776 44805 44832 44899 45011 46055 46588 46851 46964 47014 47540 47941 48023 48589 48595 48610 48798 489651.5239959695752804e-24 5.6984200832293834e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/544/A34?format=asciiRadiodefaultJ/A+A/544/A34/table6Source models (models = same "Name, Date, Freq")recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (JHHMM+DDMM, J2000)meta.id;meta.maincharDateDate of observationtime.epochnullableFreq[2.3/8.6] Frequency of observationGHzem.freq;obsfloatSFitted Gaussian flux densitymJyphot.flux.density;em.radiointrPosition offset from the core componentmaspos.angDistancefloatphiPosition angle of component with respect to the core componentdegpos.posAngfloatMajFWHM major axis of fitted Gaussianmasphys.angSize;meta.modelledfloatRatioaxial ratio of fitted Gaussianphys.size.axisRatiofloatPA[-172/172] Major axis position angle of fitted Gaussiandegpos.posAng;meta.modelledfloatJ/A+A/544/A34/sourcesParameters of the observed sources and of the VLBI maps, and core propertiesSDownload the S-band (2.3GHz) imagemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (JHHMM+DDMM, J2000)meta.id;meta.maincharprimaryIVSSource name (HHMM+DDd, B1950) or usual namemeta.idcharRAJ2000Right Ascension J2000 (1)pos.eq.ra;meta.mainDEJ2000Declination J2000 (1)pos.eq.dec;meta.maincl[QBGU] Optical classification, as Quasar, BL Lac, Galaxy or Unindentifiedsrc.classcharz? Redshiftsrc.redshiftfloatnullablescale? Angular scaling conversionpc/masarith.factorfloatnullable2FGL? Fermi LAT detection flag (2)meta.codecharSmapName of the fits file with 2.3GHz map in subdirectory imagesmeta.idcharXmapName of the fits file with 8.6GHz map in subdirectory imagesmeta.id;meta.filecharXDownload the X-band (8.6GHz) imagemeta.ref.urlcharSpeakPeak flux density in 2.3GHz image (in Jy/beam)Jyphot.flux.density;em.radio.1500-3000MHzfloatSlevBottom level contour in 2.3GHz imagemJyinstr.backgroundfloatStotTotal flux density from 2.3GHz mapJyphot.flux.density;em.radio.1500-3000MHzfloatSun? Flux density from the most compact (unresolved) component on 2.3GHz mapJyphot.flux.density;em.radio.1500-3000MHzfloatnullableSbminFWHM minor axis of restoring beam at 2.3GHzmasphys.angSize;em.radio.1500-3000MHz;instr.beamfloatSbmajFWHM major axis of restoring beam at 2.3GHzmasphys.angSize;em.radio.1500-3000MHz;instr.beamfloatSbpaPosition angle of major axis of restoring beam at 2.3GHzdegpos.posAngintXpeakPeak flux density in 8.6GHz image (in Jy/beam)Jyphot.flux.density;em.radio.6-12GHzfloatXlevBottom level contour in 8.6GHz imagemJyinstr.backgroundfloatXtotTotal flux density from 8.6GHz mapJyphot.flux.density;em.radio.6-12GHzfloatXun? Flux density from the most compact (unresolved) component on 8.6GHz mapJyphot.flux.density;em.radio.6-12GHzfloatnullableXbminFWHM minor axis of restoring beam at 8.6GHzmasphys.angSize;em.radio.6-12GHz;instr.beamfloatXbmajFWHM major axis of restoring beam at 8.6GHzmasphys.angSize;em.radio.6-12GHz;instr.beamfloatXbpaPosition angle of major axis of restoring beam at 8.6GHzdegpos.posAngintEpochDate of observationtime.epochnullableScoreFitted Gaussian core flux density at 2.3GHzJyphot.flux.density;em.radiofloatSfmajFWHM major axis of the fitted core Gaussian at 2.3GHzmasphys.angSize;em.radio.1500-3000MHz;meta.modelledfloatl_SfminLimit flag on Sfmin (upper limit) (1)meta.code.errorcharSfminFWHM minor axis of the fitted core Gaussian at 2.3GHzmasphys.angSize;em.radio.1500-3000MHz;meta.modelledfloatl_STbLimit flag on STb (lower limit) (2)meta.code.errorcharSTbCore brightness temperature at 2.3GHzKphys.temperaturedoubleXcoreFitted Gaussian core flux density at 8.6GHzJyphot.flux.density;em.radio.6-12GHzfloatXfmajFWHM major axis of the fitted core Gaussian at 8.6GHzmasphys.angSize;em.radio.6-12GHz;meta.modelledfloatl_XfminLimit flag on Xfmin (upper limit) (1)meta.code.errorcharXfminFWHM minor axis of the fitted core Gaussian at 8.6GHzmasphys.angSize;em.radio.6-12GHz;meta.modelledfloatl_XTbLimit flag on XTb (lower limit) (2)meta.code.errorcharXTbCore brightness temperature at 8.6GHzKphys.temperaturedouble