J/A+A/622/A92ivo://CDS.VizieR/J/A+A/622/A92doi:10.26093/cds/vizier.36220092CDSNair D.G.Lobanov A.P.Krichbaum T.P.Ros E.Zensus J.A.Kovalev Y.Y.,Lee S.-SMertens F.Hagiwara Y.Bremer M.Lindqvist M.de Vicente P.2019-03-21T05:24:57Z2019-02-01T07:41:08ZCDS support team

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

cds-question@unistra.frsurveysradio-galaxiesactive-galactic-nucleiquasarsradio-continuum-emissionVery long baseline interferometry (VLBI) observations at 86 GHz (wavelength, {lambda}=3mm) reach a resolution of about 50{mu}as, probing the collimation and acceleration regions of relativistic outflows in active galactic nuclei (AGN). The physical conditions in these regions can be studied by performing 86GHz VLBI surveys of representative samples of compact extragalactic radio sources. To extend the statistical studies of compact extragalactic jets, a large global 86GHz VLBI survey of 162 compact radio sources was conducted in 2010-2011 using the Global Millimeter VLBI Array (GMVA). The survey observations were made in a snapshot mode, with up to five scans per target spread over a range of hour angles in order to optimize the visibility coverage. The survey data attained a typical baseline sensitivity of 0.1Jy and a typical image sensitivity of 5mJy/beam, providing successful detections and images for all of the survey targets. For 138 objects, the survey provides the first ever VLBI images made at 86GHz. Gaussian model fitting of the visibility data was applied to represent the structure of the observed sources and to estimate the flux densities and sizes of distinct emitting regions (components) in their jets. These estimates were used for calculating the brightness temperature (Tb) at the jet base (core) and in one or more moving regions (jet components) downstream from the core. These model-fit-based estimates of Tb were compared to the estimates of brightness temperature limits made directly from the visibility data, demonstrating a good agreement between the two methods. The apparent brightness temperature estimates for the jet cores in our sample range from 2.5x10^9^K to 1.3x10^12^K, with the mean value of 1.8x10^11^K. The apparent brightness temperature estimates for the inner jet components in our sample range from 7.0x10^7^K to 4.0x10^11^K. A simple population model with a single intrinsic value of brightness temperature, T0, is applied to reproduce the observed distribution. It yields T0=(3.77^+0.10^_0.14_)10^11^K for the jet cores, implying that the inverse Compton losses dominate the emission. In the nearest jet components, T0=(1.42^+0.16^_0.19_)10^11^K is found, which is slightly higher than the equipartition limit of 5x10^10^K expected for these jet regions. For objects with sufficient structural detail detected, the adiabatic energy losses are shown to dominate the observed changes of brightness temperature along the jet.2019A&A...622A..92Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/622/A92CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/622/A92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/622/A92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/622/A92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/622/A92https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/622/A92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/622/A92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/622/A92/table5 (List of sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A92/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A92/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A92/table5?GETtext/xml+votable180.050000true3.3797091708340.860317786110.005555555555555556Cone search capability for table J/A+A/622/A92/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A92/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A92/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A92/list?GETtext/xml+votable180.050000true3.3797140.860320.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/622/A926/438 804 968 991 1210 1225 1342 1509 1701-1702 1727 1782 2053 2143 2214 2280 2531 2721 2836 2867 3024 3283 3492 3506 3712 3761 3767 3794 4027 4572 4695 5139 5163 5212 5353 5448 5458 5546-5547 5597-5598 5658 5674 5767 5806 5817 5848 5870 6164 6252 6406 6448 6496 6548 6821-6822 6984 6996 7119 7129 7336 7426 7446 7587 7758 7808 7896 7911 8031 8057 8077 8187 9284 9328 9460 9618 9632-9633 9636 9720 9805 9899 9906 9976 9998 10170 10228 10249 10321 10336 10422 10435 10548 10986 11006 11067 11118 11164 11260 11640 12166 12173 12239 12619 12635 12640 12844 12851 12881 12896 13273 13352-13353 13496 13585 13693 13769 13792 13927 14150 14581 14605 14618 14637 14641 14797 14820 14842 15036 15377 15429 15834 15916 15935-15936 16027 16056-16057 16254 16261 16272 16298 19436 19952 20099 20304 23882 23897 23899 24346 24415 26131 26292 28083 28299 30701 30705 32160 32247 32660 32687 327645.698419830464889e-23 5.764680526167968e-23https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/622/A92?format=asciiRadiodefaultJ/A+A/622/A92/table5List of sourcesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceIAU source name, J2000 (JHHMM+DDMM)meta.id;meta.maincharBNameIAU source name, B1950 (HHMM+DDd)meta.idcharNameCommon namemeta.idcharEpObserving epoch(s) (G1)time.epochcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainz? Redshiftsrc.redshiftfloatnullableTypeOptical class (2)src.classcharVmag? V magnitudemagphot.mag;em.opt.VfloatnullableJ/A+A/622/A92/table6Image parameterse_SL? rms uncertainty on SLstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceIAU source name, J2000 (JHHMM+DDMM)meta.id;meta.maincharEpObserving epoch (G1)time.epochcharS86GHz? Total single dish flux density at 86GHz (1)Jyphot.flux.density;em.mm.50-100GHzfloatnullableSS? Correlated flux densities measured on projected baseline length listed in BSJystat.correlation;phot.flux.densityfloatnullablee_SS? rms uncertainty on SSJystat.errorfloatnullableBS? Projected baseline lengthinstr.baselineintnullableSL? Correlated flux densities measured on projected baseline length listed in BLstat.correlation;phot.flux.densityfloatnullableBL? Projected baseline lengthinstr.baselineintnullableBaMajor axis of the restoring beamuarcsecphys.angSize;instr.beamintBbMinor axis of the restoring beamuarcsecphys.angSize;instr.beamintBPAPosition angle of the restoring beamdegpos.posAng;instr.beamfloatStTotal clean flux densitymJyphot.flux.density;em.mm.50-100GHzintSpPeak flux densitymJy/beamphot.flux.density;em.mm.50-100GHzintsigmaOff-source rms noise in the residual imagemJy/beamstat.fit.residual;instr.det.noise;obs.imageintQualQuality factor of the residual noise in the imageinstr.det.noisefloatJ/A+A/622/A92/table7Model fit parametersl_dLimit flag on dmeta.code.errorchard? Component sizeuarcsecphys.angSizeintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceIAU source name, J2000 (JHHMM+DDMM)meta.id;meta.maincharEpObserving epoch (G1)time.epochcharCompID number of Gaussian model fit componentmeta.code.multipintStotTotal flux density at 87GHz of the componentmJyphot.flux.density;em.mm.50-100GHzinte_Stotrms uncertainty on StotmJystat.errorintSpeakPeak flux density at 87GHz of the componentmJy/beamphot.flux.density;em.mm.50-100GHzinte_Speakrms uncertainty on SpeakmJy/beamstat.errorinte_d? rms uncertainty on duarcsecstat.errorintnullabler? Component's offset from the coreuarcsecpos;arith.diffintnullablee_r? rms uncertainty on ruarcsecstat.errorintnullabletheta? Position angle of the offsetdegpos.posAng;arith.difffloatnullablee_theta? rms uncertainty on thetadegstat.error;pos.posAngfloatnullablel_TbLimit flag on Tbmeta.code.errorcharTbBrightness temperature obtained from the model fits1e+10Kphys.temperaturefloate_Tb? rms uncertainty on Tb1e+10Kstat.errorfloatnullableTbmin? Visibility based estimate of the minimum brightness temperature1e+10Kphys.temperature;stat.minfloatnullableTbmax? Visibility based estimate of the maximum resolved brightness temperature1e+10Kphys.temperature;stat.maxdoublenullableJ/A+A/622/A92/listList of fits filesFreqObserved frequencyHzem.freqdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceIAU source name, J2000 (JHHMM+DDMM)meta.id;meta.maincharEp[ABC] Observing epoch (G1)time.epochcharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axis for image (FileName1)meta.numberintNyNumber of pixels along Y-axis for image (FileName1)meta.numberintObs.dateObservation datetime.epoch;obsnullablesize1Size of FITS file for image (FileName1)Kibytephys.size;meta.fitsintFileName1Name of FITS file for image, in the subdirectory imagesmeta.id;meta.fitscharTitle1Title of the FITS file for image (FileName1)meta.notecharsize2Size of FITS file for visibility (FineName2)Kibytephys.size;meta.fitsintFileName2Name of FITS file for visibility, in the subdirectory visibmeta.id;meta.fitscharTitle2Title of the FITS file for visibility (FileName2)meta.notecharAssocDataAssociated Data web pagemeta.ref.urlchar