J/AJ/147/14ivo://CDS.VizieR/J/AJ/147/14doi:10.26093/cds/vizier.51470014CDSDeller A.T.Middelberg E.2017-06-13T11:08:51Z2015-01-27T14:47:52ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesinterferometryWe present the description and early results of the mJy Imaging VLBA Exploration at 20cm (mJIVE-20). mJIVE-20 is a large project on the Very Long Baseline Array which is systematically inspecting a large sample of mJy radio sources, pre-selected from the Faint Images of the Radio Sky at Twenty cm (FIRST) survey made with the Very Large Array, to identify any compact emission that may be present. The survey is being undertaken using filler time on the VLBA, which utilizes short segments scheduled in bad weather and/or with a reduced number of antennas, during which no highly rated science projects can be scheduled. The newly available multifield capability of the VLBA makes it possible for us to inspect of the order of 100 sources per hour of observing time with a 6.75{sigma} detection sensitivity of approximately 1mJy/beam. The results of the mJIVE-20 survey are made publicly available as soon as the data are calibrated. After 18 months of observing, over 20000 FIRST sources have been inspected, with 4336 very long baseline interferometry detections. These initial results suggest that within the range 1-200mJy, fainter sources are somewhat more likely to be dominated by a very compact component than brighter sources. Over half of all arcsecond-scale mJy radio sources contain a compact component, although the fraction of sources that are dominated by milliarcsecond scale structure (where the majority of the arcsecond scale flux is recovered in the mJIVE-20 image) is smaller at around 30%-35%, increasing toward lower flux densities. Significant differences are seen depending on the optical classification of the source. Radio sources with a stellar/point-like counterpart in the Sloan Digital Sky Survey (SDSS) are more likely to be detected overall, but this detection likelihood appears to be independent of the arcsecond-scale radio flux density. The trend toward higher radio compactness for fainter sources is confined to sources that are not detected in SDSS or that have counterparts classified as galaxies. These results are consistent with a unification model of active galactic nuclei in which less luminous sources have on average slower radio jets, with lower Doppler suppression of compact core emission over a wider range of viewing angles.2014AJ....147...14Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/147/14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/A+A/551/A97 : Lockman Hole/XMM VLBI observations (Middelberg+, 2013)J/ApJ/742/49 : Variable and transient radio sources in FIRSTJ/A+A/520/A113 : VLBI detection of 398 extragalactic radio sourcesJ/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)J/ApJ/658/203 : VLBA imaging and polarimetry survey at 5GHz (Helmboldt+, 2007)J/AJ/127/2565 : Faint FIRST variable radio sources (De Vries+, 2004)J/AJ/125/465 : Phoenix Deep Survey 1.4-GHz microJy Catalog (Hopkins+, 2003)J/ApJS/141/13 : VLBA calibrator survey: VCS1 catalog (Beasley+, 2002)http://safe.nrao.edu/vlba/mjivs : mJIVE-20http://astrogeo.org/rfc : Radio fundamental cataloghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/147/14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/147/14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/147/14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/147/14https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/147/14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/147/14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/147/14/catalog (mJIVE-20 catalog (20-31 Dec 2013))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/14/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/14/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/14/catalog?GETtext/xml+votable180.050000true3.6404125-0.222511110.0055555555555555565/1205 1212 1290 1343 1364 1383 1399 1508 1562 1563 1617 1650 1658 1660 1847 2121 2131 2153 2207 2214 2237 2250 2268 2308 2365 2404 2453 2476 2489 2534 2649 2745 2752 2779 2794 2857 4454 4501 4508 4509 4521 4529 4693 4797 4880 6514 6575 6577 6585 6590 6611 6725 6736 6783 6855 6859 6880 6949 6981 7013 7078 7095 7111 7115 7129 7849 7883 11252 6/4112 4113 4352 4353 4373 4387 4392 4393 4443 4444 4446 4447 4471 4477 4566 4569 4572 4573 4583 4589 4594 4600 4679 4685 4690 4693 4695 4696 4698 4798 4799 4817 4819 4825 4828 4839 4866 4867 4872 4873 4923 4985 4987 4988 4990 4995 4998 5001 5004 5008 5009 5012 5137 5139 5140 5142 5152 5154 5189 5191 5200 5202 5270 5271 5276 5277 5293 5295 5304 5306 5309 5345 5346 5347 5348 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19329 19332 19333 19334 19524 19593 19595 19596 19598 23210 25549 25551 25560 25562 25805 25807 25816 25817 25818 25936 25937 25987 25990 25991 25993 25996 25997 26003 26006 26009 26012 26050 26081 26083 26084 26086 26118 26119 26124 26125 26249 26251 26254 26276 26295 26346 26542 26543 26547 26548 26550 26554 26556 26611 26612 26614 26615 26875 26878 26887 26893 26898 26904 26981 26983 26994 27085 27096 27098 27203 27206 27209 27212 27217 27220 27289 27291 27292 27294 27322 27323 27401 27403 27404 27406 27415 27417 27419 27433 27435 27458 27464 27466 27487 27509 27526 27562 27563 27581 27582 27583 27593 27595 27596 27598 27626 27669 27765 27767 27793 27855 27866 27883 27886 27888 27891 27896 27897 27908 27909 27923 27936 27938 27999 28051 28137 28139 28140 28142 28166 28167 28170 28172 28173 28175 28186 28192 28197 28205 28207 28208 28215 28216 28218 28225 28228 28256 28258 28262 28264 28265 28268 28269 28270 28337 28338 28339 28345 28368 28370 28371 28376 28377 28443 28449 28451 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Error in DPA linked to additional data for VLBI detections (including contour plots and calibrated UV data)degstat.error;pos.posAngfloatnullableC[C] C = Complex flag (1)meta.codecharSDSSData from the SDSS-DR9 photometric catalog within 8''meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVSimbad column added by the CDSmeta.ref.urlcharMJV[0/24478] The mJIVE-20 numbermeta.id;meta.mainintprimaryRAJ2000FIRST Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000FIRST Degree of Declination (J2000)pos.eq.dec;meta.mainFpkFIRST peak flux density (in mJy/beam)mJyphot.flux.densityfloatFintFIRST integrated flux densitymJyphot.flux.densityfloatFIRSTData from the version 12 of the FIRST survey catalog within 1.5''meta.ref.urlcharBMajVLBI synthesized beam major axismasphys.angSize;instr.beamfloatBMinVLBI synthesized beam minor axismasphys.angSize;instr.beamfloatBPAVLBI synthesized beam position angledegpos.posAng;instr.beamfloatl_VpkLimit flag on Vpkmeta.code.errorcharVpkVLBI peak flux density (in mJy/beam)mJyphot.flux.densityfloate_Vpk? Error in VpkmJystat.errorfloatnullableRAV? VLBI Hour of Right Ascension (J2000)pos.eq.ranullablee_RAV? Error in RAVssstat.errordoublenullableDEV? VLBI Degree of Declination (J2000)pos.eq.decnullablee_DEV? Error in DEVsarcsecstat.errordoublenullableV/Fpk? Ratio of VLBI to FIRST peak flux densitiesphot.flux;arith.ratiofloatnullableVint? VLBI integrated flux densitymJyphot.flux.densityfloatnullablee_Vint? Error in VintmJystat.errorfloatnullableV/Fint? Ratio of VLBI integrated flux density to FIRST peak flux densityphot.flux;arith.ratiofloatnullableDMaj? VLBI single-gaussian deconvolved major axismasphys.angSizefloatnullablee_DMaj? Error in DMajmasstat.errorfloatnullableDMin? VLBI single-gaussian deconvolved minor axismasphys.angSize;srcfloatnullablee_DMin? Error in DMinmasstat.errorfloatnullableDPA? VLBI single-gaussian deconvolved position angledegpos.posAngfloatnullableJ/AJ/147/14/variablesKnown , or discovered variable sourcerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_MJVSimbad column added by the CDSmeta.codecharMJV[1591/22015] The mJIVE-20 numbermeta.id;meta.mainintFIRSTThe FIRST identifier (JHHMMSS.sss+DDMMSS.ss)meta.idcharFpkFIRST peak flux density (in mJy/beam)mJyphot.flux.densityfloatl_Vpk[<] Upper limit flag on Vpkmeta.code.errorcharVpkVLBI peak flux density (in mJy/beam)mJyphot.flux.densityfloatl_V/Fpk[<] Upper limit flag on Vpk/Fpkmeta.code.error;pos.cartesian.ycharV/FpkRatio of VLBI to FIRST peak flux densitiesphot.flux;arith.ratiofloat