J/ApJS/255/30ivo://CDS.VizieR/J/ApJS/255/30doi:10.26093/cds/vizier.22550030CDSGordon Y.A.Boyce M.M.O'Dea C.P.Rudnick L.Andernach H.,Vantyghem A.N.Baum S.A.Bui J.-P.Dionyssiou M.Safi-Harb S.Sander I.2022-02-09T14:56:38Z2021-08-18T08:26:04ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesThe Very Large Array Sky Survey (VLASS) is observing the entire sky north of -40{deg} in the S-band (2-4GHz), with the highest angular resolution (2.5") of any all-sky radio continuum survey to date. VLASS will cover its entire footprint over three distinct epochs, the first of which has now been observed in full. Based on Quick Look images from this first epoch, we have created a catalog of 1.9x10^6 reliably detected radio components. Due to the limitations of the Quick Look images, component flux densities are underestimated by ~15% at S>3mJy/beam and are often unreliable for fainter components. We use this catalog to perform statistical analyses of the 3GHz radio sky. Comparisons with the Faint Images of the Radio Sky at Twenty cm survey (FIRST) show the typical 1.4-3GHz spectral index to be -0.71. The radio color-color distribution of point and extended components is explored by matching with FIRST and the LOFAR Two Meter Sky Survey. We present the VLASS source counts, dN/dS, which are found to be consistent with previous observations at 1.4 and 3GHz. Resolution improvements over FIRST result in excess power in the VLASS two-point correlation function at angular scales <7", and in 18% of active galactic nuclei associated with a single FIRST component being split into multi-component sources by VLASS.2021ApJS..255...30Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/255/30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/255/30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/255/30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/255/30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/255/30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/255/30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/255/30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/255/30/comp (Detected components and properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/255/30/comp?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/255/30/comp?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/255/30/comp?GETtext/xml+votable180.050000true0.0001767680.012667450.005555555555555556Cone search capability for table J/ApJS/255/30/subtile (Subtile metadata)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/255/30/subtile?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/255/30/subtile?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/255/30/subtile?GETtext/xml+votable180.050000true32.460612098271.17157619120.0055555555555555560/0-3 1/17-19 21-23 25-27 29-31 39 43 2/65-67 81-83 96 98-99 112 114-115 141-143 151 155 167 189-191 3/258-259 321-323 388 390-391 452-453 455 541-543 557-559 561-563 599 603 667 679 685-687 733-735 749-751 753-755 4/1025-1030 1281-1283 1556-1557 1559 1816 1818-1819 2141-2143 2157-2159 2161-2163 2205-2207 2221-2223 2225-2227 2241-2243 2391 2395 2407 2411 2455 2459 2461-2463 2471 2477-2479 2647 2651 2653-2655 2663 2667 2711 2715 2727 2733-2735 2737-2739 2909-2911 2925-2927 2929-2931 2973-2975 2987 2989-2991 2993-2995 3009-3011 5/4097-4099 4124-4126 5121-5123 6232-6233 6235 7269-7271 8541-8543 8557-8559 8561-8563 8605-8607 8621-8623 8625-8627 8641-8643 8797-8799 8813-8815 8817-8819 8861-8863 8877-8879 8881-8883 8897-8899 8961-8963 9470 9529-9530 9533 9535 9542 9547-9550 9559-9560 9563 9568 9570-9571 9573 9576 9579 9607 9612 9615 9617 9619-9621 9623-9624 9626-9627 9633 9636 9639 9643 9807 9813-9814 9817 9834-9835 9841-9843 9879 9883 9901-9903 9905-9907 10494 10559 10583 10587 10599 10601 10603 10609-10611 10631 10635 10641 10643 10645 10647-10648 10650-10651 10660 10663 10665 10667 10799 10803 10807-10808 10811-10812 10815 10824 10827 10830 10832 10839-10840 10842 10851-10852 10855-10857 10883-10884 10889-10890 10893 10895-10896 10899-10900 10904-10905 10907 10914-10916 10921 10923 10925-10927 10929-10931 10945-10947 11613-11615 11629-11631 11633-11635 11677-11679 11693-11695 11697-11699 11713-11715 11869-11871 11885-11887 11889-11891 11933-11935 11943 11947 11953-11955 11969-11971 12033-12035 6/16385-16387 16508 16510-16511 20481-20483 24937-24939 29073-29075 34141-34143 34157-34159 34161-34163 34205-34207 34221-34223 34225-34227 34241-34243 34397-34399 34413-34415 34417-34419 34461-34463 34477-34479 34481-34483 34497-34499 34561-34563 35165-35167 35181-35183 35185-35187 35229-35231 35245-35247 35249-35251 35265-35267 35421-35423 35437-35439 35441-35443 35485-35487 35501-35503 35505-35507 35521-35523 35585-35587 35841-35843 37847 37853-37855 37873-37874 37877-37879 37884-37885 37887 38012-38014 38093 38095 38097-38101 38103-38104 38106-38109 38111 38115 38124 38126-38128 38131 38136-38137 38139 38151 38156 38158-38162 38165-38167 38172-38173 38175 38177-38182 38184 38186-38187 38204-38205 38207-38210 38212 38214-38215 38217-38222 38224-38226 38231-38232 38234-38235 38245-38247 38249-38251 38276-38277 38279 38289-38291 38296 38298-38299 38301-38303 38308 38311-38312 38314-38315 38421-38423 38425 38427 38438-38439 38443-38445 38447 38452-38454 38457 38459 38464-38466 38472-38473 38475 38488 38491 38500 38502-38503 38528 38531 38536-38538 38541-38543 38548 38551-38552 38554-38555 38561-38566 38568 38571 39223 39227 39237-39239 39241 39243-39245 39247-39248 39251 39261-39264 39266-39267 39272-39274 39277-39279 39309-39310 39313-39315 39317-39322 39325-39327 39329 39331 39333-39335 39361-39363 39509-39511 39513 39515 39527 39581-39583 39597-39599 39601-39603 39617-39619 41855 41915 41917-41918 41934-41935 41939-41940 41943-41944 41946-41949 41951 41953-41954 41957-41959 41961-41964 41967-41968 41971-41974 41980-41982 42207 42219-42220 42223 42227-42229 42231-42232 42235 42295 42298-42299 42301-42303 42315 42317-42319 42322-42324 42327-42328 42330-42331 42336 42339-42341 42343-42344 42346-42347 42371 42373-42376 42379-42381 42383-42384 42386 42389-42392 42394-42395 42400 42402-42403 42408-42409 42411 42432 42434-42435 42519 42522-42523 42533-42534 42537-42539 42545-42550 42553-42555 42557-42560 42563 42568-42569 42571 42576 42578-42579 42585-42587 42596 42598-42599 42624-42626 42629-42634 42637-42639 42645-42649 42651 42657-42659 42665-42667 43127 43131-43133 43135 43191 43195 43207 43211 43216-43218 43221-43223 43225-43227 43237-43240 43243 43252 43255-43256 43258-43259 43277-43279 43281-43286 43288-43290 43293-43295 43300-43302 43304-43305 43307 43313-43318 43325-43327 43332-43334 43336-43338 43341-43343 43345-43347 43349 43352 43354-43355 43364-43366 43373-43375 43392 43396 43398-43401 43403 43412-43413 43415-43416 43419 43432-43434 43437-43439 43527 43531 43540-43542 43544-43546 43548-43550 43552-43553 43555 43564-43566 43569-43570 43577-43579 43588 43591 43593-43595 43604-43606 43608-43610 43613-43615 43624-43626 43648-43650 43653-43655 43668-43670 43672-43674 43677-43682 43689-43691 43697-43699 43713-43715 43777-43779 46429-46431 46445-46447 46449-46451 46493-46495 46509-46511 46513-46515 46529-46531 46685-46687 46701-46703 46705-46707 46749-46751 46765-46767 46769-46771 46785-46787 46849-46851 47453-47455 47469-47471 47473-47475 47517-47519 47533-47535 47537-47539 47553-47555 47709-47711 47725-47727 47729-47731 47767 47771 47779 47781-47784 47786-47787 47809-47811 47873-47875 48129-481312.650427828123204e-24 2.650427828123204e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/255/30?format=asciiRadiodefaultJ/ApJS/255/30/compDetected components and propertiesTileVLASS tile (Tile) (5)obs.fieldcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCompId[-588/218] The PyBDSF ID of the component in the subtile (Component) (2)meta.idintIslId[0/624] The PyBDSF ID of the flux island in the subtile (Isl_id) (2)meta.idintRAJ2000[0.0/360.0] Right Ascension (J2000) (RA)degpos.eq.ra;meta.mainindexedDEJ2000[-40.02/89.83] Declination (J2000) (DEC)degpos.eq.dec;meta.mainindexede_RAJ2000? 1-sigma uncertainty in RA (E_RA) (3)degstat.error;pos.eq.radoublenullablee_DEJ2000? 1-sigma uncertainty in DEC (E_DEC) (3)degstat.error;pos.eq.decdoublenullableFtotThe integrated flux density of the component in the S-band (2-4GHz) (Total_flux) (3)mJyphot.flux.density;em.radio.1500-3000MHzdoublee_Ftot1-sigma uncertainty in total flux (E_Total_f) (3)mJystat.errorfloatFpeakPeak brightness of the component in the S-band (2-4GHz) (Peak_flux) (3)mJy/beamphot.flux.density;em.radio.1500-3000MHzdoublee_Fpeak1-sigma uncertainty in peak flux (E_Peak_fl) (3)mJy/beamstat.errorfloatMaj? Major axis of the component fit (Maj) (3)arcsecstat.fit.param;meta.modelleddoublenullablee_Maj? 1-sigma uncertainty in Maj (E_Maj) (3)arcsecstat.errordoublenullableMin? Minor axis of the component fit (Min) (3)arcsecphys.angSize;srcdoublenullablee_Min? 1-sigma uncertainty in Min (E_Min) (3)arcsecstat.error;stat.mindoublenullablePA? Position angle of the component fit (PA) (3)degpos.posAng;meta.modelleddoublenullablee_PA? 1-sigma uncertainty in PA (E_PA) (3)degstat.errordoublenullableFtotIslIntegrated flux density of the entire flux island (Isl_Total)mJyphot.flux.density;em.radio.1500-3000MHzdoublee_FtotIsl1-sigma uncertainty in FtotIsl (E_Isl_Tot)mJystat.errorfloatIslrmsLocal rms noise of the flux island (Isl_rms)mJy/beamstat.stdev;phot.flux.densityfloatIslmeanMean value of the flux island (Isl_mean)mJy/beamphot.flux.density;stat.meanfloatResIdIslrmsLocal rms noise of the residual for the flux island (Resid_Isl) (3)mJy/beamstat.fit.residual;phot.flux.densityfloatResidIslmeanMean value of the residual for the flux island (Resid_Isl) (3)mJy/beaminstr.det.noisedoubleRAMdegRight Ascension (J2000) of the component peak brightness (RA_max)degpos.eq.raDEMdegDeclination (J2000) of the component peak brightness (DEC_max)degpos.eq.dece_RAMdeg? 1-sigma uncertainty in RAMdeg (E_RA_max) (3)degstat.errordoublenullablee_DEMdeg? 1-sigma uncertainty in DEMdeg (E_DEC_max) (3)degstat.errordoublenullableXposnX-pixel coordinate of the component in the subtile (Xposn)pixpos.cartesian.x;instr.detdoublee_Xposn? 1-sigma uncertainty in Xposn (E_Xposn) (3)pixstat.error;pos.cartesian.xdoublenullableYposnY-pixel coordinate of the component in the subtile (Yposn)pixpos.cartesian.y;instr.detdoublee_Yposn? 1-sigma uncertainty in Yposn (E_Yposn) (3)pixstat.error;pos.cartesian.ydoublenullableXposnMaxX-pixel coordinate of the component peak brightness in the subtile (Xposn_max)pixpos.cartesian.x;instr.detdoublee_XposnMax? 1-sigma uncertainty in Xposn_max (E_Xposn_m) (3)pixstat.error;pos.cartesian.xdoublenullableYposnMaxY-pixel coordinate of the component peak brightness in the subtile (Yposn_max)pixpos.cartesian.y;instr.detdoublee_YposnMax? 1-sigma uncertainty in Yposn_max (E_Yposn_m) (3)pixstat.error;pos.cartesian.ydoublenullableMajImgPlane? Major axis of the component fit in the image plane (Maj_img_p) (3)arcsecphys.angSizedoublenullablee_MajImgPlane? 1-sigma uncertainty in Maj_img_plane (E_Maj_img) (3)arcsecstat.errordoublenullableMinImgPlane? Minor axis of the component fit in the image plane (Min_img_p)arcsecphys.angSize;srcdoublenullablee_MinImgPlane? 1-sigma uncertainty in Min_img_plane (E_Min_img) (3)arcsecstat.errordoublenullablePAImgPlane? Position angle of the component fit in the image plane (PA_img_pl) (3)degpos.posAng;meta.modelleddoublenullablee_PAImgPlane? 1-sigma uncertainty in PA_img_plane (E_PA_img_) (3)degstat.errordoublenullableDCMaj? Major axis of the component fit after deconvolution from the VLASS beam (DC_Maj) (3)arcsecphys.angSizedoublenullablee_DCMaj? 1-sigma uncertainty in DC_Maj (E_DC_Maj) (3)arcsecstat.errordoublenullableDCMin? Minor axis of the component fit after deconvolution from the VLASS beam (DC_Min) (3)arcsecphys.angSize;srcdoublenullablee_DCMin? 1-sigma uncertainty in DC_Min (E_DC_Min) (3)arcsecstat.errordoublenullableDCPA? Position angle of the component fit after deconvolution from the VLASS beam (DC_PA) (3)degpos.posAng;meta.modelleddoublenullablee_DCPA? 1-sigma uncertainty in DC_PA (E_DC_PA) (3)degstat.errordoublenullableDCMajImgPlane? Major axis of the component fit in the image plane after deconvolution from the VLASS beam (DC_Maj_im) (3)arcsecphys.angSizedoublenullablee_DCMajImgPlane? 1-sigma uncertainty in DC_Maj_img_plane (E_DC_Maj_) (3)arcsecstat.errordoublenullableDCMinImgPlane? Minor axis of the component fit in the image plane after deconvolution from the VLASS beam (DC_Min_im) (3)arcsecphys.angSize;srcdoublenullablee_DCMinImgPlane? 1-sigma uncertainty in DC_Min_img_plane (E_DC_Min_) (3)arcsecstat.errordoublenullableDCPAImgPlane? Position angle of the component fit in the image plane after deconvolution from the VLASS beam (DC_PA_img) (3)degpos.posAng;meta.modelleddoublenullablee_DCPAImgPlane? 1-sigma uncertainty in DC_PA_img_plane (E_DC_PA_i)degstat.errordoublenullableRASdegRight Ascension (J2000) of the Subtile (QL_image_)degpos.eq.raDESdegDeclination (J2000) of the Subtile (QL_image_)degpos.eq.decNVSSdistAngular separation from the nearest NVSS source (NVSS_dist) (6)arcsecpos.angDistancedoubleFIRSTdistAngular separation from the nearest FIRST source (FIRST_dis) (7)arcsecpos.angDistancedoublePeakToRing? Ratio of maximum brightness within 5" of the component to the maximum brightness in an annulus centred on the component with inner and outer radii of 5" and 10" (Peak_to_r) (8)phot.flux;arith.ratiodoublenullableDupFlag[0/2] Flag to identify duplicate detections (Duplicate) (9)meta.codeintQualFlag[0/7] Flag to denote the Quality of the detection (Quality_f) (10)meta.code.qualintNNdist? Angular separation from nearest other fitted component in the catalog after accounting for duplicates (NN_dist) (3)arcsecpos.angDistancedoublenullableBMajMajor axis of the VLASS beam (BMAJ)arcsecphys.angSizefloatBMinMinor axis of the VLASS beam (BMIN)arcsecphys.angSize;srcfloatBPA[-90/90]? Position angle of the VLASS beam (BPA)degpos.posAng;instr.beamintnullableMainSample[0/1] Part of the main sample used for the scientific analyses presented in the paper (main_samp) (11)meta.codeintCompNameIAU name of the component, VLASS1QLCIR JHHMMSS.ss+DDMMSS.s (Component) (1)meta.id;meta.maincharSCode[SCME] Component type (S_Code) (4)meta.codecharSubtileName of the Subtile the component was detected in (Subtile)obs.fieldcharQLcutoutLink to a 3 arcminute square cutout of the component (QL_cutout)meta.ref.urlcharJ/ApJS/255/30/subtileSubtile metadata_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintImagever[1/5] Version of the image produced by NRAO (Image_version)meta.softwareintEpochThe epoch and sub-epoch of VLASS this Subtile is taken from (Epoch)time.epochfloatBmajMajor axis of the VLASS beam in this subtile (BMAJ)degphys.angSize;instr.beamdoubleBminMinor axis of the VLASS beam in this subtile (BMIN)degphys.angSize;instr.beamdoubleBPA[-90/90] Position angle of the VLASS beam in this subtile (BPA)degpos.posAng;instr.beamdoubleLatPoleLatitude of pole in coordinate system (LATPOLE)pos.ecliptic.latfloatLonPoleLongitude of pole in coordinate system (LONPOLE)pos.ecliptic.lonfloatCrval1Reference pixel Right Ascension (CRVAL1)deginstr.fov;instr.pixelfloatCrval2Reference pixel Declination (CRVAL2)deginstr.fov;instr.pixelfloatObsDate and time of observation (DATE-OBS)stime.epoch;obsnullableindexedRAObsObservation Right Ascension, at epoch Obs.date (OBSRA)degpos.eq.ra;meta.mainindexedDEObsObservation Declination, at epoch Obs.date (OBSDEC)degpos.eq.dec;meta.mainindexedFieldNRAO name of VLASS field (FIELD)meta.id;obs.fieldintMeanIslrmsMean Isl_rms of components in this subtile (Mean_isl_rms)mJy/beamstat.errorfloatSDIslrmsStandard deviation of the Isl_rms of components in this subtile (SD_isl_rms)mJy/beamstat.errorfloatFp2525th percentile of the Peak_flux distribution for components in this subtile (Peak_flux_p25)mJy/beamphot.flux.density;em.radio.1500-3000MHzfloatFp5050th percentile of the Peak_flux distribution for components in this subtile (Peak_flux_p50)mJy/beamphot.flux.density;em.radio.1500-3000MHzfloatFp7575th percentile of the Peak_flux distribution for components in this subtile (Peak_flux_p75)mJy/beamphot.flux.density;em.radio.1500-3000MHzfloatFpmaxPeak flux of the brightest component in this subtile (Peak_flux_max)mJy/beamphot.flux.density;em.radio.1500-3000MHzdoubleNcomp[11/219] Number of fitted components in this subtile (N_components)meta.numberintNemptyIsl[10/218] Number of empty flux islands detected in this subtile (N_empty_islands) (3)meta.numberintSubtileName of the Quick Look image, JHHMMSS+DDMMSS (Subtile)obs.fieldcharTileThe VLASS tile that this subtile is taken from (Tile) (1)obs.fieldcharDateImgDate that the image file was produced (DATE) (2)time.epochcharOriginSoftware (CASA) and version used to produce the image file (ORIGIN)meta.softwarecharSubtileurlLink to the Subtile image file (Subtile_url)meta.ref.urlchar