J/A+A/708/A220ivo://CDS.VizieR/J/A+A/708/A220CDSCasadei S.Raiteri C.M.Carnerero M.I.Capetti A.Massaro F.2026-04-08T11:57:21Z2026-04-08T12:56:47ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsradio-galaxiesinfrared-photometryvisible-astronomyWe present a sample of blazar candidates from the Very Large Array Sky Survey (VLASS) catalog, with cross-referencing to optical and infrared data from the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS) and the Wide-Field Infrared Survey Explorer (WISE), respectively. We focus on compact radio sources and employ a multistage selection process to minimize contamination from non-blazar sources. We considered constraints derived from the radio-optical spectral index and from the infrared and optical colors. We identified the variable objects through an optical variability analysis of Pan-STARRS light curves using two reference samples of stars. We further selected sources whose variability exceeds the level observed in quasars. This led to the selection of 3467 candidates with blazar-like properties and strong optical variability. Only 45% is available in other blazar candidate catalogs, with the remainder representing new identifications. In particular, we unveil a large population of faint sources, down to r~20.5. The blazar nature of a subsample of these sources is confirmed by available spectra. Our work offers new insights into the blazar population and serves as a foundation for future variability studies, especially in view of the upcoming Legacy Survey of Space and Time at the Vera C. Rubin Observatory, which will reach even fainter sources.2026A&A...708A.220Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A220CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/708/A220https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/708/A220http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/708/A220https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/708/A220https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/708/A220http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/708/A220GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/708/A220/catalog (BASALT sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/708/A220/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/708/A220/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/708/A220/catalog?GETtext/xml+votable180.050000true191.2670520226547.886532239370.0055555555555555565/8948 6/29 39 56 60 67-68 80 91 98 100 110 112 115 123 128 141 143 152 159 164 166 186 188 217 226 254 260 267 273 276 278 285 298 303-304 357 363 370 372 376 398-400 416 440 465 480 485 509 514 523 543 550 553 566 571 579 583 600 609 624 640 646 648 655 663 676 683 685 691 696 700 704 710 716-718 720 722 755 803 821 851 869 882 928 951 953 961 967-968 973 980 991 1003 1010 1035 1087-1089 1152-1153 1164 1166 1187 1201 1222 1252 1494 1545 1548-1549 1551 1558 1569 1578 1581 1592-1593 1673 1697 1699 1722 1876 1909 1915 2030-2031 2037 2042 2049 2052 2066 2078 2081 2085 2091 2094-2095 2098 2100 2114 2117 2121-2122 2138 2140 2143 2146-2147 2166 2171 2183 2198-2199 2209 2228 2249 2255 2260 2280 2285 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26164 26167 26177 26181 26203 26217 26240 26254 26256 26274 26276-26278 26289 26301 26305 26310 26321-26322 26340 26344 26363 26374-26375 26384 26393 26428 26460 26462-26463 26470 26495 26513-26514 26520 26536 26541 26557 26595-26596 26614 26620 26631 26638 26642 26669 26681 26686 26692 26695 26705 26711 26716 26719 26721 26731 26734 26757 26761 26769 26772 26788 26790 26795 26810 26823-26824 26831 26852 26859 26862 26868 26873 26875 26885 26890 26897-26898 26907 26931 26946-26947 26954 26958 26962 26989 27016 27034 27040 27047 27056 27082 27101 27116 27138 27141 27152 27162 27206 27212 27215 27217 27220 27226 27236 27238 27241 27243 27257 27262 27273-27274 27284 27297 27310-27311 27321-27322 27327 27361 27374 27380 27397 27405 27407 27409 27413 27420 27423 27446 27465-27466 27472 27501 27508 27517 27523 27548 27560 27571 27573 27579 27591 27597 27605 27610 27625 27647 27664 27676 27706 27716 27725 27742 27766 27797-27798 27814 27830-27831 27840 27852 27866 27874 27885 27891 27893 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32514 32517 32522 32537 32540 32545 32550-32551 32556 32559 32600 32607 32610-32611 32619 32641 32650 32656 32660 32677 32679-32680 32701 32703 32712-32713 32729 32738 32749 34637 34647 34653 34674-34675 34708 34740 34744 34767 34779 34784 34794 34796 34813 35675 35700 35702 35734 35739 35763 35767 35772 35783 35787 35790 35798 35801 35805 35807-35808 35825 35833 35963 35987 35998 36014 36019 36022 36024 36038 36043 36047 36051 36059 36063-36064 36071 36090 36100 36108 36110 36117 36129 36136 36140 36144 36154-36155 36158-36160 36168 36176 36183 36188 36196 36203 36206 36222 36227 36237 36268 36276 36282 36301 36319 36350 36354 36382 36387-36388 36391 36401 36419 36440 36443 36459 36463 36471 36491 36496 36498 36509 36519 36523-36525 36527 36540 36549 36551-36552 36588 36602-36603 36607 36614 36640-36641 36678-36679 36691 36706-36707 36719 36731 36735 36738 36781 36807 36814 36845-36846 36858 38654 38719 38764 38846 38864 38871 38880 38882 38888 38895 38899 40062-40063 40156-40157 40171 40193 40204 40209 40211 40214 40219 40223 40228 40235 40247 40254 40258 40265 40274 40281 40284 40293-40294 40303 40308 40331-40332 40335 40337 40343 40346 40349 40366 40376 40379 40382 40393 40397 40405-40406 40411-40412 40418 40421-40422 40437 40518 40534 40538 40548 40559 40661 40667 40671 40703 40755 40763 40766 40786 40789 40792 40805 40814 40818 40827 40838 40865 40874 40885 40889 40896 40898 40917 40925 40947 40953 42863 42874 42919 42926 42930 42948 42974 42980 43866 43870 43884 43887-43889 43891 43897 43900 43950 43973 43976 43986 43990-43991 44011 44022 44135 44146-44147 44211 44215 44241 44255 44265 44276 44280 44288 44291 44313 44358 44365 44368 44378-44379 44389 44426 44439 44449 44462 44477 44484 44495 44507 44533 44543 44551 44567 44575 44582 44585 44613 44622 44624 44646 44658 44661 44669 44674 44679 44700 44712 44714 44728 44734 44745-44746 44766 44769 44774 44780 44783 44791 44803 44805 44809 44815 44820 44859 44863 44869 44894 44901 44908 44910 44913 44921 44927 44951 44976 45002 45010 45013 45016 45021 45053 46932 46960 46962-46963 46969 47003 47016 47031 47046 47057 47065 47080-47081 47087-47088 47095 47098 47995 48100 48106 48120 48123 48223 48231 48237 48245 48248 48250-48251 48298 48325 48327 48333 48341 48352 48387-48388 48390 48398 48407-48408 48418-48419 48421-48422 48439-48440 48446 48449 48463-48464 48467 48476 48479 48483 48505 48519 48555 48571 48580 48582 48590 48595 48605 48624 48629 48637 48641 48647 48650 48654 48671 48673-48674 48676-48677 48683 48685 48693 48712 48714 48749 48754 48782 48795 48798 48801 48823 48858 48862 48872 48906 48913 48922 48931 48938 48985 48995 49015 49022 49028 49037 49039 49049 49062 49071 49076 49091 49100 49108 49134 491453.830199579824256e-20 6.513807192489934e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/708/A220?format=asciiOpticalInfraredRadiodefaultJ/A+A/708/A220/catalogBASALT samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMedianmagMedian synthetic magnitudemagphot.mag;meta.modelleddoubleMADMedian absolute deviation (1)magphot.mag;meta.modelleddoubleCompNameVLASS component namemeta.id;meta.maincharRAJ2000Right Ascension (VLASS) (J2000) (2)degpos.eq.ra;meta.mainDEJ2000Declination (VLASS) (J2000) (2)degpos.eq.dec;meta.maine_RAJ2000Uncertainty on RAdegdegstat.error;pos.eq.radoublee_DEJ2000Uncertainty on DEdegdegstat.error;pos.eq.decdoubleFtotIntegrated radio flux densitymJyphot.flux.density;em.radiodoublee_FtotUncertainty on total fluxmJystat.errordoubleFpeakPeak radio flux densitymJyphot.flux.density;em.radiodoublee_FpeakUncertainty on peak fluxmJystat.errordoubleMajMajor axisarcsecphys.angSizedoublee_MajUncertainty on major axisarcsecstat.errordoubleCitohCompactness factor (Citoh)meta.code;phys.sizedoublegmagPan-STARRS PSF g magnitude (3)magphot.mag;em.opt.Bfloate_gmag? Uncertainty on gmagmagstat.error;phot.magdoublenullablegKmag? Pan-STARRS Kron g magnitude (3)magphot.mag;em.opt.Bfloatnullablee_gKmag? Uncertainty on gKmagmagstat.error;phot.magdoublenullablermagPan-STARRS PSF r magnitude (3)magphot.mag;em.opt.Rfloate_rmag? Uncertainty on rmagmagstat.error;phot.magdoublenullablerKmag? Pan-STARRS Kron r magnitude (3)magphot.mag;em.opt.Rfloatnullablee_rKmag? Uncertainty on rKmagmagstat.error;phot.magdoublenullablealfaRORadio-to-optical spectral indexspect.indexdoubleW1magWISE W1 magnitudemagphot.mag;em.IR.3-4umdoubleW2magWISE W2 magnitudemagphot.mag;em.IR.4-8umdouble