J/A+A/667/A39ivo://CDS.VizieR/J/A+A/667/A39doi:10.26093/cds/vizier.36670039CDSKutkin A.M.Oosterloo T.A.Morganti R.Adams E.A.K.Mancini M.,Adebahr B.de Blok W.J.G.Denes H.Hess K.M.van der Hulst J.M.,Lucero D.M.Moss V.A.Berger A.van den Brink R.van Cappellen W.A.,Connor L.Damstra S.Loose G.M.van Leeuwen J.Maan Y.Mika A.,Norden M.J.Offringa A.R.Oostrum L.C.van der Schuur D.Vohl D.,Wijnholds S.J.Ziemke J.2024-11-06T20:01:12Z2022-11-04T09:41:00ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesgalaxy-classification-systemsThe first data release of Apertif survey contains 3074 radio continuum images covering a thousand square degrees of the sky. The observations were performed during August 2019 to July 2020. The continuum images were produced at a central frequency 1355MHz with the bandwidth of ~150MHz and angular resolution reaching 10''. In this work we introduce and apply a new method to obtain a primary beam model using a machine learning approach, Gaussian process regression. The primary beam models obtained with this method are published along with the data products for the first Apertif data release. We apply the method to the continuum images, mosaic them and extract the source catalog. The catalog contains 249672 radio sources many of which are detected for the first time at these frequencies. We cross-match the coordinates with the NVSS, LOFAR/DR1/value-added and LOFAR/DR2 catalogs resulting in 44523, 22825 and 152824 common sources respectively. The first sample provides a unique opportunity to detect long term transient sources which have significantly changed their flux density for the last 25 years. The second and the third ones combined together provide information about spectral properties of the sources as well as the redshift estimates.2022A&A...667A..39Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/667/A39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/659/A1 : LOFAR Two-metre Sky Survey (LoTSS) DR2 (Shimwell+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/667/A39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/667/A39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/667/A39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/667/A39https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/667/A39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/667/A39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/667/A39/table1 (Continuum source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/667/A39/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/667/A39/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/667/A39/table1?GETtext/xml+votable180.050000true20.4633739336832931.1941785133486180.0055555555555555563/214 4/135 141 146-147 149 382 646-647 649-650 656 658 692 701 707 709-710 715 736-738 843 845-847 850-851 865 868-869 871 880-882 5/255 419-420 425-429 535 539 579 581-583 594-595 600 602-603 608 612-613 624 768-770 1484 1486-1487 1502 1508-1509 1515 1518-1519 1521-1524 1857 1859-1862 1868 1872 2283 2285-2286 2290 2296 2495 2531-2532 2534 2536-2538 2575 2583 2595 2604 2606-2607 2609 2612 2628 2684 2686-2689 2691-2692 2759 2772-2774 2778-2780 2782-2783 2800-2801 2823 2835 2844 2853-2855 2857-2859 2864 2866 2872 2874 2880 2960 2976 3351 3353 3355-3358 3367 3371 3377-3379 3392 3394-3396 3398 3416 3418 3440 3442-3443 3445-3446 3448 3450 3452 3454 3457 3459 3465 3468-3469 3471 3480-3481 3483 3505 3507-3509 3532 3536 5095 5099-5102 7039 6/1015 1019 1671 1675 1684 1686-1690 1692-1693 1697-1698 1720-1722 2137-2139 2149-2151 2153 2155 2199 2205 2242 2245 2248 2253 2255 2288-2289 2292 2307 2310 2313-2315 2321 2323 2369-2372 2374-2375 2404-2405 2407 2416-2417 2420-2421 2436 2440 2460-2461 2500-2502 2504-2505 2508 3084 3104 5933 5935 5940 5942 5978 5989 5991 5995 5997-6000 6002-6003 6021 6023 6029 6031 6040-6042 6044 6047 6053-6055 6057 6059 6064 6066-6069 6071 6081 6083 6104 6106 6128 6130 6136 7427 7452-7454 7461 7476 7492 9119 9125-9127 9129-9131 9136 9138-9139 9148-9149 9151 9164 9166 9188 9190 9192-9194 9973 9975 9979 10117-10119 10121 10123 10156 10160 10293-10295 10297-10299 10314-10315 10318-10319 10325-10327 10329-10331 10373-10375 10377 10379 10420-10422 10432-10433 10440 10442 10445 10452-10454 10456-10458 10464 10472 10516 10518 10520-10521 10546 10552 10624-10625 10627-10628 10715 10717-10719 10727 10733 10735 10740-10742 10760-10761 10763 10772-10774 10776-10778 10788-10789 11031 11061 11100-11101 11103-11105 11109-11111 11124-11126 11157-11159 11164 11213 11215 11291 11335 11337-11339 11380-11382 11384-11386 11400 11402-11404 11406-11409 11427 11460-11462 11468 11470-11471 11492 11494 11500 11502 11528-11530 11824 11826 11832 11848 11908 13385 13387 13390-13391 13398-13399 13401-13403 13409 13411 13417-13419 13436-13437 13439 13459 13462-13463 13465-13467 13477-13479 13481 13483 13504-13505 13507 13573-13575 13588-13590 13598-13599 13670 13676 13678 13764 13766 13778-13779 13788-13790 13797 13807 13812 13814-13815 13820 13822 13827 13880-13881 13883 14040 14132 14136 14152 14160 14208-14210 20375 20377-20379 20389-20391 20393 20395 20412 20414-20415 20418 20424 20426 20448 28150-28151 28153 28155 28501-28503 28508-285099.939104750406538e-26 8.9783243941496e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/667/A39?format=asciiOpticalRadiodefaultJ/A+A/667/A39/table1Continuum source catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLoTSSindicates sources in LOFAR-DR2meta.ref.urlcharApertifApertif source name (APTF_JHHMMSS+DDMMSS)meta.id;meta.maincharprimaryRAICRS[20.46/358.82] Right ascension (ICRS, J2000)degpos.eq.ra;meta.mainindexedDCPA[-90/90] Deconvolved position angle of the source (measured relative to the north celestial pole, turning positive into the direction of the right ascension) (1)degpos.posAngdoublee_DCPA[0.03/90.0]? Deconvolved position angle error or CDPA upper limit if DCPA=0degstat.errordoublenullablee_RAICRS[0.32/12.58] Right ascension errorarcsecstat.error;pos.eq.radoubleDEICRS[27.46/62.34] Declination (ICRS, J2000)degpos.eq.dec;meta.mainindexede_DEICRS[0.21/29.55] Declination errorarcsecstat.error;pos.eq.decdoubleSint[0.09/2555.64] 1355MHz Total flux densitymJyphot.flux.density;em.radio.750-1500MHzdoublee_Sint[0.03/129.58] 1355MHz Total flux density errormJystat.errordoubleSpeak[0.08/2101.62] 1355MHz Peak flux densitymJy/beamphot.flux.density;em.radio.750-1500MHzdoublee_Speak[0.01/105.17] 1355MHz Peak flux density errormJy/beamstat.errordoubleDCmajDeconvolved major source size (1)arcsecphys.angSizedoublee_DCmaj[0.0/122.63] Deconvolved major source size error or DCmaj upper limit if DCmaj=0arcsecstat.errordoubleDCminDeconvolved minor source size (1)arcsecphys.angSizedoublee_DCmin[0.0/28.07] Deconvolved minor source size error or DCmin upper limit if DCmin=0arcsecstat.errordoubleIslrms[0.01/6.91] local background noise RMSuJy/beaminstr.background;pos.lg;pos.lsrdoubleSCode[SCM] Source type as classified by PyBDSF (2)meta.codecharJ/A+A/667/A39/table3Common Apertif and LOFAR sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintApertifApertif source name (APTF_JHHMMSS+DDMMSS)meta.id;meta.maincharLOFARLOFAR source name (ILTJHHMMSS.ss+DDMMSS.s)meta.idcharSpeakA[0.09/2101.62] Apertif 1335MHz peak flux densitymJy/beamphot.flux.density;em.radio.750-1500MHzdoubleSpeakL[0.04/7017.09] Lofar 150MHz peak flux densitymJy/beamphot.flux.density;em.radio.100-200MHzdoubleSintA[0.1/2555.64] Apertif 1335MHz total flux densitymJyphot.flux.density;em.radio.750-1500MHzdoubleSintL[0.21/15694.12] Lofar 150MHz total flux densitymJyphot.flux.density;em.radio.100-200MHzdoubleSI[-2.85/2.41] Spectral indexspect.indexdoubleSep[0.0/10.0] Angular separationarcsecpos.angDistancedoublezbest[-0.01/6.61]? Redshift estimate from Lofar value-added catalogsrc.redshift;pos.heliocentricdoublenullable