J/A+A/598/A78ivo://CDS.VizieR/J/A+A/598/A78doi:10.26093/cds/vizier.35980078CDSIntema H.T.Jagannathan P.Mooley K.Frail D.A.2017-03-15T07:18:00Z2017-02-03T07:47:22ZCDS support team

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

cds-question@unistra.frsurveysradio-continuum-emissionWe present the first full release of a survey of the 150MHz radio sky, observed with the Giant Metrewave Radio Telescope (GMRT) between April 2010 and March 2012 as part of the TIFR GMRT Sky Survey (TGSS) project. Aimed at producing a reliable compact source survey, our automated data reduction pipeline efficiently processed more than 2000h of observations with minimal human interaction. Through application of innovative techniques such as image-based flagging, direction-dependent calibration of ionospheric phase errors, correcting for systematic offsets in antenna pointing, and improving the primary beam model, we created good quality images for over 95 percent of the 5336 pointings. Our data release covers 36900deg^2^ (or 3.6{pi}steradians) of the sky between -53{deg} and +90{deg} declination (Dec), which is 90 percent of the total sky. The majority of pointing images have a noise level below 5mJy/beam with an approximate resolution of 25"x25" (or 25"x25"/cos(Dec-19{deg}) for pointings south of 19{deg} declination). We have produced a catalog of 0.62 Million radio sources derived from an initial, high reliability source extraction at the seven sigma level. For the bulk of the survey, the measured overall astrometric accuracy is better than two arcseconds in right ascension and declination, while the flux density accuracy is estimated at approximately ten percent. Within the scope of the TGSS alternative data release (TGSS ADR) project, the source catalog, as well as 5336 mosaic images (5{deg}x5{deg}) and an image cutout service, are made publicly available at the CDS as a service to the astronomical community. Next to enabling a wide range of different scientific investigations, we anticipate that these survey products will provide a solid reference for various new low-frequency radio aperture array telescopes (LOFAR, LWA, MWA, SKA-low), and can play an important role in characterizing the epoch-of-reionisation (EoR) foreground. The TGSS ADR project aims at continuously improving the quality of the survey data products. Near-future improvements include replacement of bright source snapshot images with archival targeted observations, using new observations to fill the holes in sky coverage and replace very poor quality observational data, and an improved flux calibration strategy for less severely affected observational data.2017A&A...598A..78Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/598/A78CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/598/A78https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/598/A78http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/598/A78https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/598/A78https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/598/A78http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/598/A78GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/598/A78/table3 (Full source catalog of TGSS ADR1 150 MHz sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/598/A78/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/598/A78/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/598/A78/table3?GETtext/xml+votable180.050000true4.96617-51.501320.0055555555555555560/0 2 4-6 1/7 12 15 28 30-31 35 39 43 47 2/16-17 20-21 23 27 52-54 56 58-59 116-117 119 135 138-139 151 155 167 171 183 187 3/72-74 88-89 91 96 102-103 105-107 220-222 229 473-474 533-535 537-539 549-551 597-599 601-603 613-615 617-619 660-661 665-667 677-679 682-683 725-727 729-731 741-743 745-747 4/300-302 304-306 309 361-363 389-394 399 402-403 405-407 418-419 895 912-914 922 925-927 1888-1889 1891 1900 1902-1903 2109-2111 2125-2126 2129 2145-2147 2189-2191 2193-2195 2359 2363 2365-2367 2375 2381-2383 2385-2387 2401-2403 2439 2445-2447 2449-2451 2465-2467 2615 2621-2623 2637 2649-2651 2653-2655 2657-2659 2699 2701-2702 2705-2707 2721-2724 2726-2727 2871 2877-2879 2893-2895 2897-2899 2913-2915 2957-2959 2961-2963 2977-2979 5/1212 1214-1215 1232-1233 1235 1244-1245 1248 1258-1259 1277-1279 1441-1443 1552 1554-1555 1581-1583 1585-1586 1588 1590-1593 1595 1600-1601 1603-1604 1606-1607 1617-1619 1664 1666-1669 1671 3568 3570 3573 3575-3576 3578-3579 3660-3661 3663 3680 3687 3693-3695 3697-3699 7560 7562-7563 7604 7606-7607 8413-8415 8429-8431 8433-8435 8477-8479 8493-8495 8497-8499 8508 8511 8513-8515 8520-8522 8524 8527 8577-8579 8733-8735 8749-8751 8753-8755 8769 8771 9457-9459 9499 9517-9519 9521-9523 9537-9539 9601-9603 9751 9767 9773-9775 9777-9779 9793-9795 9857-9859 10477-10479 10481-10483 10525-10527 10541-10543 10545-10547 10552-10554 10557 10559 10593-10595 10610-10611 10625-10627 10781-10783 10801-10803 10812-10814 10817-10819 10881-10883 10900 10902-10903 11483 11495 11501-11503 11505-11507 11549-11551 11565-11567 11569-11571 11585-11587 11649-11651 11805-11807 11821-11823 11825-11827 11841-11843 11905-11907 6/4854 4912-4914 4916-4917 4920 4922 4936 4938 4988-4989 4991 4996-4997 5000-5002 5026-5027 5030 5050 5077 5086-5087 5101-5103 5105 5107 5760-5761 5763 6212 6214-6215 6320 6322 6336-6338 6348-6350 6356 6358-6359 6376-6377 6379 6409-6411 6466-6467 6661-6663 6681-6683 14276-14278 14284-14286 14289 14291 14297 14299 14308 14310 14648 14650 14724-14725 14728 14730-14731 14736 14744 14746 14769-14771 14784-14785 14787 30245-30247 30421-30423 33629 33631 33645-33647 33649-33651 33693-33695 33707 33709-33711 33713-33715 33729-33731 33885-33887 33901-33903 33905-33907 33949-33950 33965-33967 33969-33971 33986-33987 34037-34040 34042-34043 34049-34051 34092 34094-34095 34100-34101 34103-34104 34106-34107 34306-34307 34908-34909 34911 34923 34926-34927 34929-34931 34973-34975 34987 34989-34991 34993-34995 35009-35011 35073 35075 35080-35081 35083 37725-37727 37742-37743 37783 37789-37791 37803 37805-37807 37825-37827 37981-37983 38039 38045-38047 38061-38063 38065-38067 38081-38083 38145-38147 38401-38403 39015 39021-39023 39085-39087 39089-39091 39105-39107 39169-39171 39425-39427 41815 41821-41823 41837-41839 41885-41887 41902-41903 41905-41907 41921-41923 42077-42079 42093-42095 42097-42099 42141-42143 42157-42159 42161 42163 42177-42179 42220-42222 42224-42225 42233 42235 42369-42371 42432-42434 42436-42437 42439 42498-42499 43101-43103 43111 43115 43117-43119 43121-43123 43165-43167 43175 43181-43183 43201-43203 43261-43262 43265-43267 43521-43523 43605-43607 45911 45917 45919 45931 45995 45998-45999 46001-46003 46017-46019 46173-46175 46189-46191 46193-46195 46237-46239 46253-46255 46257-46259 46273-46275 46337-46339 46593-46595 47197-47199 47213-47215 47217-47219 47261-47263 47278-47279 47282-47283 47297-47299 47361-47363 47617-476199.939104750406538e-26 9.939104750406538e-26https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/598/A78?format=asciiRadiodefaultJ/A+A/598/A78/table3Full source catalog of TGSS ADR1 150 MHz sourcesMosaicName of parent mosaic image (4)obs.imagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTGSSADRName without prefix (JHHMMSS.S+DDMMSS) (1)meta.id;meta.maincharRAJ2000Centroid right ascension (J2000)degpos.eq.ra;meta.mainindexede_RAJ2000Uncertainty on right ascension (1 sigma)arcsecstat.error;pos.eq.rafloatDEJ2000Centroid declination (J2000)degpos.eq.dec;meta.mainindexede_DEJ2000Uncertainty on declination (1 sigma)arcsecstat.error;pos.eq.decfloatStotalTotal (integrated) flux density at 150MHzmJyphot.flux.density;em.radio.100-200MHzdoublee_StotalUncertainty on Stotal (1 sigma)mJystat.errordoubleSpeakPeak flux at 150MHzmJy/beamphot.flux.density;em.radio.100-200MHzdoublee_SpeakUncertainty on Speak (1 sigma)mJy/beamstat.errordoubleMajGaussian fit major axisarcsecphys.angSize;meta.modelledfloate_MajUncertainty on Maj (1 sigma)arcsecstat.errorfloatMinGaussian fit minor axisarcsecphys.angSize;srcfloate_MinUncertainty on Min (1 sigma)arcsecstat.error;stat.minfloatPA[] Gaussian fit position angle (2)degpos.posAng;meta.modelledfloate_PAUncertainty on PA (1 sigma)degstat.errorfloatNoiseLocal image background RMS noisemJy/beaminstr.background;obs.image;pos.lgfloatCode[SCM] Source structure code (S/C/M) (3)meta.codechar