ivo://astron.nl/lotss_dr3/q/mosaicsASTRONShimwell, T. W.Hardcastle, M. J.Tasse, C.Drabent, A.Botteon, A.Williams, W. L.Best, P.N.Röttgering, H. J. A.Brüggen, M.Brunetti, G.Callingham, J. R.Chyży, K. T.Conway, J. E.De Gasperin, F.Haverkorn, M.Horellou, C.Jackson, N.Miley, G. K.Morabito, L. K.Morganti, R.O'Sullivan, S. P.Schwarz, D. J.Smith, D. J. B.van Weeren, R. J.Vedantham, H. K.White, G. J.Ahmadi, A.Alegre, L.Arias, M.Asabere, B.Bahr-Kalus, B.Barkus, B.Bilicki, M.Böhme, L.Brentjens, M.Brienza, M.Bomans, D. J.Bonafede, A.Bonato, M.Bonnassieux, E.Boxelaar, J. M.Camera, S.Cassano, R.Chilufya, J.Cianfaglione, M.Croston, J. H.Cuciti, V.Dabhade, P.De Rubeis, E.de Jong, J. M. G. H. J.Dallacasa, D.Dettmar, R. J.Duncan, K. J.Di Gennaro, G.Edler, H. W.Groeneveld, C.Gürkan, G.Hajduk, M.Hale, C. L.Heesen, V.Hoang, D. N.Hoeft, M.Holties, H.Horton, M. A.Iacobelli, M.Jamrozy, M.Jarvis, M. J.Jelic, V.Kadler, M.Kondapally, R.Kunert-Bajraszewska, M.Loose, M.Magliocchetti, M.Małek, K.Manzano, C.McKean, J. P.Mevius, M.Mingo, B.Miskolczi, A.Misra, A.Moldón, J.Nair, D.G.Nakoneczny, S. J.Orru, E.Pashapour-Ahmadabadi, M.Pasini, T.Petley, J.Pierce, J. C. S.Prandoni, I.Rafferty, D.Rajpurohit, K.Riseley, C.J.Roberts, I. D.Sethi, S.Shulevski, A.Stein, M.Stuardi, C.Sweijen, F.ter Veen, S.Timmerman, R.Vaccari, M.Wijnholds, S.https://repository.surfsara.nl/api/objects/collection/lotss-dr3/thumbnail2026-02-22T22:56:09Michael Sipior

Oude Hoogeveensedijk 4, 7991PD Dwingeloo, the Netherlands

vo@astron.nlradio continuum: general, techniques: image processing In this data release from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 88% of the northern sky. The individual pointing images (at 6'' and 20'' resolution) were derived from 12,950 hrs (18.6 PB) of LOFAR High Band Antenna data which were processed through fully automated direction-independent and direction-dependent calibration pipelines that correct for instrumental effects as well as spatially and temporally varying ionospheric distortions. The Stokes I images were then combined, accounting for the rms noise level and telescope beam, to form the final Stokes I mosaic images at 6'' and 20'' resolution, with a central frequency of 144MHz. From the 6'' resolution Stokes mosaics we derived a catalogue of 13,664,379 radio sources (consisting of 16,943,656 Gaussian components), the majority of which have never been detected at radio wavelengths before. These mosaics have a median rms sensitivity of 92 μJy/beam; a random and systematic flux density scale accuracy of approximately 6% and 2%, respectively; an astrometric accuracy of 0.24''; and we estimate that we detect more than 95% of sources with integrated flux densities exceeding nine times the local root mean square noise. To enable thorough scientific exploitation of this unique dataset, we have published two sub-collections. The first contains all the Stokes I mosaic products described above. The second contains the individual pointing products, including calibrated uv data (measurement sets and direction-dependent calibration solutions) to allow for re-imaging or post-processing; Stokes I images at 6' ' and 20'' resolution (with associated scaling factors required to reproduce the mosaic images); Stokes V images at 6'' resolution for each observing epoch; and Stokes Q and U image cubes at 20'' and 4' resolution.Shimwell et al. 2026https://vo.astron.nl/tableinfo/lotss_dr3.mosaicsSurveyResearchLOFARLOFAR.HBA6/660,664,670,676,680,686,690,703,712,719,723,735,739,750,755,899,914,932,936,940,945,958,2050,2063,2067,2078,2083,2094,2098,2109,2114,2125,2129,2142,2145,2158,2162,2167,2178,2189,2193,2199,2203,2209,2215,2219,2236,2252,2257,2268,2272,2284,2288,2293,2298,2306,2311,2315,2325,2331,2343,2346,2358,2378,2405,2408,2437,2441,2447,2452,2467,2571,2576,2581,2587,2599,2602,2617,2623,2630,2634,2645,2648,2662,2693,2696,2707,2724,2728,4853,4857,4863,4948,4952,4959,4964,4970,4978,4989,4995,5007,5014,5027,5044,5048,5054,5060,5064,5069,5073,5085,5091,5100,5105,5115,5203,5221,5225,5236,5240,5245,5269,5272,5279,5284,5288,5295,5299,5310,5313,5327,5331,5341,5346,5357,5361,5372,5380,5384,5396,5400,5406,5409,5419,5426,5435,5442,5452,5457,5468,5472,5477,5481,5495,5498,5511,5527,5530,5537,5548,5558,5560,5577,5583,5587,5597,5608,5614,5618,5628,5635,5650,5662,5668,5682,5687,5691,5698,5707,5712,5717,5723,5734,5747,5758,5761,5772,5785,5792,5797,5802,5807,5814,5823-5824,5829,5832,5848,5854,5857,5874,5879,5883,5894,5898,5903,5907,5917,5923,5933,5937,5948,5959,5963,5974,5978,5996,6005,6009,6016,6028,6032,6037,6041,6055,6058,6063,6070,6079,6085,6090,6100,6106,6115,6125,6129,6139,6197,6200,6207,6213,6217,6223,6227,6237,6243,6255,6259,6339,6349,6353,6365,6369,6384,6391,6395,6401,6414,6418,6430,6434,6439,6460,6466,6471,6475,6486,6501,6505,6516,6520,6529,6537,6544,6550,6554,6595,6607,6609,6615,6641,6647,7177,7186,7197,7204,7208,7214,7216,7228,7233,7239,7254,7264,7269,7273,7285,7288,7303,7307,7317,7322,7334,7347,7358,7366,7370,7375,7377,7389,7395,7407,7409,7419,7433,7443,7454,7460,7464,7474,7484,7491,7501,7511,7521,7532,7537,7556,7566,7568,7580,7586,7591,7595,7616,7680,7685,7746,7757,7767,7770,9046,9050,9062,9066,9078,9082,9107,9119,9125,9129,9135,9139,9158,9172,9176,9188,9192,9197,9204,9212,9301,9305,9317,9321,9331,9367,9370,9382,9386,9397,9401,9413,9417,9428,9432,9444,9450,9460,9464,9469,9478,9482,9487,9491,9501,9513,9519,9523,9533,9540,9549,9559,9569,9580,9584,9589,9595,9602,9614,9618,9623,9627,9645,9657,9670,9674,9732,9736,9743,9747,9757,9763,9774,9779,9790,9793,9804,9809,9820,9826,9831,9835,9846,9850,9855,9858,9869,9884,9889,9899,9904,9909,9914,9929,9939,9957,9960,9967,9969,9981,9984,9989,9995,10020,10034,10116,10120,10123,10130,10139,10151,10167,10170,10216,10261,10265,10277,10281,10293,10297,10313,10325,10329,10341,10345,10357,10360,10367,10373,10377,10388,10392,10404,10410,10420,10426,10436,10440,10450,10468,10472,10477,10481,10491,10505,10511,10513,10527,10531,10542,10546,10551,10561,10574,10578,10583,10604,10608,10613,10617,10632,10636,10641,10645,10651,10658,10662,10678,10682,10687,10692,10698,10708,10712,10719,10724,10734,10738,10748,10758,10765,10772,10782,10787,10798,10802,10812,10817,10823,10841,10849,10855,10858,10870,10879,10891,10898,10908,10917,10923,10934,10943,10955,10960,10963,10974,10980,10989,11003,11008,11017,11027,11038,11044,11053,11063,11074,11083,11090,11097,11111,11115,11125,11129,11139,11148,11152,11158,11170,11177,11184,11187,11199,11206,11210,11221,11224,11231,11236,11246,11250,11262,11270,11279,11284,11294,11299,11320,11323,11330,11340,11345,11356,11362,11371,11376,11385,11393,11405,11415,11419,11425,11436,11446,11450,11461,11466,11477,11481,11487,11492,11496,11502,11507,11518,11520,11526,11542,11546,11552,11555,11572,11576,11581,11587,11620,11630,11634,11652,11663,11665,11671,11682,11693,11697,11776,11785,11791,11798,11811,11821,11828,11837,11848,11858,11868,11873,11883,11890,11905,11918,11921,11927,11938,11948,11953,12032,12621,12625,12638,12641,12652,12656,12668,12759,13314,13324,13328,13335,13339,13344,13351,13355,13367,13371,13387,13394,13406,13415,13419,13433,13447,13451,13463,13467,13479,13495,13499,13509,13515,13526,13530,13545,13570,13580,13584,13589,13593,13600,13607,13610,13845,14888,14895,14979,14989,14993,14999,15003,15010,15020,15030,15045,15050,19453,19710,19774,19790,19796,19800,19806,19810,19822,19826,19839,19854,19858,19870,19874,19886,19890,19903,19906,19919,19923,19934,19939,19950,19954,19965,20030,20046,20050,20062,20066,20078,20082,20095,20110,20114,20126,20129,20142,20146,20156,20162,20172,20177,20187,20192,20199,20203,20222,20226,20239,20243,20254,20259,20270,20274,20286,20290,20300,20304,20317,20320,20332,20337,20343,20347,20354,20366,20370,20380,20386,20396,20400,20406,20416,20423,20427,20438,20457,20464,20470,28117,28121,28149,28415,28502,28506,28511,28518,28522,28527,28531,28543,28559,28563,28579,28597,28600,28611,28622,28627,28637,28642,28653,28657,28663,32598,32602,32614,32629,32633,32668,32677,32681,32694,32698,32703-32704,32709,32712,32724,32728,32734,32742,32760,3276656800.6 58884.81.78448 2.49827Radiolotss_dr3 In this data release from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 88% of the northern sky. The individual pointing images (at 6'' and 20'' resolution) were derived from 12,950 hrs (18.6 PB) of LOFAR High Band Antenna data which were processed through fully automated direction-independent and direction-dependent calibration pipelines that correct for instrumental effects as well as spatially and temporally varying ionospheric distortions. The Stokes I images were then combined, accounting for the rms noise level and telescope beam, to form the final Stokes I mosaic images at 6'' and 20'' resolution, with a central frequency of 144MHz. From the 6'' resolution Stokes mosaics we derived a catalogue of 13,664,379 radio sources (consisting of 16,943,656 Gaussian components), the majority of which have never been detected at radio wavelengths before. These mosaics have a median rms sensitivity of 92 μJy/beam; a random and systematic flux density scale accuracy of approximately 6% and 2%, respectively; an astrometric accuracy of 0.24''; and we estimate that we detect more than 95% of sources with integrated flux densities exceeding nine times the local root mean square noise. To enable thorough scientific exploitation of this unique dataset, we have published two sub-collections. The first contains all the Stokes I mosaic products described above. The second contains the individual pointing products, including calibrated uv data (measurement sets and direction-dependent calibration solutions) to allow for re-imaging or post-processing; Stokes I images at 6' ' and 20'' resolution (with associated scaling factors required to reproduce the mosaic images); Stokes V images at 6'' resolution for each observing epoch; and Stokes Q and U image cubes at 20'' and 4' resolution.lotss_dr3.mosaics In this data release from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 88% of the northern sky. The individual pointing images (at 6'' and 20'' resolution) were derived from 12,950 hrs (18.6 PB) of LOFAR High Band Antenna data which were processed through fully automated direction-independent and direction-dependent calibration pipelines that correct for instrumental effects as well as spatially and temporally varying ionospheric distortions. The Stokes I images were then combined, accounting for the rms noise level and telescope beam, to form the final Stokes I mosaic images at 6'' and 20'' resolution, with a central frequency of 144MHz. From the 6'' resolution Stokes mosaics we derived a catalogue of 13,664,379 radio sources (consisting of 16,943,656 Gaussian components), the majority of which have never been detected at radio wavelengths before. These mosaics have a median rms sensitivity of 92 μJy/beam; a random and systematic flux density scale accuracy of approximately 6% and 2%, respectively; an astrometric accuracy of 0.24''; and we estimate that we detect more than 95% of sources with integrated flux densities exceeding nine times the local root mean square noise. To enable thorough scientific exploitation of this unique dataset, we have published two sub-collections. The first contains all the Stokes I mosaic products described above. The second contains the individual pointing products, including calibrated uv data (measurement sets and direction-dependent calibration solutions) to allow for re-imaging or post-processing; Stokes I images at 6' ' and 20'' resolution (with associated scaling factors required to reproduce the mosaic images); Stokes V images at 6'' resolution for each observing epoch; and Stokes Q and U image cubes at 20'' and 4' resolution.accrefAccess key for the dataAccess.ReferencecharindexednullableownerOwner of the datacharnullableembargoDate the data will become/became publicacharnullablemimeMIME type of the file servedmeta.code.mimeAccess.FormatcharnullableaccsizeSize of the data in bytesbyteVOX:Image_FileSizeAccess.SizelongnullablecenteralphaApproximate center of image, RAdegPOS_EQ_RA_MAINdoublenullablecenterdeltaApproximate center of image, DecdegPOS_EQ_DEC_MAINdoublenullableimagetitleSynthetic name of the imageVOX:Image_TitlecharnullableinstidIdentifier of the originating instrumentINST_IDcharnullabledateobsEpoch at midpoint of observationdVOX:Image_MJDateObsdoublenullablenaxesNumber of axes in dataVOX:Image_NaxesintnullablepixelsizeNumber of pixels along each of the axespixVOX:Image_NaxisintnullablepixelscaleThe pixel scale on each image axisdeg/pixVOX:Image_ScalefloatnullablerefframeCoordinate system reference frameVOX:STC_CoordRefFramecharnullablewcs_equinoxEquinox of the given coordinatesyrVOX:STC_CoordEquinoxfloatnullablewcs_projectionFITS WCS projection typeVOX:WCS_CoordProjectioncharnullablewcs_refpixelWCS reference pixelpixVOX:WCS_CoordRefPixelfloatnullablewcs_refvaluesWorld coordinates at WCS reference pixeldegVOX:WCS_CoordRefValuedoublenullablewcs_cdmatrixFITS WCS CDij matrixdeg/pixVOX:WCS_CDMatrixfloatnullablebandpassidFreeform name of the bandpass usedVOX:BandPass_IDcharnullablebandpassunitUnit of bandpass specifications (always m).VOX:BandPass_UnitcharnullablebandpassrefvalCharacteristic quantity for the bandpass of the imagemVOX:BandPass_RefValuefloatnullablebandpasshiUpper limit of the bandpass (in BandPass_Unit units)mVOX:BandPass_HiLimitfloatnullablebandpassloLower limit of the bandpass (in BandPass_Unit units)mVOX:BandPass_LoLimitfloatnullablepixflagsFlags specifying the processing done (C-original; F-resampled; Z-fluxes valid; X-not resampled; V-for display onlyVOX:Image_PixFlagscharnullablecoverageField covered by the imagedegdoubleindexednullablemosaic_idThe name of the mosaic.meta.id;meta.maincharnullablerelated_productsLink related products for the observationmeta.ref.urlcharnullablelofar_obsidsObsID(s) of the LOFAR observation(s) used for imaging the central pointing.meta.id;obsintnullablerecord_idSurf Data Repository record ID.meta.bibcharnullablemd5md5 checksum of the filemeta.fits;meta.numbercharnullabledatefirstobsEpoch of first observationdtime.epoch;time.startdoublenullabledatelastobsEpoch of last observationdtime.epoch;time.enddoublenullabledateallobsEpoch of all observationstime.epochdoublenullableivoaDefinition and support code for the ObsCore data model and table.ivoa.obscoreThis data collection is queriable in The VO @ ASTRON's obscore table.