ivo://astron.nl/lotss_dr2/q/mosaicsASTRONShimwell, T. W.Hardcastle, M. J.Tasse, C.Best, P. N.Röttgering, H. J. A.Williams, W. L.Botteon, A.Drabent, A.Mechev, A.Shulevski, A.van Weeren, R. J.Bester, L.Brüggen, M.Brunetti, G.Callingham, J. R.Chyży, K.T.Conway, J. E.Dijkema, T. J.Duncan, K.de Gasperin, F.Hale, C. L.Haverkorn, M.Hugo, B.Jackson, N.Mevius, M.Miley, G. K.Morabito, L. K.Morganti, R.Offringa, A.Oonk, J. B. R.Rafferty, D.Sabater, J.Smith, D. J. B.Schwarz, D. J.Smirnov, O.O’Sullivan, S. P.Vedantham, H.White, G. J.Albert, J. G.Alegre, L.Asabere, B.Bacon, D. J.Bonafede, A.Bonnassieux, E.Brienza, M.Bilicki, M.Bonato, M.Calistro Rivera, G.Cassano, R.Cochrane, R.Croston, J. H.Cuciti, V.Dallacasa, D.Danezi, A.Dettmar, R. J.Di Gennaro, G.Edler, H. W.Enßlin, T. A.Emig, K. L.Franzen, T. M. O.Garc\’ia-Vergara, C.Grange, Y. G.Gürkan, G.Hajduk, M.Heald, G.Heesen, V.Hoang, D. N.Hoeft, M.Horellou, C.Iacobelli, M.Jamrozy, M.Jelić, V.Kondapally, R.Kukreti, P.Kunert-Bajraszewska, M.Magliocchetti, M.Mahatma, V.Małek, K.Mandal, S.Massaro, F.Meyer-Zhao, Z.Mingo, B.Mostert, R. I. J.Nair, D. G.Nakoneczny, S. J.Nikiel-Wroczyński, B.Orrú, E.Pajdosz-Śmierciak, U.Pasini, T.Prandoni, I.van Piggelen, H. E.Rajpurohit, K.Retana-Montenegro, E.Riseley, C. J.Rowlinson, A.Saxena, A.Schrijvers, C.Sweijen, F.Siewert, T. M.Timmerman, R.Vaccari, M.Vink, J.West, J. L.Wołowska, A.Zhang, X.Zheng, J.https://repository.surfsara.nl/api/objects/collection/lotss-dr2/thumbnail2024-05-30T10:56:59Michael Sipior

Oude Hoogeveensedijk 4, 7991PD Dwingeloo, the Netherlands

vo@astron.nlradio continuum: general, techniques: image processing In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30′ and 1h00m +28°00′ and spanning 4178 and 1457 square degrees respectively. The images were derived from 3,451 hrs (7.6 PB) of LOFAR High Band Antenna data which were corrected for the direction-independent instrumental properties as well as direction-dependent ionospheric distortions during extensive, but fully automated, data processing. A catalogue of 4,395,448 radio sources is derived from our total intensity (Stokes I) maps, where the majority of these have never been detected at radio wavelengths before. At 6′′ resolution, our full bandwidth Stokes I continuum maps with a central frequency of 144 MHz have: a median rms sensitivity of 83 μ Jy/beam; a flux density scale accuracy of approximately 10%; an astrometric accuracy of 0.2′′; and we estimate the point-source completeness to be 90% at a peak brightness of 0.8 mJy/beam. By creating three 16 MHz bandwidth images across the band we are able to measure the in-band spectral index of many sources, albeit the error on the derived spectral index is > ±0.2 which is a consequence of our flux-density scale accuracy and small fractional bandwidth. Our circular polarisation (Stokes V) 20′′ resolution 120-168 MHz continuum images have a median rms sensitivity of 95 μ Jy/beam, and we estimate a Stokes I to Stokes V leakage of 0.056%. Our linear polarisation (Stokes Q and Stokes U) image cubes consist of 480 97.6 kHz wide planes and have a median rms sensitivity per plane of 10.8mJy/beam at 4′ and 2.2mJy/beam at 20′′; we estimate the Stokes I to Stokes Q/U leakage to be approximately 0.2%. Here we characterise and publicly release our Stokes I, Q, U and V images in addition to the calibrated uv-data to facilitate the thorough scientific exploitation of this unique dataset.2022A&A...659A...1Shttps://vo.astron.nl/tableinfo/lotss_dr2.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 58884.87.95129e-26 1.1132e-25Radiolotss_dr2 In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30′ and 1h00m +28°00′ and spanning 4178 and 1457 square degrees respectively. The images were derived from 3,451 hrs (7.6 PB) of LOFAR High Band Antenna data which were corrected for the direction-independent instrumental properties as well as direction-dependent ionospheric distortions during extensive, but fully automated, data processing. A catalogue of 4,395,448 radio sources is derived from our total intensity (Stokes I) maps, where the majority of these have never been detected at radio wavelengths before. At 6′′ resolution, our full bandwidth Stokes I continuum maps with a central frequency of 144 MHz have: a median rms sensitivity of 83 μ Jy/beam; a flux density scale accuracy of approximately 10%; an astrometric accuracy of 0.2′′; and we estimate the point-source completeness to be 90% at a peak brightness of 0.8 mJy/beam. By creating three 16 MHz bandwidth images across the band we are able to measure the in-band spectral index of many sources, albeit the error on the derived spectral index is > ±0.2 which is a consequence of our flux-density scale accuracy and small fractional bandwidth. Our circular polarisation (Stokes V) 20′′ resolution 120-168 MHz continuum images have a median rms sensitivity of 95 μ Jy/beam, and we estimate a Stokes I to Stokes V leakage of 0.056%. Our linear polarisation (Stokes Q and Stokes U) image cubes consist of 480 97.6 kHz wide planes and have a median rms sensitivity per plane of 10.8mJy/beam at 4′ and 2.2mJy/beam at 20′′; we estimate the Stokes I to Stokes Q/U leakage to be approximately 0.2%. Here we characterise and publicly release our Stokes I, Q, U and V images in addition to the calibrated uv-data to facilitate the thorough scientific exploitation of this unique dataset.lotss_dr2.mosaics In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30′ and 1h00m +28°00′ and spanning 4178 and 1457 square degrees respectively. The images were derived from 3,451 hrs (7.6 PB) of LOFAR High Band Antenna data which were corrected for the direction-independent instrumental properties as well as direction-dependent ionospheric distortions during extensive, but fully automated, data processing. A catalogue of 4,395,448 radio sources is derived from our total intensity (Stokes I) maps, where the majority of these have never been detected at radio wavelengths before. At 6′′ resolution, our full bandwidth Stokes I continuum maps with a central frequency of 144 MHz have: a median rms sensitivity of 83 μ Jy/beam; a flux density scale accuracy of approximately 10%; an astrometric accuracy of 0.2′′; and we estimate the point-source completeness to be 90% at a peak brightness of 0.8 mJy/beam. By creating three 16 MHz bandwidth images across the band we are able to measure the in-band spectral index of many sources, albeit the error on the derived spectral index is > ±0.2 which is a consequence of our flux-density scale accuracy and small fractional bandwidth. Our circular polarisation (Stokes V) 20′′ resolution 120-168 MHz continuum images have a median rms sensitivity of 95 μ Jy/beam, and we estimate a Stokes I to Stokes V leakage of 0.056%. Our linear polarisation (Stokes Q and Stokes U) image cubes consist of 480 97.6 kHz wide planes and have a median rms sensitivity per plane of 10.8mJy/beam at 4′ and 2.2mJy/beam at 20′′; we estimate the Stokes I to Stokes Q/U leakage to be approximately 0.2%. Here we characterise and publicly release our Stokes I, Q, U and V images in addition to the calibrated uv-data to facilitate the thorough scientific exploitation of this unique dataset.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;obsintnullabledata_pidEPIC PID of the data product (for citation).meta.bibcharnullableadler32Adler32 checksum of the filemeta.fits;meta.numbercharnullableivoaDefinition and support code for the ObsCore data model and table.ivoa.obscoreThis data collection is queriable in The VO @ ASTRON's obscore table.