Published February 16, 2026
| Version v1
Dataset
Open
The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P337+18)
Creators
- Shimwell, 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.
Description
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 μ Jy/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. This collection 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.
This is pointing P337+18. This pointing was previously released as part of LoTSS-DR2 but it has been reprocessed for LoTSS-DR3 using a different strategy and/or data.
Publication: Shimwell et al. 2026 (https://doi.org/10.1051/0004-6361/202557749)
Go to main LoTSS-DR3 Collection
This is pointing P337+18. This pointing was previously released as part of LoTSS-DR2 but it has been reprocessed for LoTSS-DR3 using a different strategy and/or data.
Publication: Shimwell et al. 2026 (https://doi.org/10.1051/0004-6361/202557749)
Go to main LoTSS-DR3 Collection
Files
Files
(245.1 GB)
| Name | Size | Status | |
|---|---|---|---|
|
images.tar |
23.2 GB |
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misc.tar |
175.4 MB |
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|
mosaicing_misc.tar |
1.7 GB |
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|
stokes_large.tar |
40.5 GB |
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|
stokes_small.tar |
9.8 GB |
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|
uv_L664748.tar |
103.2 GB |
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|
uv_L838450.tar |
55.7 GB |
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|
uv_misc.tar |
10.8 GB |
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Additional details
Related works
- Is described by
- Publication: 10.1051/0004-6361/202557749 (DOI)
Dates
- Created
-
2026-02-16
- Accepted
-
2026-01-13
Collection
- Metadata
| $schema | https://repository.surf.nl/schema/lotss-dr3 |
|---|---|
| accref | https://vo.astron.nl/getproduct/LoTSS-DR3/P337%2B18 |
| centeralpha | 337.64334428053274 |
| centerdelta | 18.180786110942282 |
| instid | LOFAR.HBA |
| dateobs | 58350.83728009276 |
| naxes | 4 |
| pixelsize | 19845, 19845, 1, 1 |
| pixelscale | 0.00041666667675599456, 0.00041666667675599456 |
| refframe | ICRS |
| wcs_equinox | |
| wcs_projection | SIN |
| wcs_refpixel | 9923.0, 9923.0 |
| wcs_refvalues | 337.643125, 18.1809944444 |
| wcs_cdmatrix | -0.00041666667675599456, 0.0, 0.0, 0.00041666667675599456 |
| bandpassid | 120-168MHz |
| bandpassunit | m |
| bandpassrefval | 2.081892 |
| bandpasshi | 2.4982705 |
| bandpasslo | 1.7844789 |
| pixflags | Z |
| coverage | 333.3785512455569, 13.995077155968254, 333.17124412734427, 22.268261887939108, 342.11500587265584, 22.268261887939108, 341.90769875444323, 13.995077155968254 |
| related_products | https://vo.astron.nl/lotss_dr3/q/dlpointing/dlmeta?ID=ivo%3A//astron.nl/%7E%3FLoTSS-DR3/P337%2B18 |
| datefirstobs | 58350.83728009276 |
| datelastobs | 59550.654861111194 |
| dateallobs | 58350.83728009276, 59320.252175925765, 59550.654861111194 |
| id | P337+18 |