The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P164+55)

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.

Published February 16, 2026 | Version v1

Dataset Open

The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P164+55)

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 P164+55. 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 (808.9 GB)

Name	Size	Status
images.tar	23.7 GB	Offline	Request
Checksum: md5:2376568b1f1d2096660368c1e7839786 EPIC PID: 11112/92d194a2-71e9-4b1e-9f38-25ce7c2b2148 Description: The Stokes I high (6′′) and low (20′′) 120-168MHz continuum images for this pointing (including restored, residual, model and mask images).
misc.tar	394.0 MB	Online	Download
Checksum: md5:6117959f37ef1ac8abe7d27afa7c372f EPIC PID: 11112/6ca3d8a2-c869-432c-8e40-0bb7b8139234 Description: Miscellaneous products (logs and diagnostics) for the direction dependent calibration and imaging processing (DDF-pipeline) of this pointing.
mosaicing_misc.tar	1.7 GB	Online	Download
Checksum: md5:0d1e8471227e53db96d1ad2d03057d41 EPIC PID: 11112/64239ed8-09bf-4153-b64d-c5e668a31a83 Description: The flux density scaling factors (NVSS scaling and planar alignment) to be applied during mosaicing as well as the facets identified as bad.
stokes_large.tar	42.9 GB	Online	Download
Checksum: md5:de442af7fac7ce63e093c0b61bfbf169 EPIC PID: 11112/781a7221-f113-403b-bbbd-b3d05fea4ed3 Description: The low (20′′) resolution 120-168MHz Stokes Q and U image cubes for this pointing.
stokes_small.tar	9.8 GB	Online	Download
Checksum: md5:327c93c85d291103cbd7acfbbb013e22 EPIC PID: 11112/b6df6c36-b113-44d0-9ac1-814a8401c112 Description: The very low (4′) resolution 120-168MHz Stokes Q and U image cubes for this pointing and, where available, the low (20′′) resolution Stokes V 120-168MHz image.
uv_L259781.tar	120.2 GB	Offline	Request
Checksum: md5:cbc12806626f718f4091f7caa704cf53 EPIC PID: 11112/4ce66ac1-aaff-40a4-a530-5bf0b7094c12 Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L659556.tar	104.0 GB	Online	Download
Checksum: md5:b74a4ef6ddd192e60f836166d668a28d EPIC PID: 11112/ebea97db-9274-4a40-83fc-8e5442fb1527 Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L801324.tar	115.1 GB	Online	Download
Checksum: md5:f064b700a708570feee9f95e2307099d EPIC PID: 11112/11043bd1-df21-4f7f-ac38-cf5550be1885 Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L801338.tar	115.1 GB	Online	Download
Checksum: md5:f77773c0cd7fbfe2f91e019aa2a9c4d7 EPIC PID: 11112/d0dd7f5f-e140-4690-9907-350fb9e265a1 Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L801366.tar	115.1 GB	Online	Download
Checksum: md5:b13d266a19697d7353f7dc75ea7aa91f EPIC PID: 11112/dc03925d-924c-4709-a40e-cbda28e1666b Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L801380.tar	115.1 GB	Online	Download
Checksum: md5:ce1af785daced9d04c96dc73d92c7409 EPIC PID: 11112/fd14d0ef-907d-4e58-a3cb-6448f1c96706 Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_misc.tar	45.9 GB	Online	Download
Checksum: md5:57722c8d5b76db42916575ef9c615d77 EPIC PID: 11112/fc1c06e6-8884-4573-bfce-27ab67f57134 Description: Calibration facet boundaries, calibration sky model, as well as merged and smoothed direction dependent calibration solutions for use during re-imaging.

Additional details

Is described by: Publication: 10.1051/0004-6361/202557749 (DOI)

Created: 2026-02-16
Accepted: 2026-01-13

Metadata

$schema	https://repository.surf.nl/schema/lotss-dr3
accref	https://vo.astron.nl/getproduct/LoTSS-DR3/P164%2B55
bandpasshi	2.4982705
bandpassid	120-168MHz
bandpasslo	1.7844789
bandpassrefval	2.081892
bandpassunit	m
centeralpha	164.63339372620433
centerdelta	54.68492666613203
coverage	158.13948430758307, 50.35548223324223, 156.6753549074925, 58.58767728429056, 172.5907117585076, 58.58767728429056, 171.126582358417, 50.35548223324223
dateallobs	57061.84097222239, 58309.46597222239, 59200.049999999814, 59202.019930555485, 59204.98680555541, 59211.991134259384
datefirstobs	57061.84097222239
datelastobs	59211.991134259384
dateobs	59200.049999999814
id	P164+55
instid	LOFAR.HBA
naxes	4
pixelscale	0.00041666667675599456, 0.00041666667675599456
pixelsize	19845, 19845, 1, 1
pixflags	Z
refframe	ICRS
related_products	https://vo.astron.nl/lotss_dr3/q/dlpointing/dlmeta?ID=ivo%3A//astron.nl/%7E%3FLoTSS-DR3/P164%2B55
wcs_cdmatrix	-0.00041666667675599456, 0.0, 0.0, 0.00041666667675599456
wcs_projection	SIN
wcs_refpixel	9923.0, 9923.0
wcs_refvalues	164.633033333, 54.685135

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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P164+55)

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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P164+55)

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