The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P178+02)

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 (P178+02)

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 P178+02.

Publication: Shimwell et al. 2026 (https://doi.org/10.1051/0004-6361/202557749)

Go to main LoTSS-DR3 Collection

Files

Files (286.7 GB)

Name	Size	Status
images.tar	10.9 GB	Offline	Request
Checksum: md5:c1565bbd8e8088738d4b6e5fbcb669a5 EPIC PID: 11112/f755a41a-cf24-45ce-8c96-bd00ad5de043 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	291.7 MB	Online	Download
Checksum: md5:76247c4bf6a1344796ec7c9a246c06e9 EPIC PID: 11112/a11b329d-8458-4956-b894-29b0bd7e4f76 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:dc6e932d58288596dd14ee021adf84fb EPIC PID: 11112/b066cc7a-7611-49b8-9d23-8233e98dae4e Description: The flux density scaling factors (NVSS scaling and planar alignment) to be applied during mosaicing as well as the facets identified as bad.
rmsynth_P178+02.tar.gz	33.1 MB	Offline	Request
Checksum: md5:dbdd772b3dda14b3b1cd61077b304d43 EPIC PID: 11112/fda48aca-5f2f-4c69-b321-eb47fed5b046 Description: 20′′ RM-synthesis products, including QU spectra, Faraday depth and polarization maps, noise products and catalogues.
stokes_large.tar	41.7 GB	Offline	Request
Checksum: md5:66bc9349e3335bcf6a2f7f581b8ef8e7 EPIC PID: 11112/93894e94-a7e5-42cf-9a0c-29bdbded0487 Description: The low (20′′) resolution 120-168MHz Stokes Q and U image cubes for this pointing.
stokes_small.tar	57.0 GB	Offline	Request
Checksum: md5:d86430c1e8309d144a0d233f6f3bd173 EPIC PID: 11112/c9c9694d-1dac-4650-8c19-7de12a832fb2 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_L822488.tar	27.7 GB	Offline	Request
Checksum: md5:63896d0d5758edd0c14c6dfa8b8ee21f EPIC PID: 11112/40344667-f439-4e09-8877-b8c70a156f59 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_L822530.tar	27.7 GB	Offline	Request
Checksum: md5:3453cc4f82a5b14e12bc70ac8c2dc20c EPIC PID: 11112/860d9caf-bef1-4dab-8f30-974e5cf535e2 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_L823274.tar	27.7 GB	Offline	Request
Checksum: md5:1db533ed17b0b233c8938924df8d27e0 EPIC PID: 11112/00476af0-8473-4232-900c-eda368cc7ab5 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_L824292.tar	27.7 GB	Offline	Request
Checksum: md5:5f56fe776a9fc5ddcee73aef96e7ba9d EPIC PID: 11112/12180eb7-a6ad-4d43-b3c6-d991fe2b513d 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_L824434.tar	27.7 GB	Offline	Request
Checksum: md5:4321757471019d5feaa37014ca16d5ba EPIC PID: 11112/d9c39e54-e13e-4ff6-8495-e127b106207c 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_L835217.tar	25.2 GB	Offline	Request
Checksum: md5:78f9c79d9fb92e61fa6bbd27af872d01 EPIC PID: 11112/d99654af-6c2d-438a-85ad-b9a8fa3e72e0 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	11.1 GB	Offline	Request
Checksum: md5:7e996261c922ca84f896606580636161 EPIC PID: 11112/c9e34ec0-abbc-4769-9670-72e7fda6c60e 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/P178%2B02
centeralpha	178.62260430023633
centerdelta	2.051169722208706
instid	LOFAR.HBA
dateobs	59407.63216435164
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	178.62239583333, 2.0513780555556
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	174.48186963671333, -2.0917478013486885, 174.46037463911037, 6.183749157214931, 182.78441702754975, 6.183749157214931, 182.76292202994622, -2.0917478013486885
related_products	https://vo.astron.nl/lotss_dr3/q/dlpointing/dlmeta?ID=ivo%3A//astron.nl/%7E%3FLoTSS-DR3/P178%2B02
datefirstobs	59400.651284722146
datelastobs	59516.34097222239
dateallobs	59400.651284722146, 59402.64582175948, 59407.63216435164, 59418.61180555541, 59413.61180555541, 59516.34097222239
id	P178+02

	All versions	This version
Views	1	1
Downloads	21	21
Data volume	20.4 GB	20.4 GB

The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P178+02)

Files

Files (286.7 GB)

Additional details

Related works

Dates

Collection

The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P178+02)

Creators

Description

Files

Files (286.7 GB)

Additional details

Related works

Dates

Collection