The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P029+09)

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 (P029+09)

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 P029+09.

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

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Files (333.7 GB)

Name	Size	Status
images.tar	21.7 GB	Offline	Request
Checksum: md5:19fa5e310a0020254872764691d02eb1 EPIC PID: 11112/e7dcb98c-a79e-4081-b2cd-16929d4d7009 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	357.9 MB	Offline	Request
Checksum: md5:a025be6addfbd825dd966959c1cbd5b7 EPIC PID: 11112/6c15d1e9-e1c6-4b35-b760-3f7258557a56 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: md5:36913746765877195a951efd1b49463a EPIC PID: 11112/6368cca3-e04f-4eb5-9319-f9356912ddfd 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_P029+09.tar.gz	73.4 MB	Offline	Request
Checksum: md5:c3f6cd7778c57cfbbca36407e81d4147 EPIC PID: 11112/f00ad708-5423-46c6-a24f-7030629dab0d Description: 20′′ RM-synthesis products, including QU spectra, Faraday depth and polarization maps, noise products and catalogues.
stokes_large.tar	40.3 GB	Offline	Request
Checksum: md5:a0b2ba6d5da79b6569d8f03b1f70526b EPIC PID: 11112/35774c8e-679f-410b-8cbb-7b6a7f4edbae Description: The low (20′′) resolution 120-168MHz Stokes Q and U image cubes for this pointing.
stokes_small.tar	9.8 GB	Offline	Request
Checksum: md5:3f50fc9779a9ceda18d80d27f7b29c6e EPIC PID: 11112/a38c24e9-1e3f-4b9b-b0bc-b8a7c443ce9c 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_L829446.tar	63.7 GB	Online	Download
Checksum: md5:96fae8310b7a5f92a7055b4bad85a20d EPIC PID: 11112/77db9500-8f85-4fb5-88ce-5ec20c503ec2 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_L830596.tar	55.9 GB	Offline	Request
Checksum: md5:0e8ef2193e59f572264add0565c8b827 EPIC PID: 11112/25fad41a-5b27-41e8-bbbf-45afc993ba30 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_L835963.tar	63.8 GB	Offline	Request
Checksum: md5:d3884b213dcb7cef6150c016dc8817b1 EPIC PID: 11112/0228d03a-839f-4513-835d-3959fb9d7fa5 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_L839104.tar	61.7 GB	Online	Download
Checksum: md5:7cadb7e239ba8bb3301331040ee661f3 EPIC PID: 11112/9aabe457-e832-41fb-9a46-4dcbb7172cfe 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	14.6 GB	Offline	Request
Checksum: md5:25dc880117f5358dd4af7dba7fe4db3e EPIC PID: 11112/a02af6e8-0fd3-42e8-9e6d-9befab233582 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

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accref	https://vo.astron.nl/getproduct/LoTSS-DR3/P029%2B09
bandpasshi	2.4982705
bandpassid	120-168MHz
bandpasslo	1.7844789
bandpassrefval	2.081892
bandpassunit	m
centeralpha	29.751289864065022
centerdelta	8.591018055498337
coverage	25.600890459524404, 4.43102844540879, 25.509256779447682, 12.706058080863041, 33.99290155388633, 12.706058080863041, 33.901267873809594, 4.43102844540879
dateallobs	59461.02847222239, 59464.02847222239, 59526.84097222239, 59557.83819444431
datefirstobs	59461.02847222239
datelastobs	59557.83819444431
dateobs	59464.02847222239
id	P029+09
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/P029%2B09
wcs_cdmatrix	-0.00041666667675599456, 0.0, 0.0, 0.00041666667675599456
wcs_projection	SIN
wcs_refpixel	9923.0, 9923.0
wcs_refvalues	29.751079166667, 8.5912263888889

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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P029+09)

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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P029+09)

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