The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P173+05)

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 (P173+05)

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 P173+05.

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

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Files

Files (261.0 GB)

Name	Size	Status
images.tar	10.9 GB	Online	Download
Checksum: md5:06ae4bd20fe686aa98e58b46c6a1c09b EPIC PID: 11112/68813d31-e4bb-4776-9f9d-aafccc423ba2 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	307.2 MB	Online	Download
Checksum: md5:6796bca5ade5989868293744b8f8946e EPIC PID: 11112/98ad5f54-c330-46e3-bb95-268684dd0e79 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	Offline	Request
Checksum: md5:6f86ce774a2a0dadc564d74d3c133431 EPIC PID: 11112/516a5854-ec3d-4200-9c05-24c1552df5df 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_P173+05.tar.gz	15.2 MB	Offline	Request
Checksum: md5:845696ea9ac37ba731ae88600506260c EPIC PID: 11112/192426e8-e79b-4d2c-baee-0ffc495c8232 Description: 20′′ RM-synthesis products, including QU spectra, Faraday depth and polarization maps, noise products and catalogues.
stokes_large.tar	41.6 GB	Offline	Request
Checksum: md5:351aa179e511811b72749fd141764b3f EPIC PID: 11112/f1b19293-d69d-4b85-b82f-41a6eade365f Description: The low (20′′) resolution 120-168MHz Stokes Q and U image cubes for this pointing.
stokes_small.tar	57.0 GB	Online	Download
Checksum: md5:e10d695a8acce94aa75ffe755a8b0468 EPIC PID: 11112/2a98d465-2cab-4b55-b6c8-b4bed857e792 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_L2032805.tar	23.6 GB	Offline	Request
Checksum: md5:e6be901cb77b3dfc2ae46dc8363f5ae1 EPIC PID: 11112/20af7156-1a8e-4556-b15c-52db7d9f7b5e 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_L2034427.tar	21.1 GB	Offline	Request
Checksum: md5:978dfe53d94bd968a63eb6ed2ac06e6b EPIC PID: 11112/2fcb5dd5-cd19-405a-86fb-893a37e88fbc 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_L2034436.tar	21.1 GB	Online	Download
Checksum: md5:83a6d24ae2cefdb16fe7dcfa89d78c19 EPIC PID: 11112/f25e1805-37ef-4e8c-91c7-40cfb97d79a7 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_L2034443.tar	24.4 GB	Online	Download
Checksum: md5:e2d3a10642101293272ebb415e8b4a68 EPIC PID: 11112/5fd6b676-0dea-4a0a-bb6b-fecc1f616d49 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_L2034450.tar	24.4 GB	Online	Download
Checksum: md5:374d8c4566322df7eea429ebc328cb87 EPIC PID: 11112/9c214074-2b56-4961-91e7-f67c717e5376 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_L2034457.tar	24.4 GB	Offline	Request
Checksum: md5:af80a7f646694aaea050e11f5b2f1c6d EPIC PID: 11112/1cdb93f6-d9ba-4c8e-8d7f-f7df8a296735 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	10.4 GB	Online	Download
Checksum: md5:9c8d932923869ec60514bcb86b6812cf EPIC PID: 11112/155950be-d56d-4f65-be9d-7ec24d4c9b10 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/P173%2B05
centeralpha	173.86025065470358
centerdelta	4.53640277774771
instid	LOFAR.HBA
dateobs	60405.871493055485
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	173.86004166667, 4.5366111111111
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	169.7221847159784, 0.3870049063039703, 169.67445038831397, 8.662393125475916, 178.0456329450259, 8.662393125475916, 177.99789861736147, 0.38700490630397083
related_products	https://vo.astron.nl/lotss_dr3/q/dlpointing/dlmeta?ID=ivo%3A//astron.nl/%7E%3FLoTSS-DR3/P173%2B05
datefirstobs	60299.171620370355
datelastobs	60438.79350694455
dateallobs	60299.171620370355, 60363.975011574104, 60405.871493055485, 60422.83920138888, 60433.80457175942, 60438.79350694455
id	P173+05

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Data volume	974.4 GB	974.4 GB

The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P173+05)

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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P173+05)

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