Published February 16, 2026 | Version v1
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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (HP-16)

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 all the Stokes I mosaic products described above.

This is mosaic HP-16.

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

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Files

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HP-misc-16.tar

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low-mosaic.fits

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mosaic.fits

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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
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accref http://vo.astron.nl/getproduct/LoTSS-DR3/HP-16
centeralpha 135.0
centerdelta 81.21982231598935
instid LOFAR.HBA
dateobs 60161.371481481474
naxes 2
pixelsize 16204, 16204
pixelscale 0.00041666667675599456, 0.00041666667675599456
refframe ICRS
wcs_equinox 2000.0
wcs_projection SIN
wcs_refpixel 8102.0, 8102.0
wcs_refvalues 135.0, 81.21982231598935
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 119.35128077121851, 77.3830812157492, 102.8886229118083, 83.63620077645972, 167.10817489387358, 83.63642042110703, 150.6468777349841, 77.38319267094184
related_products https://vo.astron.nl/lotss_dr3/q/dlmosaic/dlmeta?ID=ivo%3A//astron.nl/%7E%3FLoTSS-DR3/HP-16
datefirstobs 58107.0083333333
datelastobs 60197.13140046317
dateallobs 58107.0083333333, 58294.46597222239, 59174.05334490724, 60109.43263888871, 60110.444444444496, 60197.13140046317, 60174.21846064832, 60174.21846064832, 60162.23280092608, 60177.28274305537, 60177.28274305537, 60161.371481481474, 60161.371481481474
id HP-16