Published February 16, 2026 | Version v1
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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (HP-1618)

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-1618.

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

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Files

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HP-misc-1618.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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instid LOFAR.HBA
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naxes 2
pixelsize 15510, 15510
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refframe ICRS
wcs_equinox 2000.0
wcs_projection SIN
wcs_refpixel 7755.0, 7755.0
wcs_refvalues 281.25, -2.388015463268777
wcs_cdmatrix -0.00041666667675599456, 0.0, 0.0, 0.00041666667675599456
bandpassid 120-168MHz
bandpassunit m
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pixflags Z
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id HP-1618