Table information for 'lotss_dr3.pointings'

General

This table is available for ADQL queries and through the TAP endpoint.

Resource 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 μJy/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. To enable thorough scientific exploitation of this unique dataset, we have published two sub-collections. The first contains all the Stokes I mosaic products described above. The second 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.

For a list of all services and tables belonging to this table's resource, see Information on resource 'lotss_dr3/q'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference Shimwell et al. 2026 either in addition to or instead of the service reference.

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:lotss_dr3_pointings,
  year=2026,
  title={Untitled Resource},
  author={Shimwell, T. W. and Hardcastle, M. J. and Tasse, C. and Drabent, A. and Botteon, A. and Williams, W. L. and Best, P.N. and Röttgering, H. J. A. and Brüggen, M. and Brunetti, G. and Callingham, J. R. and Chyży, K. T. and Conway, J. E. and De Gasperin, F. and Haverkorn, M. and Horellou, C. and Jackson, N. and Miley, G. K. and Morabito, L. K. and Morganti, R. and O'Sullivan, S. P. and Schwarz, D. J. and Smith, D. J. B. and van Weeren, R. J. and Vedantham, H. K. and White, G. J. and Ahmadi, A. and Alegre, L. and Arias, M. and Asabere, B. and Bahr-Kalus, B. and Barkus, B. and Bilicki, M. and Böhme, L. and Brentjens, M. and Brienza, M. and Bomans, D. J. and Bonafede, A. and Bonato, M. and Bonnassieux, E. and Boxelaar, J. M. and Camera, S. and Cassano, R. and Chilufya, J. and Cianfaglione, M. and Croston, J. H. and Cuciti, V. and Dabhade, P. and De Rubeis, E. and de Jong, J. M. G. H. J. and Dallacasa, D. and Dettmar, R. J. and Duncan, K. J. and Di Gennaro, G. and Edler, H. W. and Groeneveld, C. and Gürkan, G. and Hajduk, M. and Hale, C. L. and Heesen, V. and Hoang, D. N. and Hoeft, M. and Holties, H. and Horton, M. A. and Iacobelli, M. and Jamrozy, M. and Jarvis, M. J. and Jelic, V. and Kadler, M. and Kondapally, R. and Kunert-Bajraszewska, M. and Loose, M. and Magliocchetti, M. and Małek, K. and Manzano, C. and {McKean}, J. P. and Mevius, M. and Mingo, B. and Miskolczi, A. and Misra, A. and Moldón, J. and Nair, D.G. and Nakoneczny, S. J. and Orru, E. and Pashapour-Ahmadabadi, M. and Pasini, T. and Petley, J. and Pierce, J. C. S. and Prandoni, I. and Rafferty, D. and Rajpurohit, K. and Riseley, C.J. and Roberts, I. D. and Sethi, S. and Shulevski, A. and Stein, M. and Stuardi, C. and Sweijen, F. and ter Veen, S. and Timmerman, R. and Vaccari, M. and Wijnholds, S.},
  url={https://vo.astron.nl/tableinfo/lotss_dr3.pointings},
  howpublished={{VO} resource provided by the The VO @ {ASTRON}}
}

Fields

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
accref Identifier Identifier used to reference the pointing in DataLink. N/A meta.id;meta.main
owner Owner Owner of the data N/A N/A
embargo Embargo ends Date the data will become/became public a N/A
mime Type MIME type of the file served N/A meta.code.mime
accsize File size Size of the data in bytes byte VOX:Image_FileSize
sdr_url SDR record SURF Data Repository record for this pointing. N/A meta.ref.url
pointing_id Pointing ID The name of the pointing. N/A meta.id;meta.main
centerAlpha Ctr. RA Approximate center of pointing, RA. deg pos.eq.ra;meta.main
centerDelta Ctr. Dec Approximate center of pointing, Dec. deg pos.eq.dec;meta.main
instrument Instrument Identifier of the originating instrument. N/A meta.id;instr
dateObs Obs. date Epoch at midpoint of observation. d VOX:Image_MJDateObs
refFrame Ref. Frame Coordinate system reference frame. N/A VOX:STC_CoordRefFrame
equinox Equinox Equinox of the given coordinates. yr VOX:STC_CoordEquinox
bandpassId Bandpass Freeform name of the bandpass used. N/A VOX:BandPass_ID
bandpassUnit Bandpass unit Unit of bandpass specifications. N/A VOX:BandPass_Unit
bandpassRefval Band ref. Characteristic quantity for the bandpass of the image. m VOX:BandPass_RefValue
bandpassHi Band upper Upper limit of the bandpass (in BandPass_Unit units). m VOX:BandPass_HiLimit
bandpassLo Band lower Lower limit of the bandpass (in BandPass_Unit units). m VOX:BandPass_LoLimit
lofar_obsids LOFAR ObsID(s) ObsID(s) of the LOFAR observation(s) used for imaging the central pointing. N/A meta.id;obs
record_id Record ID SURF Data Repository record ID. N/A meta.bib
dateFirstObs Date first obs. Epoch of first observation d time.epoch;time.start
dateLastObs Date last obs. Epoch of last observation d time.epoch;time.end
dateAllObs Date all obs. Epoch of all observations N/A time.epoch
related_products Related products Link to related products for the observation. N/A meta.ref.url

Columns that are parts of indices are marked like this.

Other

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VOResource

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Copyright and such:

LoTSS Data Release 3 is licensed under the Creative Commons Attribution Share-Alike 3.0 License

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