Table information for 'lotss_dr2.mosaics'


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Resource Description: In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30′ and 1h00m +28°00′ and spanning 4178 and 1457 square degrees respectively. The images were derived from 3,451 hrs (7.6 PB) of LOFAR High Band Antenna data which were corrected for the direction-independent instrumental properties as well as direction-dependent ionospheric distortions during extensive, but fully automated, data processing. A catalogue of 4,395,448 radio sources is derived from our total intensity (Stokes I) maps, where the majority of these have never been detected at radio wavelengths before. At 6′′ resolution, our full bandwidth Stokes I continuum maps with a central frequency of 144 MHz have: a median rms sensitivity of 83 μ Jy/beam; a flux density scale accuracy of approximately 10%; an astrometric accuracy of 0.2′′; and we estimate the point-source completeness to be 90% at a peak brightness of 0.8 mJy/beam. By creating three 16 MHz bandwidth images across the band we are able to measure the in-band spectral index of many sources, albeit the error on the derived spectral index is > ±0.2 which is a consequence of our flux-density scale accuracy and small fractional bandwidth. Our circular polarisation (Stokes V) 20′′ resolution 120-168 MHz continuum images have a median rms sensitivity of 95 μ Jy/beam, and we estimate a Stokes I to Stokes V leakage of 0.056%. Our linear polarisation (Stokes Q and Stokes U) image cubes consist of 480 97.6 kHz wide planes and have a median rms sensitivity per plane of 10.8mJy/beam at 4′ and 2.2mJy/beam at 20′′; we estimate the Stokes I to Stokes Q/U leakage to be approximately 0.2%. Here we characterise and publicly release our Stokes I, Q, U and V images in addition to the calibrated uv-data to facilitate the thorough scientific exploitation of this unique dataset.

For a list of all services and tables belonging to this table's resource, see Information on resource 'lotss_dr2/q'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference 2022A&A...659A...1S (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.

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

  title={Untitled Resource},
  author={Shimwell, T. W. and Hardcastle, M. J. and Tasse, C. and Best, P. N. and Röttgering, H. J. A. and Williams, W. L. and Botteon, A. and Drabent, A. and Mechev, A. and Shulevski, A. and van Weeren, R. J. and Bester, L. and Brüggen, M. and Brunetti, G. and Callingham, J. R. and Chyży, K.T. and Conway, J. E. and Dijkema, T. J. and Duncan, K. and de Gasperin, F. and Hale, C. L. and Haverkorn, M. and Hugo, B. and Jackson, N. and Mevius, M. and Miley, G. K. and Morabito, L. K. and Morganti, R. and Offringa, A. and Oonk, J. B. R. and Rafferty, D. and Sabater, J. and Smith, D. J. B. and Schwarz, D. J. and Smirnov, O. and O’Sullivan, S. P. and Vedantham, H. and White, G. J. and Albert, J. G. and Alegre, L. and Asabere, B. and Bacon, D. J. and Bonafede, A. and Bonnassieux, E. and Brienza, M. and Bilicki, M. and Bonato, M. and Calistro Rivera, G. and Cassano, R. and Cochrane, R. and Croston, J. H. and Cuciti, V. and Dallacasa, D. and Danezi, A. and Dettmar, R. J. and Di Gennaro, G. and Edler, H. W. and Enßlin, T. A. and Emig, K. L. and Franzen, T. M. O. and Garc\\’ia-Vergara, C. and Grange, Y. G. and Gürkan, G. and Hajduk, M. and Heald, G. and Heesen, V. and Hoang, D. N. and Hoeft, M. and Horellou, C. and Iacobelli, M. and Jamrozy, M. and Jelić, V. and Kondapally, R. and Kukreti, P. and Kunert-Bajraszewska, M. and Magliocchetti, M. and Mahatma, V. and Małek, K. and Mandal, S. and Massaro, F. and Meyer-Zhao, Z. and Mingo, B. and Mostert, R. I. J. and Nair, D. G. and Nakoneczny, S. J. and Nikiel-Wroczyński, B. and Orrú, E. and Pajdosz-Śmierciak, U. and Pasini, T. and Prandoni, I. and van Piggelen, H. E. and Rajpurohit, K. and Retana-Montenegro, E. and Riseley, C. J. and Rowlinson, A. and Saxena, A. and Schrijvers, C. and Sweijen, F. and Siewert, T. M. and Timmerman, R. and Vaccari, M. and Vink, J. and West, J. L. and Wołowska, A. and Zhang, X. and Zheng, J.},
  howpublished={{VO} resource provided by the The VO @ {ASTRON}}


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NameTable Head DescriptionUnitUCD
accref Product key Access key for the data N/A N/A
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
centerAlpha Ctr. RA Approximate center of image, RA deg POS_EQ_RA_MAIN
centerDelta Ctr. Dec Approximate center of image, Dec deg POS_EQ_DEC_MAIN
imageTitle Title Synthetic name of the image N/A VOX:Image_Title
instId Instrument Identifier of the originating instrument N/A INST_ID
dateObs Obs. date Epoch at midpoint of observation d VOX:Image_MJDateObs
nAxes #axes Number of axes in data N/A VOX:Image_Naxes
pixelSize Axes Lengths Number of pixels along each of the axes pix VOX:Image_Naxis
pixelScale Scales The pixel scale on each image axis deg/pix VOX:Image_Scale
refFrame Ref. Frame Coordinate system reference frame N/A VOX:STC_CoordRefFrame
wcs_equinox Equinox Equinox of the given coordinates yr VOX:STC_CoordEquinox
wcs_projection Proj. FITS WCS projection type N/A VOX:WCS_CoordProjection
wcs_refPixel Ref. pixel WCS reference pixel pix VOX:WCS_CoordRefPixel
wcs_refValues Ref. values World coordinates at WCS reference pixel deg VOX:WCS_CoordRefValue
wcs_cdmatrix CD matrix FITS WCS CDij matrix deg/pix VOX:WCS_CDMatrix
bandpassId Bandpass Freeform name of the bandpass used N/A VOX:BandPass_ID
bandpassUnit Bandpass unit Unit of bandpass specifications (always m). 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
pixflags P. Flags Flags specifying the processing done (C-original; F-resampled; Z-fluxes valid; X-not resampled; V-for display only N/A VOX:Image_PixFlags
coverage Coverage Field covered by the image deg N/A
mosaic_id Mosaic ID The name of the mosaic. N/A;meta.main
related_products Related products Link related products for the observation N/A meta.ref.url
lofar_obsids LOFAR ObsID(s) ObsID(s) of the LOFAR observation(s) used for imaging the central pointing. N/A;obs
data_PID Persistent Identifier EPIC PID of the data product (for citation). N/A meta.bib
adler32 Adler32 checksum Adler32 checksum of the file N/A meta.fits;meta.number

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LoTSS Data Release 2 is licensed under the Creative Commons Attribution Share-Alike 3.0 License