Table information for 'lotss_dr2.main_sources'

General

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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:

@MISC{vo:lotss_dr2_main_sources,
  year=2021,
  title={{LoTSS}-DR2 Source Catalog},
  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.},
  url={https://vo.astron.nl/tableinfo/lotss_dr2.main_sources},
  howpublished={{VO} resource provided by the The VO @ {ASTRON}}
}

Fields

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
Source_Name ID The radio name of the source, automatically generated from RA and DEC in most cases N/A meta.id;meta.main
RA RA Position from PyBDSF or combination of PyBDSF components deg pos.eq.ra;meta.main
E_RA error RA Estimated by PyBDSF. Only fitting uncertainties are included arcsec stat.error;pos.eq.ra
DEC Dec Position from PyBDSF or combination of PyBDSF components deg pos.eq.dec;meta.main
E_DEC error Dec Estimated by PyBDSF. Only fitting uncertainties are included arcsec stat.error;pos.eq.dec
Peak_flux Peak flux The peak Stokes I flux density per beam of the source mJy/beam phot.flux.density;em.radio
E_Peak_flux error Peak flux The 1-sigma error on the peak flux density per beam of the source mJy/beam stat.error;phot.flux.density;em.radio
Total_flux Total flux The total, integrated Stokes I flux density of the source at the reference frequency mJy phot.flux.density;em.radio
E_Total_flux error Total flux The 1-sigma on the total flux density of the source mJy stat.error;phot.flux.density;em.radio
Majax Major Axis The FWHM of the major axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam arcsec phys.angsize
E_Maj E_Maj The 1-sigma error on the FWHM of the major axis of the source arcsec stat.error;phys.angsize
Minax Minor Axis The FWHM of the minor axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam arcsec phys.angsize
E_Min E_Min The 1-sigma error on the FWHM of the minor axis of the source arcsec stat.error;phys.angsize
DC_Maj DC_Maj The FWHM of the major axis of the source, after de-convolution with the 6-arcsec LOFAR beam arcsec phys.angsize
E_DC_Maj E_DC_Maj The 1-sigma error on the FWHM of the deconvolved major axis of the source arcsec stat.error;phys.angsize
DC_Min DC_Min The FWHM of the minor axis of the source, after de-convolution with the 6-arcsec LOFAR beam arcsec phys.angsize
E_DC_Min E_DC_Min The 1-sigma error on the FWHM of the deconvolved minor axis of the source arcsec stat.error;phys.angsize
PA PA The position angle of the major axis of the source measured east of north, INCLUDING convolution with the 6-arcsec LOFAR beam deg pos.posang
E_PA E_PA The 1-sigma error on the position angle of the major axis of the source deg stat.error;pos.posang
DC_PA DC_PA The position angle of the major axis of the source measured east of north, after de-convolution with the 6-arcsec LOFAR beam deg pos.posang
E_DC_PA E_DC_PA The 1-sigma error on the position angle of the deconvolved major axis of the source deg stat.error;pos.posang
Isl_rms RMS noise The average background rms value of the island mJy/beam instr.det.noise
S_Code Morphological Code A code that defines the source structure 'S' for single Gaussian, 'M' for multiple Gaussian, 'C' = a single-Gaussian source in an island with other sources N/A meta.code;src.morph
Mosaic_ID Mosaic The name of the mosaic in which the FITS image can be found N/A meta.id;obs.image
mosaic_url Mosaic_url DataLink to the corresponding mosaic N/A meta.id;obs.image
Number_Pointings Number of pointings Number of pointings that are mosaiced at the position of the source. N/A meta.number
Masked_Fraction Masked Fraction The fraction of the source that is in the CLEAN mask N/A N/A

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

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