Report
View in EDS

The LOFAR Two-Metre Sky Survey (LoTSS): VI. Optical identifications for the second data release

Bibliographic Details
Title: The LOFAR Two-Metre Sky Survey (LoTSS): VI. Optical identifications for the second data release
Authors: Hardcastle, M. J., Horton, M. A., Williams, W. L., Duncan, K. J., Alegre, L., Barkus, B., Croston, J. H., Dickinson, H., Osinga, E., Röttgering, H. J. A., Sabater, J., Shimwell, T. W., Smith, D. J. B., Best, P. N., Botteon, A., Brüggen, M., Drabent, A., de Gasperin, F., Gürkan, G., Hajduk, M., Hale, C. L., Hoeft, M., Jamrozy, M., Kunert-Bajraszewska, M., Kondapally, R., Magliocchetti, M., Mahatma, V. H., Mostert, R. I. J., O'Sullivan, S. P., Pajdosz-Śmierciak, U., Petley, J., Pierce, J. C. S., Prandoni, I., Schwarz, D. J., Shulewski, A., Siewert, T. M., Stott, J. P., Tang, H., Vaccari, M., Zheng, X., Bailey, T., Desbled, S., Goyal, A., Gonano, V., Hanset, M., Kurtz, W., Lim, S. M., Mielle, L., Molloy, C. S., Roth, R., Terentev, I. A., Torres, M.
Source: A&A 678, A151 (2023)
Publication Year: 2023
Collection: Astrophysics
Subject Terms: Astrophysics - Astrophysics of Galaxies
More Details: The second data release of the LOFAR Two-Metre Sky Survey (LoTSS) covers 27% of the northern sky, with a total area of $\sim 5,700$ deg$^2$. The high angular resolution of LOFAR with Dutch baselines (6 arcsec) allows us to carry out optical identifications of a large fraction of the detected radio sources without further radio followup; however, the process is made more challenging by the many extended radio sources found in LOFAR images as a result of its excellent sensitivity to extended structure. In this paper we present source associations and identifications for sources in the second data release based on optical and near-infrared data, using a combination of a likelihood-ratio cross-match method developed for our first data release, our citizen science project Radio Galaxy Zoo: LOFAR, and new approaches to algorithmic optical identification, together with extensive visual inspection by astronomers. We also present spectroscopic or photometric redshifts for a large fraction of the optical identifications. In total 4,116,934 radio sources lie in the area with good optical data, of which 85% have an optical or infrared identification and 58% have a good redshift estimate. We demonstrate the quality of the dataset by comparing it with earlier optically identified radio surveys. This is by far the largest ever optically identified radio catalogue, and will permit robust statistical studies of star-forming and radio-loud active galaxies.
Comment: 29 pages. Accepted by A&A; data products available at https://lofar-surveys.org/dr2_release.html
Document Type: Working Paper
DOI: 10.1051/0004-6361/202347333
Access URL: http://arxiv.org/abs/2309.00102
Accession Number: edsarx.2309.00102
Database: arXiv
FullText Text:
  Availability: 0
CustomLinks:
  – Url: http://arxiv.org/abs/2309.00102
    Name: EDS - Arxiv
    Category: fullText
    Text: View this record from Arxiv
    MouseOverText: View this record from Arxiv
  – Url: https://resolver.ebsco.com/c/xy5jbn/result?sid=EBSCO:edsarx&genre=article&issn=&ISBN=&volume=&issue=&date=20230831&spage=&pages=&title=The LOFAR Two-Metre Sky Survey (LoTSS): VI. Optical identifications for the second data release&atitle=The%20LOFAR%20Two-Metre%20Sky%20Survey%20%28LoTSS%29%3A%20VI.%20Optical%20identifications%20for%20the%20second%20data%20release&aulast=Hardcastle%2C%20M.%20J.&id=DOI:10.1051/0004-6361/202347333
    Name: Full Text Finder (for New FTF UI) (s8985755)
    Category: fullText
    Text: Find It @ SCU Libraries
    MouseOverText: Find It @ SCU Libraries
Header DbId: edsarx
DbLabel: arXiv
An: edsarx.2309.00102
RelevancyScore: 1065
AccessLevel: 3
PubType: Report
PubTypeId: report
PreciseRelevancyScore: 1065.24670410156
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: The LOFAR Two-Metre Sky Survey (LoTSS): VI. Optical identifications for the second data release
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Hardcastle%2C+M%2E+J%2E%22">Hardcastle, M. J.</searchLink><br /><searchLink fieldCode="AR" term="%22Horton%2C+M%2E+A%2E%22">Horton, M. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Williams%2C+W%2E+L%2E%22">Williams, W. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Duncan%2C+K%2E+J%2E%22">Duncan, K. J.</searchLink><br /><searchLink fieldCode="AR" term="%22Alegre%2C+L%2E%22">Alegre, L.</searchLink><br /><searchLink fieldCode="AR" term="%22Barkus%2C+B%2E%22">Barkus, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Croston%2C+J%2E+H%2E%22">Croston, J. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Dickinson%2C+H%2E%22">Dickinson, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Osinga%2C+E%2E%22">Osinga, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Röttgering%2C+H%2E+J%2E+A%2E%22">Röttgering, H. J. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Sabater%2C+J%2E%22">Sabater, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Shimwell%2C+T%2E+W%2E%22">Shimwell, T. W.</searchLink><br /><searchLink fieldCode="AR" term="%22Smith%2C+D%2E+J%2E+B%2E%22">Smith, D. J. B.</searchLink><br /><searchLink fieldCode="AR" term="%22Best%2C+P%2E+N%2E%22">Best, P. N.</searchLink><br /><searchLink fieldCode="AR" term="%22Botteon%2C+A%2E%22">Botteon, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Brüggen%2C+M%2E%22">Brüggen, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Drabent%2C+A%2E%22">Drabent, A.</searchLink><br /><searchLink fieldCode="AR" term="%22de+Gasperin%2C+F%2E%22">de Gasperin, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Gürkan%2C+G%2E%22">Gürkan, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Hajduk%2C+M%2E%22">Hajduk, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Hale%2C+C%2E+L%2E%22">Hale, C. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Hoeft%2C+M%2E%22">Hoeft, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Jamrozy%2C+M%2E%22">Jamrozy, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Kunert-Bajraszewska%2C+M%2E%22">Kunert-Bajraszewska, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Kondapally%2C+R%2E%22">Kondapally, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Magliocchetti%2C+M%2E%22">Magliocchetti, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Mahatma%2C+V%2E+H%2E%22">Mahatma, V. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Mostert%2C+R%2E+I%2E+J%2E%22">Mostert, R. I. J.</searchLink><br /><searchLink fieldCode="AR" term="%22O'Sullivan%2C+S%2E+P%2E%22">O'Sullivan, S. P.</searchLink><br /><searchLink fieldCode="AR" term="%22Pajdosz-Śmierciak%2C+U%2E%22">Pajdosz-Śmierciak, U.</searchLink><br /><searchLink fieldCode="AR" term="%22Petley%2C+J%2E%22">Petley, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Pierce%2C+J%2E+C%2E+S%2E%22">Pierce, J. C. S.</searchLink><br /><searchLink fieldCode="AR" term="%22Prandoni%2C+I%2E%22">Prandoni, I.</searchLink><br /><searchLink fieldCode="AR" term="%22Schwarz%2C+D%2E+J%2E%22">Schwarz, D. J.</searchLink><br /><searchLink fieldCode="AR" term="%22Shulewski%2C+A%2E%22">Shulewski, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Siewert%2C+T%2E+M%2E%22">Siewert, T. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Stott%2C+J%2E+P%2E%22">Stott, J. P.</searchLink><br /><searchLink fieldCode="AR" term="%22Tang%2C+H%2E%22">Tang, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Vaccari%2C+M%2E%22">Vaccari, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Zheng%2C+X%2E%22">Zheng, X.</searchLink><br /><searchLink fieldCode="AR" term="%22Bailey%2C+T%2E%22">Bailey, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Desbled%2C+S%2E%22">Desbled, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Goyal%2C+A%2E%22">Goyal, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Gonano%2C+V%2E%22">Gonano, V.</searchLink><br /><searchLink fieldCode="AR" term="%22Hanset%2C+M%2E%22">Hanset, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Kurtz%2C+W%2E%22">Kurtz, W.</searchLink><br /><searchLink fieldCode="AR" term="%22Lim%2C+S%2E+M%2E%22">Lim, S. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Mielle%2C+L%2E%22">Mielle, L.</searchLink><br /><searchLink fieldCode="AR" term="%22Molloy%2C+C%2E+S%2E%22">Molloy, C. S.</searchLink><br /><searchLink fieldCode="AR" term="%22Roth%2C+R%2E%22">Roth, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Terentev%2C+I%2E+A%2E%22">Terentev, I. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Torres%2C+M%2E%22">Torres, M.</searchLink>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: A&A 678, A151 (2023)
– Name: DatePubCY
  Label: Publication Year
  Group: Date
  Data: 2023
– Name: Subset
  Label: Collection
  Group: HoldingsInfo
  Data: Astrophysics
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Astrophysics+of+Galaxies%22">Astrophysics - Astrophysics of Galaxies</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: The second data release of the LOFAR Two-Metre Sky Survey (LoTSS) covers 27% of the northern sky, with a total area of $\sim 5,700$ deg$^2$. The high angular resolution of LOFAR with Dutch baselines (6 arcsec) allows us to carry out optical identifications of a large fraction of the detected radio sources without further radio followup; however, the process is made more challenging by the many extended radio sources found in LOFAR images as a result of its excellent sensitivity to extended structure. In this paper we present source associations and identifications for sources in the second data release based on optical and near-infrared data, using a combination of a likelihood-ratio cross-match method developed for our first data release, our citizen science project Radio Galaxy Zoo: LOFAR, and new approaches to algorithmic optical identification, together with extensive visual inspection by astronomers. We also present spectroscopic or photometric redshifts for a large fraction of the optical identifications. In total 4,116,934 radio sources lie in the area with good optical data, of which 85% have an optical or infrared identification and 58% have a good redshift estimate. We demonstrate the quality of the dataset by comparing it with earlier optically identified radio surveys. This is by far the largest ever optically identified radio catalogue, and will permit robust statistical studies of star-forming and radio-loud active galaxies.<br />Comment: 29 pages. Accepted by A&A; data products available at https://lofar-surveys.org/dr2_release.html
– Name: TypeDocument
  Label: Document Type
  Group: TypDoc
  Data: Working Paper
– Name: DOI
  Label: DOI
  Group: ID
  Data: 10.1051/0004-6361/202347333
– Name: URL
  Label: Access URL
  Group: URL
  Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2309.00102" linkWindow="_blank">http://arxiv.org/abs/2309.00102</link>
– Name: AN
  Label: Accession Number
  Group: ID
  Data: edsarx.2309.00102
PLink https://login.libproxy.scu.edu/login?url=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edsarx&AN=edsarx.2309.00102
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1051/0004-6361/202347333
    Subjects:
      – SubjectFull: Astrophysics - Astrophysics of Galaxies
        Type: general
    Titles:
      – TitleFull: The LOFAR Two-Metre Sky Survey (LoTSS): VI. Optical identifications for the second data release
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Hardcastle, M. J.
      – PersonEntity:
          Name:
            NameFull: Horton, M. A.
      – PersonEntity:
          Name:
            NameFull: Williams, W. L.
      – PersonEntity:
          Name:
            NameFull: Duncan, K. J.
      – PersonEntity:
          Name:
            NameFull: Alegre, L.
      – PersonEntity:
          Name:
            NameFull: Barkus, B.
      – PersonEntity:
          Name:
            NameFull: Croston, J. H.
      – PersonEntity:
          Name:
            NameFull: Dickinson, H.
      – PersonEntity:
          Name:
            NameFull: Osinga, E.
      – PersonEntity:
          Name:
            NameFull: Röttgering, H. J. A.
      – PersonEntity:
          Name:
            NameFull: Sabater, J.
      – PersonEntity:
          Name:
            NameFull: Shimwell, T. W.
      – PersonEntity:
          Name:
            NameFull: Smith, D. J. B.
      – PersonEntity:
          Name:
            NameFull: Best, P. N.
      – PersonEntity:
          Name:
            NameFull: Botteon, A.
      – PersonEntity:
          Name:
            NameFull: Brüggen, M.
      – PersonEntity:
          Name:
            NameFull: Drabent, A.
      – PersonEntity:
          Name:
            NameFull: de Gasperin, F.
      – PersonEntity:
          Name:
            NameFull: Gürkan, G.
      – PersonEntity:
          Name:
            NameFull: Hajduk, M.
      – PersonEntity:
          Name:
            NameFull: Hale, C. L.
      – PersonEntity:
          Name:
            NameFull: Hoeft, M.
      – PersonEntity:
          Name:
            NameFull: Jamrozy, M.
      – PersonEntity:
          Name:
            NameFull: Kunert-Bajraszewska, M.
      – PersonEntity:
          Name:
            NameFull: Kondapally, R.
      – PersonEntity:
          Name:
            NameFull: Magliocchetti, M.
      – PersonEntity:
          Name:
            NameFull: Mahatma, V. H.
      – PersonEntity:
          Name:
            NameFull: Mostert, R. I. J.
      – PersonEntity:
          Name:
            NameFull: O'Sullivan, S. P.
      – PersonEntity:
          Name:
            NameFull: Pajdosz-Śmierciak, U.
      – PersonEntity:
          Name:
            NameFull: Petley, J.
      – PersonEntity:
          Name:
            NameFull: Pierce, J. C. S.
      – PersonEntity:
          Name:
            NameFull: Prandoni, I.
      – PersonEntity:
          Name:
            NameFull: Schwarz, D. J.
      – PersonEntity:
          Name:
            NameFull: Shulewski, A.
      – PersonEntity:
          Name:
            NameFull: Siewert, T. M.
      – PersonEntity:
          Name:
            NameFull: Stott, J. P.
      – PersonEntity:
          Name:
            NameFull: Tang, H.
      – PersonEntity:
          Name:
            NameFull: Vaccari, M.
      – PersonEntity:
          Name:
            NameFull: Zheng, X.
      – PersonEntity:
          Name:
            NameFull: Bailey, T.
      – PersonEntity:
          Name:
            NameFull: Desbled, S.
      – PersonEntity:
          Name:
            NameFull: Goyal, A.
      – PersonEntity:
          Name:
            NameFull: Gonano, V.
      – PersonEntity:
          Name:
            NameFull: Hanset, M.
      – PersonEntity:
          Name:
            NameFull: Kurtz, W.
      – PersonEntity:
          Name:
            NameFull: Lim, S. M.
      – PersonEntity:
          Name:
            NameFull: Mielle, L.
      – PersonEntity:
          Name:
            NameFull: Molloy, C. S.
      – PersonEntity:
          Name:
            NameFull: Roth, R.
      – PersonEntity:
          Name:
            NameFull: Terentev, I. A.
      – PersonEntity:
          Name:
            NameFull: Torres, M.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 31
              M: 08
              Type: published
              Y: 2023
ResultId 1