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Resource Record Summary

Image Service:
LoTSS-DR2 mosaics
https://repository.surfsara.nl/api/objects/collection/lotss-dr2/thumbnail[Logo URL]
Short name: "Mosaics"
IVOA Identifier: ivo://astron.nl/lotss_dr2/q/query_mosaicsPublisher: ASTRON
More Info: https://vo.astron.nl/lotss_dr2/q/query_mosaics/info
VO Compliance: Level 2: This is a VO-compliant resource.		 Status: active
Registered: 2021 Aug 25 00:00:00Z
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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. This service queries the Stokes I continuum mosaic images.

More About this Resource

About the Resource Providers

This section describes who is responsible for this resource

Publisher: ASTRON

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

Contact Information:
X Michael Sipior
Email: vo at astron.nl
Address: Oude Hoogeveensedijk 4
7991PD Dwingeloo
the Netherlands

Status of This Resource

This section provides some status information: the resource version, availability, and relevant dates.

Version: n/a
Availability: This is an active resource.
 Relevant dates for this Resource:
  • Updated: 2023 Sep 28 14:12:45

This resource was registered on: 2021 Aug 25 00:00:00Z
This resource description was last updated on: 2023 Sep 28 14:12:45Z
What This Resource is About

This section describes what the resource is, what it contains, and how it might be relevant.

Resource Class: CatalogService
This resource is a service that provides access to data (specifically, images). With this type of service, you can search for data by issuing a query, and information about available data is returned as a table.
Resource type keywords:
  • Survey
 Subject keywords:
  • radio continuum: general, techniques: image processing
This service provides data from:
  • facility: LOFAR
  • instrument: LOFAR.HBA
Intended audience or use:
  • Research: This resource provides information appropriate for supporting scientific research.
More Info: https://vo.astron.nl/lotss_dr2/q/query_mosaics/info Literature Reference: 2022A&A...659A...1S

Related Resources:

Services that provide access to data in this resource:
The VO @ ASTRON TAP service ivo://astron.nl/tap [Res. ID]

Data Coverage Information

This section describes the data's coverage over the sky, frequency, and time.

Wavebands covered:

  • Radio
Rights and Usage Information

This section describes the rights and usage information for this data.

Rights: http://creativecommons.org/licenses/by-sa/3.0/
Licensed under CC-BY-SA

Available Service Interfaces

Simple Image AccessXX

This is a standard IVOA service used to search for images from this resource that overlap with a specified region of the sky.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for the standard interface:
  • https://vo.astron.nl/lotss_dr2/q/query_mosaics/siap.xml?
Image service type: Pointed: pre-computed non-survey images will be returned.
Maximum query region accepted:
Maximum region size returned:
Maximum image size returned:
Maximum image size returned:
Maximum number of matching records returned: 1000000
VOSI AvailabilityXX

This is a standard IVOA service endpoint that returns information about the availability and uptime of the main IVOA standard service.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for the standard interface:
VOSI CapabilitiesXX

This is a standard IVOA service endpoint that returns the detailed capabilities of the main IVOA standard service.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for the standard interface:
VOSI TablesXX

This is a standard IVOA service endpoint that returns information about the table schema managed by the main IVOA standard service.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for the standard interface:
Table Access Protocol - Auxiliary ServiceXX

This is a standard IVOA service that takes as input an ADQL or PQL query and returns tabular data.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for the standard interface:
  • https://vo.astron.nl/tapX(version 1.1 compatible)
Custom Service

This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for this service interface:
  • URL-based interface: https://vo.astron.nl/lotss_dr2/q/dlmosaic/dlmeta
    • Role: std
    • This interface supports the following arguments:
      ID
      The pubisher DID of the dataset of interest
      Value Type: char
      Unified Content Descriptor (UCD): meta.id;meta.main
      RESPONSEFORMAT
      File format requested for output.
      Value Type: char
      Unified Content Descriptor (UCD): meta.code.mime
      MAXREC
      Maximum number of records returned. Pass 0 to retrieve service parameters.
      Value Type: integer
      VERB
      Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns.
      Value Type: integer

Developed with the support of the National Science Foundation
under Cooperative Agreement AST0122449 with the Johns Hopkins University
The NAVO project is a member of the International Virtual Observatory Alliance

This NAVO Application is hosted by the Space Telescope Science Institute
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