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The VO consists of several different protocols. In this section we describe the import ant protocols, and provide the acronyms that are generally used in the VO tooling. Most data in vo.astron.nl consist of tables, that can be accessed using the Tabular Access Protocol (TAP). Images are offered using the Simple Image Access Protocol (SIA) which in essence is a table with a field containing a link to an image. A few services offer cutout fuctionality (using SODA). A cutout is basically a service that returns an image (or more generally a data product) that only contains the data inside the cone that has been requested by the user.
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The data published in the VO can also be accessed using a web browser at https://vo.astron.nl. This web interface provides a page on which all the collections present in the registry are listed, including the published LoTSS DR2 data sets:
| Service name | Service Description | Type | Link to column descriptions |
|---|---|---|---|
| ADQL Query | Form to perform custom | system | |
| LBCS Calibrator Search | catalogue | ||
| LoLSS - Image Cutout Service | image cutout | ||
| LoLSS source catalog | catalogue | ||
| LoTSS-DR1 Cross-Matched Source Catalogue | catalogue | ||
| LoTSS-DR1 Image Archive | image | ||
| LoTSS-DR1 Image Cutout Service | image cutout | ||
| LoTSS-DR1 Raw Radio Catalogue Cone Search | catalogue | ||
| LoTSS-PDR Image Archive | image | ||
| LoTSS-PDR Image Cutout Service | image cutout | ||
| LoTSS-PDR Source Catalogue | catalogue | ||
| M) Apertif DR1 - Continuum images | image | ||
| M) Apertif DR1 - HI spectral cubes | cube | ||
| M) Apertif DR1 - Polarization images and cubes | image/cube | ||
| MSSS Verification Field Images | image | ||
| MSSS Verification Field Sources | catalogue | ||
| S) Apertif DR1 - Field calibrated visibilities | catalogue | ||
| S) Apertif DR1 - Field raw visibilities | catalogue | ||
| S) Apertif DR1 - Flux calibrator raw visibilities | catalogue | ||
| S) Apertif DR1 - Pol. calibrator raw visibilities | catalogue | ||
| SAURON HI Survey Images | image | ||
| SAURON HI Survey Velocity Fields | image | ||
| TGSSADR Image Archive | image | ||
| TGSSADR Image Cutout Service | image cutout | ||
| TGSSADR Source Catalogue | catalogue | ||
| The VO @ ASTRON TAP service | system |
| Service name | Service Description | Type | Link to column descriptions |
|---|---|---|---|
LoTSS-DR2 Gaussian catalog cone search | catalog | info | |
| LoTSS-DR2 Source catalog cone search | |||
| LoTSS-DR2 mosaics | image |
The ObsCore table
One of the tables in vo.astron.nl is called ivoa.obscore. This table is a special table which follows the ObsCore standard defined by the IVOA.
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Selecting a data collection allows the user to perform a cone search through a webform (Fig. 40). The result is either a source or Gaussian list, or a table of data products of that given class overlapping a given pointing. The size of the continuum images as well as the cubes extend beyond the 10% primary beam level for cleaning the secondary lobes of bright offset sources. To ensure that the search is done in the area of maximum sensitivity the search is performed on a maxim radius of 0.75 degrees from the center (this represents the average value of where the sensitivity drops). This value can be modified using the Max distance from center. A different output with respect to the default can be customized using More output fields selection button.
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