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- in query form say we use the default but more can be found using the service info and topcat/pyvo.
Introduction
This page describes access to the data in ASTRON's data holdings using the Virtual Observatory standards. Those standards support access to data like catalogs and images. We introduce the most important standards on this page and give some usage examples tailored to the ASTRON data holdings. If you want more advanced information on how to use the VO standards, you can start with the IVOA website for astronomers and the IVOA wiki page on educational resources. For our data holdings we use the DAta Center Helper Suite (DACHS), which offers a web interface of its own. We will link to several places in DACHS in the documentation but in principle all information showed by DACHS can also be accessed using any VO tools.
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| Service name | Type | Table name | Service description | Service info |
|---|---|---|---|---|
| ADQL Query | system | N/A | This provides a form that can be used to perform ADQL queries and get results in different formats. | info (no columns) |
| LBCS Calibrator Search | catalogue | lbcs.main | Catalog of calibrators from the | info |
| LoLSS - Image Cutout Service | image cutout | lolss.mosaic | info | |
| LoLSS source catalog | catalogue | lolss.source_catalog | Source catalogue of the | info |
| LoTSS-DR1 Cross-Matched Source Catalogue | catalogue | hetdex.main_merged | info | |
| LoTSS-DR1 Image Archive | image | hetdex.hetdex_images | Images of the . | info |
| LoTSS-DR1 Image Cutout Service | image cutout | hetdex.hetdex_images | Cutouts from the images of the . | info |
| LoTSS-DR1 Raw Radio Catalogue Cone Search | catalogue | hetdex.main | info | |
| catalogue | lotss_dr2.main_gausses | Catalogue of the s. | info | |
| LoTSS-DR2 Source catalog cone search | catalogue | lotss_dr2.main_sources | Catalogue of the | info |
| LoTSS-DR2 mosaics | image | lotss_dr2.mosaics | . | info |
| LoTSS-PDR Image Archive | image | lofartier1.img_main | Images of the . | info |
| LoTSS-PDR Image Cutout Service | image cutout | lofartier1.img_main | Cutouts from the images of the . | info |
| LoTSS-PDR Source Catalogue | catalogue | lofartier1.main | info | |
| M) Apertif DR1 - Continuum images | image | apertif_dr1.continuum_images | Continuum images of the Apertif First Data Release (Apertif DR1). | info |
| M) Apertif DR1 - HI spectral cubes | cube | apertif_dr1.spectral_cubes | HI spectral cubes of the Apertif First Data Release (Apertif DR1). | info |
| M) Apertif DR1 - Polarization images and cubes | image/cube | apertif_dr1.pol_cubes | Stokes V image and Stokes Q and U cubes of the Apertif First Data Release (Apertif DR1). | info |
| MSSS Verification Field Images | image | mvf.msssvf_img_main | info | |
| MSSS Verification Field Sources | catalogue | mvf.main | info | |
| S) Apertif DR1 - Field calibrated visibilities | catalogue | apertif_dr1.calibrated_visibilities | Catalogue of the properties from the calibrated visibilities of the fields from the Apertif First Data Release (Apertif DR1). | info |
| S) Apertif DR1 - Field raw visibilities | catalogue | apertif_dr1.raw_visibilities | Catalogue of the properties from the raw visibilities of the fields from the from the Apertif First Data Release (Apertif DR1). | info |
| S) Apertif DR1 - Flux calibrator raw visibilities | catalogue | apertif_dr1.flux_cal_visibilities | Catalogue of the properties from the calibrated visibilities of the flux calibrators from the Apertif First Data Release (Apertif DR1). | info |
| S) Apertif DR1 - Pol. calibrator raw visibilities | catalogue | apertif_dr1.pol_cal_visibilities | Catalogue of the properties from the calibrated visibilities of the polarisation calibrators from the Apertif First Data Release (Apertif DR1). | info |
| SAURON HI Survey Images | image | sauron.mom0 | info | |
| SAURON HI Survey Velocity Fields | image | sauron.main | info | |
| TGSSADR Image Archive | image | tgssadr.img_main | Images of the | info |
| TGSSADR Image Cutout Service | image cutout | tgssadr.img_main | Cutouts from the images of the | info |
| TGSSADR Source Catalogue | catalogue | tgssadr.main | Catalogue of the radio sources in the . | info |
| The VO @ ASTRON TAP service | system | N/A | (info only): description on how to access the tables using the TAP protocol. | info (no columns) |
| Apertif DR1 beam cubes (table only, no service) | apertif_dr1.beam_cubes | Beam cubes from the Apertif First Data Release (Apertif DR1), no connected service but accessible via TAP and linked from the other Apertif DR1 tables through DataLink. | N/A |
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The VO data collections can easily be the Apertif DR1 data collection tables can be accessed using TOPCAT, an interactive graphical viewer and editor for tabular data. Since the ASTRON VO is registered to the so-called registry of registries, TOPCAT can find the relevant services in its query menus. In the VO menu of TOPCAT you can pick the SIA query menu item, which will bring up a form as shown in Fig. 5. When selecting one of the data collections the SIA URL will be automatically filled in. One can then either type coordinates, or an object name and click the "Resolve" button which uses Simbad to obtain coordinates for that object. When clicking OK, a table of the data products found will appear in the main TOPCAT window. Alternatively, the table can be saved in various formats and used locally with other programs (e.g. python scripts etc).
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Overview
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