Information on resource 'Apertif DR-2'

Services defined within this resource descriptor

• Apertif DR-2

  This datalink service gives all data products related to the selected continuum image.

• Apertif DR-2

  This datalink service gives all data products related to the selected polarization cube.

• Apertif DR-2

  This datalink service gives all data products related to the selected spectral cube.

• Apertif DR2 - Continuum images

  Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. This service queries the continuum images from the second data release of Apertif. Multi-frequency synthesis (mfs) Stokes I images are produced over the full frequency range (1292.5– 1430 MHz) and saved as fits files for each beam. The size of the continuum images is 3.4 deg × 3.4 deg (3073 × 3073 pixels, with 4''/pixel). The median noise in the continuum images is 41.4 uJy/beam and the median angular resolution is 11.6''/sin(declination). A companion VO table provides a continuum source catalog based on all continuum images contained in this data release and is described in Kutkin et al. (2022) (see https://vo.astron.nl/apertif_dr2/q/apertif_dr2_catalogue/form).

• Apertif DR2 - Field calibrated visibilities

  Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. This service queries the calibrated visibility measurement sets. The calibrated visibility data, with cross-calibration and self-calibration solutions applied, are currently stored as an intermediate data product at full time and spectral resolution. These are stored on tape with the raw data and are not immediately available for download. The data release documentation should be consulted for up-to-date information on how to access the data.

• Apertif DR2 - Field raw visibilities

  Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. The raw visibility data are provided as separate collections for the survey fields, flux calibrator and polarization calibrator observations. The tables can be joined to identify the associated calibrators for a target observation. This service queries the raw visibilities for the survey fields. These are stored on tape and are not immediately available for download. The data release documentation should be consulted for up-to-date information on how to access the data.

• Apertif DR2 - Flux calibrator raw visibilities

  Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. The raw visibility data are provided as separate collections for the survey fields, flux calibrator and polarization calibrator observations. The tables can be joined to identify the associated calibrators for a target observation. This service queries the raw visibilities for the flux calibrator. These are stored on tape and are not immediately available for download. The data release documentation should be consulted for up-to-date information on how to access the data.

• Apertif DR2 - HI spectral cubes

  Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. This service queries the spectral line cubes from the second data release of Apertif. Four line cubes are produced over a set of different frequency ranges as follows. Cube 0:  1292.5–1337.1 MHz, Cube 1: 1333.1–1377.7 MHz, Cube 2: 1373.8–1418.4 MHz, Cube 3: 1414.5–1429.3 MHz. Cube 3 is produced at full spectral resolution of 12.2 kHz while other cubes are produced with a 3-channel averaging at 36.6 kHz resolution. The cubes have a spatial extent of 1.1 deg × 1.1 deg (661 × 661 pixels, with 6''/pixel). The median noise for all line cubes, with a spectral resolution of 36.6 kHz, is 1.6 mJy/beam, corresponding to a 3-σ H I column density sensitivity of 1.8 × 10^20 atoms cm^−2 over 20 km s^−1 (for a median angular resolution of 24″ × 15″). The corresponding dirty beam cubes are also released to allow offline cleaning of source emission.

• Apertif DR2 - Polarization calibrator raw visibilities

  Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. The raw visibility data are provided as separate collections for the survey fields, flux calibrator and polarization calibrator observations. The tables can be joined to identify the associated calibrators for a target observation. This service queries the raw visibilities for the polarization calibrator. These are stored on tape and are not immediately available for download. The data release documentation should be consulted for up-to-date information on how to access the data.

• Apertif DR2 - Polarization cubes

  Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. This service queries the polarization cubes from the second data release of Apertif. In order to prevent bandwidth depolarization and enable rotation measure synthesis studies, Stokes Q and U cubes with a frequency resolution of 6.25 MHz are produced. The cubes have a smaller spatial extent of 2.7 deg × 2.7 deg (2049 × 2049 pixels, with 4''/pixel ) than the continuum or Stokes V images but still extend well beyond the primary beam.

• Visibilitiy access link

Tables defined within this resource descriptor

• apertif_dr2.beam_cubes – queriable through TAP and ADQL
• apertif_dr2.calibrated_visibilities – queriable through TAP and ADQL
• apertif_dr2.continuum_images – queriable through TAP and ADQL
• apertif_dr2.flux_cal_visibilities – queriable through TAP and ADQL
• apertif_dr2.pol_cal_visibilities – queriable through TAP and ADQL
• apertif_dr2.pol_cubes – queriable through TAP and ADQL
• apertif_dr2.raw_visibilities – queriable through TAP and ADQL
• apertif_dr2.spectral_cubes – queriable through TAP and ADQL

Copyright, License, Acknowledgements

If you use this data, cite Adams et al. 2022 (2022A&A...667A..38A). Additionally, you can cite the service reference. The Apertif data release 2 is licensed under the Creative Commons Attribution 3.0 License

[Manage RD]