This service queries the raw visibilities of the polarization calibrator of the Apertif DR1 data collection. This data release contains continuum images, HI cubes, polarization cubes and other ancillary data (e.g. raw and calibrated visibilities). The imaging survey is split into two tiers: a wide-shallow tier consisting of a single observation per field and a medium-deep tier consisting of ten observations per field. The imaging survey footprint can be found in the Imaging Survey overview while the area covered by the DR1 can be found Apertif DR1 dataproducts description In this service query provides for each polarization calibrator the raw visibilities in MS format. These are observed at the central frequency of 1280 MHz, covering a bandwidth of 300 MHz and a frequency resolution of 12.2 kHz. Please find more details the Apertif DR1 documentation.

• HI line
• radio

• Papers making use of this data should include the following acknowledgement:

  This work makes use of data from the Apertif system installed at the Westerbork Synthesis Radio Telescope owned by ASTRON. ASTRON, the Netherlands Institute for Radio Astronomy, is an institute of the Dutch Research Council (“De Nederlandse Organisatie voor Wetenschappelijk Onderzoek, NWO).

  In addition, they should include the Apertif DR1 PID:

  http://hdl.handle.net/21.12136/B014022C-978B-40F6-96C6-1A3B1F4A3DB0

  and cite the imaging survey data release paper. This is not yet available but should be soon. Until then, it can be referenced as:

  Adams, E. A. K., et al. "First release of Apertif imaging survey data", in prep.

• https://www.astron.nl/telescopes/wsrt-apertif/apertif-dr1-documentation/data-access/data-usage-policy
• Licensed under CC-BY
• http://creativecommons.org/licenses/by/3.0/

APERTIF-DR1 is licensed under the Creative Commons Attribution 3.0 License