This service queries the HI spectral cubes 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 in the Apertif DR1 dataproducts description . In this service query, for each observation there are four line sets of cubes of four different frequency ranges (1292.5-1337.1 MHz, 1333.1-1377.7 MHz, 1373.8-1418.4 MHz and 1414.5-1429.3 MHz). Each cube is saved as a fits file for each beam. These images are 1.1°×1.1°(661×661 pixels, with 6′′/pixel). The angular resolution of the imaging survey observations is ∼ 15′′×15′′/sin(δ). Please find more details in the Apertif DR1 Documentation.

• 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