Apertif DR1 - 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. This first data release includes observations in the
first year of survey operations, from 1 July 2019 through 30 June
2020. The data release includes all raw observational data for a total
of 221 observations of 160 independent target fields, covering
approximately one thousand square degrees of sky. A subset of
processed data products, meeting specified quality assessment criteria
as outlined in Adams et al. (2022), are also released. Images and
cubes are released on a per beam basis, and 3374 beams (of 7640
considered) are included in this data release. The processed data
products are only available for the upper 150 MHz of the band over the
range 1280–1430 MHz. The first 12.5 MHz of data are flagged due to
persistent RFI resulting in a nominal bandwidth of 137.5 MHz and
central frequency of 1361.25 MHz. The data products are not
primary-beam corrected, however the primary-beam images are provided
separately that may be used for mosaicking or for correction of
individual images. This service queries the continuum images from the
first 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_dr1/q/apertif_dr1_catalogue/form).
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