The Rapid ASKAP Continuum Survey (RACS) VIII: Total intensity and circular polarisation images and catalogues at 887.5 MHz from RACS-low2

Le résumé fourni par la source

Abstract We present a new data release from the Rapid ASKAP Continuum Survey (RACS), a widefield snapshot radio survey conducted with the Australian SKA Pathfinder (ASKAP). This data release contains the second RACS epoch to make use of ASKAP’s low-frequency band, centred on 887.5 MHz with a bandwidth of 288 MHz, referred to as RACS-low2. This RACS-low2 data release includes both Stokes I and V imaging and catalogue data products covering the whole sky up to a declination of almost equals plus 48 Superscript ring ≈ + 48 ∘ $\approx+48^{\circ}$ . RACS-low2 largely follows the observation footprint of the first low-band epoch, though includes additional coverage in the Northern Hemisphere. The observation scheduling and data processing follow previous RACS epochs, making use of autonomous scheduling and holography-derived primary beam models. The Stokes I and V catalogues are derived from images with a median point-spread function (PSF) of 14.2 double prime times 11.8 double prime 14.2 ′ ′ × 11.8 ′ ′ $14.2^{\prime\prime} \times 11.8^{\prime\prime}$ and have median root-mean-square noise properties of almost equals 195 ≈ 195 $\approx 195$ and almost equals 163 mu ≈ 163 μ $\approx 163\,\unicode{x03BC}$ Jy PSF Superscript negative 1 − 1 $^{-1}$ , for the Stokes I and V images, respectively. The consolidated Stokes I catalogue contains 3 922 151 sources. We also constructed a catalogue of Stokes V sources by measuring Stokes V images at the Stokes I source positions. For the 221 Stokes V measurements above the estimated leakage and detection thresholds, we provide likely identifications, including detections of 61 radio stars, 85 pulsars, 43 AGN (many likely to be residual leakage), and one source that is not associated with a known astronomical object. These data products, including calibrated visibilities, images, source lists, and consolidated catalogues, are made publicly available through the CSIRO ASKAP Science Data Archive.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.