Staveley-Smith et al. present spectral-line results from the new cryogenic phased array feed (cryoPAF) on Murriyang, the Parkes radiotelescope. The cryoPAF offers a significant improvement in field of view, aperture efficiency, bandwidth, chromaticity and survey speed compared with conventional horn-fed receivers. This is demonstrated with measurements of sky calibrators and observations of 21-cm neutral hydrogen (HI) in the Large Magellanic Cloud (LMC) and the nearby galaxy NGC 6744.

CryoPAF commissioning data for this paper were taken on 2024 November 18 for the Large Magellanic Cloud (LMC). The LMC data consist of 66 minutes of azimuth-elevation tracks of 49 discrete pointing centres with all 72 beams, i.e. ∼80 sec per pointing. A 230 MHz bandwidth between 1300 to 1530 MHz was used with a frequency resolution of 4.4 kHz. Within that band, a zoom band covering 1417.5 ± 7.5 MHz was used for the LMC, with a zoom band frequency resolution of 0.55 kHz (0.12 km/s). The image above shows RGB images of neutral hydrogen emission in the LMC from 165.9 to 318.2 km/s (barycentric) in chunks of width 38 km/s. Each colour channel has a width of 12.7 km/s, with the blue channel starting at the lowest velocity in each image. The features, positions and column densities show good agreement with previous multibeam images