ASKAP Project AS108 GASKAP-HI Pilot Survey: SMC HI Emission Cube

Brief description

This collection contains a 3901x3471x220 pixel data cube consisting of ASKAP data of the neutral hydrogen (HI) emission in the SMC feathered with regridded Parkes data. This cube covers a LSRK velocity range of 40.0 km/s to 253.9 km/s at a spectral resolution of 0.98 km/s. The rms noise level in a single spectral channel is 1.1 K at an angular resolution of 30’’ with an individual pixel size of 7''. This rms level translates to a 5-sigma HI column density detection limit of 4.4e19 cm^-2 over a 20 km/s line width. These data were produced with a custom imaging pipeline that utilizes the joint deconvolution capabilities of WSClean, a third party software suite designed specifically for wide-field imaging, to ensure emission that extends across the boundaries of the ASKAP primary beams is accurately recovered. A multi-scale CLEAN algorithm was employed with scales ranging from 0, 4, 8, 16, 32, 64, 128, and 256 pixels. Other data products include a map of the primary beam response across the ASKAP field-of-view and an integrated intensity image computed over the velocity range of 235.4 km/s to 60.5 km/s. Please see PAPER PLACEHOLDER for comprehensive details on the calibration, imaging, and properties of these data.
Lineage: 10941, 10944