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26th of April 2022
The Southern Parkes Large-Area Survey in Hydroxyl (SPLASH)
by Dawson et al.
Dawson et al. have presented the full data release for the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH). SPLASH is the most sensitive large-scale survey of hydroxyl (OH) to-date. The survey of the Southern Galactic Plane was undertaken in all four ground-state transitions of the OH radical at 1612, 1665, 1667 and 1720 MHz with the Parkes 64m radio-telescope, "Murriyang". The survey covers the inner Galactic Plane, primarily within 2 degrees of the galactic plane and galactic longitudes between 332 degrees and 10 degrees, covering the Central Molecular Zone and Galactic Centre. The image above shows the SPLASH survey coverage, overlaid on the velocity integrated carbon monoxide (CO) distribution (grey shaded area). Each 2 × 2 degree square corresponds to a single SPLASH tile. The hatched zone indicates the previously piublished Pilot Region. Reference positions for each tile are shown as white-filled circles. Dotted lines join each reference position to its corresponding tile. Where deep observations were carried out to characterise low-level signal in the reference spectra, the corresponding reference position is shown as a grey-filled circle. The paper has been published in Monthly Notices of the Royal Astronomical Society.

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