The Southern HII Region Discovery Survey. II. The Full Catalog
Trey V. Wenger, J. R. Dawson, John M. Dickey, C. H. Jordan, N. M., McClure-Griffiths, L. D. Anderson, W. P. Armentrout, Dana S. Balser, T. M., Bania

TL;DR
The paper presents a comprehensive catalog of Galactic HII regions from the Southern HII Region Discovery Survey, significantly increasing the known population and providing detailed radio observations to enhance understanding of Galactic structure.
Contribution
It provides the full catalog of HII regions in the southern sky, including new discoveries and detailed radio properties, completing the census for certain flux ranges.
Findings
Detected radio emission toward 730 targets including known and candidate HII regions.
Detected RRL emission toward 642 targets, doubling the known Galactic HII regions.
Confirmed the median RRL line width of 23.9 km/s across the population.
Abstract
The Southern HII Region Discovery Survey (SHRDS) is a 900 hour Australia Telescope Compact Array 4-10 GHz radio continuum and radio recombination line (RRL) survey of Galactic HII regions and infrared-identified HII region candidates in the southern sky. For this data release, we reprocess all previously published SHRDS data and include an additional ~450 hours of observations. The search for new HII regions is now complete over the range 259 deg < Galactic longitude < 346 deg, |Galactic latitude| < 4 deg for HII region candidates with predicted 6 GHz continuum peak brightnesses >30 mJy/beam. We detect radio continuum emission toward 730 targets altogether including previously known nebulae and HII region candidates. By averaging ~18 RRL transitions, we detect RRL emission toward 206 previously known HII regions and 436 HII region candidates. Including the northern sky surveys, over the…
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