Astrophys. J., Suppl. Ser., 254, 36-36 (2021/June-0)
The Southern H II Region Discovery Survey. II. The full catalog.
WENGER T.V., DAWSON J.R., DICKEY J.M., JORDAN C.H., McCLURE-GRIFFITHS N.M., ANDERSON L.D., ARMENTROUT W.P., BALSER D.S. and BANIA T.M.
Abstract (from CDS):
The Southern H II Region Discovery Survey (SHRDS) is a 900 hr Australia Telescope Compact Array 4-10 GHz radio continuum and radio recombination line (RRL) survey of Galactic H II regions and infrared-identified H II region candidates in the southern sky. For this data release, we reprocess all previously published SHRDS data and include an additional ∼450 hr of observations. The search for new H II regions is now complete over the range 259° < l < 346°, |b| < 4° for H II region candidates with predicted 6 GHz continuum peak brightnesses >=30 mJy beam–1. We detect radio continuum emission toward 730 targets altogether including previously known nebulae and H II region candidates. By averaging ∼18 RRL transitions, we detect RRL emission toward 206 previously known H II regions and 436 H II region candidates. Including the northern sky surveys, over the last decade the H II Region Discovery Surveys have more than doubled the number of known Galactic H II regions. The census of H II regions in the Wide-field Infrared Survey Explorer (WISE) Catalog of Galactic H II Regions is now complete for nebulae with 9 GHz continuum flux densities >=250 mJy. We compare the RRL properties of the newly discovered SHRDS nebulae with those of all previously known H II regions. The median RRL FWHM line width of the entire WISE Catalog H II region population is 23.9 km s–1 and is consistent between Galactic quadrants. The observed Galactic longitude-velocity asymmetry in the population of H II regions probably reflects underlying spiral structure in the Milky Way.
© 2021. The American Astronomical Society. All rights reserved.
H II regions - Surveys - Radio spectroscopy - Radio continuum emission - Galaxy structure - Milky Way dynamics - Milky Way Galaxy - Interstellar medium
Status at CDS
Large table(s) of objects being ingested in VizieR.
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