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The Southern H II region discovery Survey. II. The Full Catalog


Wenger, TV and Dawson, JR and Dickey, JM and Jordan, CH and McClure-Griffiths, NM and Anderson, LD and Armentrout, WP and Balser, DS and Bania, TM, The Southern H II region discovery Survey. II. The Full Catalog, Astrophysical Journal, Supplement Series, 254, (2) Article 36. ISSN 0067-0049 (2021) [Refereed Article]

Copyright Statement

2021. The American Astronomical Society. All rights reserved.

DOI: doi:10.3847/1538-4365/abf4d4


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.

Item Details

Item Type:Refereed Article
Keywords:Galaxy: kinematics and dynamics; Galaxy: structure- (ISM:) H ii regions; ISM: kinematics and dynamics; radio lines: ISM; surveys
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Astronomical sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:152458
Year Published:2021
Web of Science® Times Cited:6
Deposited By:Physics
Deposited On:2022-08-19
Last Modified:2022-09-13

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