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The Southern H Region Discovery Survey. I: the Bright Catalog


Wenger, TV and Dickey, JM and Jordan, CH and Balser, DS and Armentrout, WP and Anderson, LD and Bania, TM and Dawson, JR and McClure-Griffiths, NM and Shea, J, The Southern H Region Discovery Survey. I: the Bright Catalog, Astrophysical Journal, Supplement Series, 240, (2) Article 24. ISSN 0067-0049 (2019) [Refereed Article]


Copyright Statement

Copyright 2019 The American Astronomical Society

DOI: doi:10.3847/1538-4365/aaf8ba


The census of Galactic H regions is vastly incomplete in the southern sky. We use the Australia Telescope Compact Array to observe 4-10 radio continuum and hydrogen radio recombination line (RRL) emission from candidate H regions in the Galactic zone 250 < 𝓁 < 344,|b|4. In this first data release, we target the brightest H region candidates and observe 282 fields in the direction of at least one previously known or candidate H region. We detect radio continuum emission and RRL emission in 275 (97.5%) and 258 (91.5%) of these fields, respectively. We catalog the ∼7 GHz radio continuum peak flux densities and positions of 80 previously known and 298 candidate H regions. After averaging ∼18 RRL transitions, we detect 77 RRL velocity components toward 76 previously known H regions and 267 RRL velocity components toward 256 H region candidates. The discovery of RRL emission from these nebulae increases the number of known Galactic H regions in the surveyed zone by 82% to 568 nebulae. In the fourth quadrant, we discover 50 RRLs with positive velocities, placing those sources outside the solar circle. Including the pilot survey, the Southern H Region Discovery Survey has now discovered 295 Galactic H regions. In the next data release, we expect to add ∼200 fainter and more distant nebulae.

Item Details

Item Type:Refereed Article
Keywords:galaxy: kinematics and dynamics - galaxy: structure - (ISM:) Hii regions - ISM: kinematics and dynamics - radio lines: ISM - surveys, radio astronomy
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
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:133222
Year Published:2019
Web of Science® Times Cited:13
Deposited By:Mathematics and Physics
Deposited On:2019-06-19
Last Modified:2020-05-20
Downloads:18 View Download Statistics

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