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133322 - The Southern H II Region Discovery Survey. I - the Bright Catalog.pdf (2.78 MB)

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

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posted on 2023-05-20, 04:25 authored by Wenger, TV, John DickeyJohn Dickey, Jordan, CH, Balser, DS, Armentrout, WP, Anderson, LD, Bania, TM, Dawson, JR, McClure-Griffiths, NM, Shea, J
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.

History

Publication title

Astrophysical Journal, Supplement Series

Volume

240

Article number

24

Number

24

Pagination

1-19

ISSN

0067-0049

Department/School

School of Natural Sciences

Publisher

Univ Chicago Press

Place of publication

1427 E 60Th St, Chicago, USA, Il, 60637-2954

Rights statement

Copyright 2019 The American Astronomical Society

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the physical sciences

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