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Accurate OH maser positions from the SPLASH Survey. III. The final 96 deg2

Citation

Qiao, H-H and Breen, SL and Gomez, JF and Dawson, JR and Walsh, AJ and Green, JA and Ellingsen, SP and Imai, H and Shen, Z-Q, Accurate OH maser positions from the SPLASH Survey. III. The final 96 deg2, The Astrophysical Journal Supplement Series, 247, (1) Article 5. ISSN 0067-0049 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 The American Astronomical Society

DOI: doi:10.3847/1538-4365/ab655d

Abstract

We present high spatial resolution observations of ground-state OH masers achieved with the Australia Telescope Compact Array (ATCA). These observations targeted 253 pointing centers containing OH maser candidates at all four ground-state OH transitions identified in the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH) across 96 deg2 of the southern Galactic plane (332 < l < 334 and −2 < b < +2, 344 < l < 355 and −2 < b < +2, 358 < l < 4 and +2 < b < +6, 5 < l < 10 and −2 < b < +2). We detect maser emission toward 236 fields and suggest that 7 out of 17 nondetections are due to the slightly lower sensitivity of the ATCA observations, combined with some temporal variability. The superior resolution provided by the ATCA data has allowed us to identify 362 OH maser sites in the 236 target fields. Almost half (160 of 362) of these masers have been detected for the first time. Comparison between these 362 maser sites and information presented in the literature allowed us to categorize 238 sites as evolved star sites (66%), 63 as star formation (17%), 8 as supernova remnants, and 53 as unknown maser sites (15%). We present an analysis of the OH masers across the full SPLASH survey range (176 deg2) and find that the detection rate of 1.7 GHz radio continuum sources (18%) is lower than that previously found at 8.2 and 9.2 GHz (38%). We also find that the velocity separations of evolved star sites with symmetric 1612 MHz maser profiles are generally smaller than those with asymmetric profiles.

Item Details

Item Type:Refereed Article
Keywords:catalogs, interstellar molecules, circumstellar masers, interstellar masers, star formation, asymptotic giant branch stars, post-asymptotic giant branch
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:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:140102
Year Published:2020
Web of Science® Times Cited:3
Deposited By:Physics
Deposited On:2020-07-27
Last Modified:2020-08-25
Downloads:0

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