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Accurate OH maser positions from the SPLASH pilot region

Citation

Qiao, HH and Walsh, AJ and Green, JA and Breen, SL and Dawson, JR and Ellingsen, SP and Gomez, JF and Jordan, CH and Shen, ZQ and Lowe, V and Jones, PA, Accurate OH maser positions from the SPLASH pilot region, The Astrophysical Journal Supplement Series, 227, (2) Article 26. ISSN 0067-0049 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 The American Astronomical Society

DOI: doi:10.3847/1538-4365/227/2/26

Abstract

We report on high spatial resolution observations, using the Australia Telescope Compact Array (ATCA), of ground-state OH masers. These observations were carried out toward 196 pointing centers previously identified in the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH) pilot region, between Galactic longitudes of 334 and 344 and Galactic latitudes of −2 and +2. Supplementing our data with data from the MAGMO (Mapping the Galactic Magnetic field through OH masers) survey, we find maser emission toward 175 of the 196 target fields. We conclude that about half of the 21 nondetections were due to intrinsic variability. Due to the superior sensitivity of the followup ATCA observations, and the ability to resolve nearby sources into separate sites, we have identified 215 OH maser sites toward the 175 fields with detections. Among these 215 OH maser sites, 111 are new detections. After comparing the positions of these 215 maser sites to the literature, we identify 122 (57%) sites associated with evolved stars (one of which is a planetary nebula), 64 (30%) with star formation, two sites with supernova remnants, and 27 (13%) of unknown origin. The infrared colors of evolved star sites with symmetric maser profiles tend to be redder than those of evolved star sites with asymmetric maser profiles, which may indicate that symmetric sources are generally at an earlier evolutionary stage.

Item Details

Item Type:Refereed Article
Keywords:catalogs, ISM: molecules, masers, radio lines: ISM, stars: AGB and post-AGB, stars: formation
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:113244
Year Published:2016
Deposited By:Mathematics and Physics
Deposited On:2016-12-16
Last Modified:2017-05-09
Downloads:10 View Download Statistics

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