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    Accurate OH maser positions from the SPLASH pilot region

    250321.pdf (4.817Mb)
    Access Status
    Open access
    Authors
    Qiao, H.
    Walsh, Andrew
    Green, J.
    Breen, S.
    Dawson, J.
    Ellingsen, S.
    Gómez, J.
    Jordan, Christopher
    Shen, Z.
    Lowe, V.
    Jones, P.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Qiao, H. and Walsh, A. and Green, J. and Breen, S. and Dawson, J. and Ellingsen, S. and Gómez, J. et al. 2016. Accurate OH maser positions from the SPLASH pilot region. Astrophysical Journal Supplement Series. 227: 26.
    Source Title
    Astrophysical Journal Supplement Series
    DOI
    10.3847/1538-4365/227/2/26
    ISSN
    0067-0049
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    Copyright © 2016 The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/50638
    Collection
    • Curtin Research Publications
    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. © 2016. The American Astronomical Society. All rights reserved.

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