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A Survey for Hydroxyl in the THOR Pilot Region around W43

Walsh, AJ and Beuther, H and Bihr, S and Johnston, KG and Dawson, JR and Ott, J and Longmore, SN and Luong, QN and Klessen, RS and Ragan, S and McClure-Griffiths, N and Brunthaler, A and Urquhart, J and Menten, K and Bigiel, F and Wyrowski, F and Rugel, M (2016) A Survey for Hydroxyl in the THOR Pilot Region around W43. Monthly Notices of the Royal Astronomical Society, 455 (4). pp. 3494-3510. ISSN 0035-8711

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Abstract

We report on observations of the hydroxyl radical (OH) within The H{\sc I}, OH Recombination line survey (THOR) pilot region. The region is bounded approximately between Galactic coordinates l=29.2 to 31.5$^\circ$ and b=-1.0 to +1.0$^\circ$ and includes the high-mass star forming region W43. We identify 103 maser sites, including 72 with 1612\,MHz masers, 42 showing masers in either of the main line transitions at 1665 and 1667\,MHz and four showing 1720\,MHz masers. Most maser sites with either main-line or 1720\,MHz emission are associated with star formation, whereas most of the 1612\,MHz masers are associated with evolved stars. We find that nearly all of the main-line maser sites are co-spatial with an infrared source, detected by GLIMPSE. We also find diffuse OH emission, as well as OH in absorption towards selected unresolved or partially resolved sites. Extended OH absorption is found towards the well known star forming complex W43 Main.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (February 01, 2016) 455 (4): 3494-3510 is available online at http://dx.doi.org/10.1093/mnras/stv2446
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 28 Oct 2015 09:47
Last Modified: 30 Mar 2016 14:20
URI: http://researchonline.ljmu.ac.uk/id/eprint/2248

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