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Excited-state hydroxyl maser catalogue from the methanol multibeam survey - 1. Positions and variability

Citation

Avison, A and Quinn, LJ and Fuller, GA and Caswell, JL and Green, JA and Breen, SL and Ellingsen, SP and Gray, MD and Pestalozzi, M and Thompson, MA and Voronkov, MA, Excited-state hydroxyl maser catalogue from the methanol multibeam survey - 1. Positions and variability, Monthly Notices of the Royal Astronomical Society, 461, (1) pp. 136-155. ISSN 0035-8711 (2016) [Refereed Article]


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This article has been accepted for publication in Royal Astronomical Society. Monthly Notices ©: 2016 the authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnras/stw1101

Abstract

We present the results of the first complete unbaised survey of the Galactic plane for 6035-MHz excited-state hydroxyl (ex-OH) masers undertaken as part of the methanol multibeam (MMB) survey. These observations cover the Galactic longitude ranges 186° < l < 60° including the Galactic Centre. We report the detection of 127 ex-OH masers within the survey region, 47 being new sources. The positions of new detections were determined from interferometric observations with the Australia Telescope Compact Array. We discuss the association of 6035-MHz masers in our survey with the 6668-MHz masers from the MMB Survey, finding 37 likely CH3OH–ex-OH maser pairs with physical separations of ≤0.03 pc and 55 pairings separated by ≤0.1 pc. Using these we calculate for the first time an ex-OH maser lifetime of between 3.3 × 103 and 8.3 × 103 yr. We also discuss the variability of the 6035-MHz masers and detection rates of counterpart 6030-MHz ex-OH masers (28 per cent of our sample having detection at both frequencies).

Item Details

Item Type:Refereed Article
Keywords:masers, surveys, stars: formation, ISM: molecules, galaxy: structure
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:110435
Year Published:2016
Web of Science® Times Cited:7
Deposited By:Mathematics and Physics
Deposited On:2016-07-27
Last Modified:2017-11-03
Downloads:94 View Download Statistics

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