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Co-propagation of maser emission at 1720 and 4765 MHz

Gray, MD; Cohen, RJ; Richards, AMS; Yates, JA; Field, D; (2001) Co-propagation of maser emission at 1720 and 4765 MHz. Monthly Notices of the Royal Astronomical Society , 324 (3) 643 - 647. 10.1046/j.1365-8711.2001.04349.x. Green open access

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Abstract

MERLIN observations are presented of OH 4765-MHz and OH 1720-MHz masers in the massive star-forming region W3(OH). Two of the three intense spots of maser emission at 4765 MHz are spatially coincident with two similar spots at 1720 MHz in both left-hand circular (LHC) and right-hand circular (RHC) polarizations, to an accuracy of 15 mas. The spots also overlap in velocity when allowance is made for Zeeman splitting of the 1720-MHz line. We conclude that we have found two examples of masers in different rotational levels of OH which are co-propagating through the same column of gas and experiencing competitive gain effects. The third 4765-MHz maser spot was found to have no overlapping counterpart amongst the 1720-MHz masers.

Type: Article
Title: Co-propagation of maser emission at 1720 and 4765 MHz
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.2001.04349.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.2001.04349.x
Language: English
Additional information: © 2001 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
Keywords: Astronomy, emission, Maser Emission
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/140410
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