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.

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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.

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