Co-propagation of maser emission at 1720 and 4765 MHz

Details Co-propagation of maser emission at 1720 and 4765 MHz Co-propagation of maser emission at 1720 and 4765 MHz

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.324..643g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 3, pp. 643-647.

Astronomy and Astrophysics

Astronomy

17

Masers, Radiative Transfer, Circumstellar Matter, Ism: Individual: W3(Oh), Radio Lines: Stars

Scientific paper

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 4765MHz are spatially coincident with two similar spots at 1720MHz in both left-hand circular (LHC) and right-hand circular (RHC) polarizations, to an accuracy of 15mas. 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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