SIMBAD references

2001MNRAS.324..643G - Mon. Not. R. Astron. Soc., 324, 643-647 (2001/July-1)

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

GRAY M.D., COHEN R.J., RICHARDS A.M.S., YATES J.A. and FIELD D.

Abstract (from CDS):

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(ref???[q1]) (LHC) and right-hand circular(ref???[q1]) (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.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): masers - radiative transfer - circumstellar matter - ISM: individual: W3(OH) - radio lines: stars

Nomenclature: Table 1: [GCR2001] Spot A (Nos A-D)

Simbad objects: 5

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