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2005MNRAS.360.1162E - Mon. Not. R. Astron. Soc., 360, 1162-1170 (2005/July-1)

The association of OH and methanol masers in W3(OH).


Abstract (from CDS):

We present single-baseline Multi-Element Radio-Linked Interferometer Network (MERLIN) measurements of excited OH 6.0-GHz masers and methanol 6.7-GHz masers for the source W3(OH). These allow us to compare the positions of individual maser spots of these two species to ∼15 mas accuracy for the first time, and to compare these with previously published positions of ground-state OH masers near 1.7 GHz and excited-state OH masers near 4.7 GHz. There is a strong association between OH 6035-MHz and 1665-MHz masers. OH and methanol have very similar distributions, but associations of individual masers are relatively rare: most methanol 6.7-GHz masers are within 100 mas of OH 6.0-GHz masers, but only four methanol masers are within 15 mas of an OH 6.0-GHz maser. There are no correspondences of either species with excited OH 4.7-GHz masers. Zeeman splitting of the 6.0-GHz OH lines indicates an ordered magnetic field ranging from 3.2 to 14.4 mG. The magnetic fields estimated from co-propagating masers such as 6035 and 1665 MHz are generally in good agreement with each other.

Abstract Copyright: 2005 RAS

Journal keyword(s): magnetic fields - masers - polarization - stars: formation - ISM: individual: W3(OH) - radio lines: ISM

Nomenclature: Table 1: [ECG2005] OH NN (Nos 1-42). Table 2: [ECG2005] CH3OH NN (Nos 1-15).

Simbad objects: 4

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