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Enhanced density and magnetic fields in interstellar OH masers

Vincent L. Fish·Mark J. Reid·Karl M. Menten·Thushara Pillai
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Abstract

Aims: We have observed the 6030 and 6035 MHz transitions of OH in high-mass star-forming regions to obtain magnetic field estimates in both maser emission and absorption. Methods: Observations were taken with the Effelsberg 100 m telescope. Results: Our observations are consistent with previous results, although we do detect a new 6030 MHz maser feature near -70 km/s in the vicinity of W3(OH). In absorption we obtain a possible estimate of -1.1 +/- 0.3 mG for the average line-of-sight component of the magnetic field in the absorbing OH gas in K3-50 and submilligauss upper limits for the line-of-sight field strength in DR 21 and W3. Conclusions: These results indicate that the magnetic field strength in the vicinity of OH masers is higher than that of the surrounding, non-masing material, which in turn suggests that the density of masing OH regions is higher than that of their surroundings.

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Vincent L. Fish, Mark J. Reid, Karl M. Menten, Thushara Pillai. 2006-08-04. Enhanced density and magnetic fields in interstellar OH masers. https://doi.org/10.1051/0004-6361%3A20065379

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