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OH (1720 MHz) masers: signposts of SNR/molecular cloud interactions

Published online by Cambridge University Press:  01 March 2007

Crystal L. Brogan
Crystal L. Brogan*
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Rd, Charlottesville, VA, 22903, USA email:cbrogan@nrao.edu
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Abstract

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Over the last decade it has been demonstrated that supernova remnant (SNR) OH (1720 MHz) masers are unique tracers of SNR/molecular cloud interactions. Here I briefly review the current state of our observational understanding of these masers including results from recent MERLIN and VLBA full polarization studies of the masers in W28, W44, and W51C. Some of our findings include that (1) in accordance with theory, the linear polarization position angles are either parallel or perpendicular to the plane-of-sky magnetic field determined through other observations; (2) the maser spot sizes are fairly large (~ 1014 cm) and exhibit a core/halo morphology; and (3) while the magnetic field strengths do increase slightly with higher resolution, this effect can be completely explained by spectral/spatial blending.

Keywords

Masers(ISM:) supernova remnants
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 299 - 306
Copyright
Copyright © International Astronomical Union 2008

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