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Title:
The OH (1720 MHz) Supernova Remnant Masers in W44: MERLIN and VLBA Polarization Observations
Authors:
Hoffman, Ian M.; Goss, W. M.; Brogan, C. L.; Claussen, M. J.
Affiliation:
AA(National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801; and Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131; ), AB(National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801), AC(Institute for Astronomy, 640 North A`ohoku Place, Hilo, HI 96720), AD(National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801)
Publication:
The Astrophysical Journal, Volume 627, Issue 2, pp. 803-812. (ApJ Homepage)
Publication Date:
07/2005
Origin:
UCP
ApJ Keywords:
ISM: Individual: Alphanumeric: W44, Masers, Radio Lines: ISM, ISM: Supernova Remnants
DOI:
10.1086/430419
Bibliographic Code:
2005ApJ...627..803H

Abstract

Full-polarization MERLIN and VLBA observations of the 1720 MHz maser emission from the OH molecule in the supernova remnant W44 are presented. Zeeman splitting has been directly resolved between right- and left-circularly polarized spectra indicating magnetic field strengths of |B|~0.50 mG. The position angle of the linear polarization is in good agreement with the orientation of the shocked gas at the supernova remnant/molecular cloud interface. Based on MERLIN data having a resolution of 200 mas and VLBA data with a resolution of 15 mas, the masers are measured to have deconvolved angular sizes of 50-350 mas (150-1000 AU) with compact cores 20 mas (60 AU) in size, consistent with theoretical expectation and previous observations.
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