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Title:
Magnetic field structure of the star-forming region W3(OH) - VLBI spectral line results
Authors:
Garcia-Barreto, J. A.; Burke, B. F.; Reid, M. J.; Moran, J. M.; Haschick, A. D.; Schilizzi, R. T.
Affiliation:
AA(Universidad Nacional Autonoma de Mexico, Ensenada; MIT, Cambridge, MA), AB(MIT, Cambridge, MA), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AE(Haystack Observatory, Westford; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 15, 1988, p. 954-966. Research supported by the Smithsonian Astrophysical Observatory and CONACYT. (ApJ Homepage)
Publication Date:
03/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
HYDROXYL EMISSION, INTERSTELLAR MAGNETIC FIELDS, INTERSTELLAR MASERS, LINE SPECTRA, STAR FORMATION, VERY LONG BASE INTERFEROMETRY, ASTRONOMICAL SPECTROSCOPY, CIRCULAR POLARIZATION, MOLECULAR CLOUDS, POLARIZED ELECTROMAGNETIC RADIATION, ZEEMAN EFFECT
DOI:
10.1086/166154
Bibliographic Code:
1988ApJ...326..954G

Abstract

The authors have conducted a six-station, VLBI observation of the ground state 1665 MHz OH emission source in W3(OH) with full polarization information. They have been able (1) to produce spectral line VLBI synthesis maps in all Stokes parameters; (2) to identify several Zeeman pairs; (3) to determine the percent of linear, circular, and total polarization of the emission of each feature; and (4) to infer some information about the three-dimensional structure of the magnetic field. Eighty-one maser components stronger than 1.5 Jy were detected. Sixty-five exhibited pure circular polarization. These observations suggest that the OH cloud is permeated with a magentic field having an average strength of 6 mG.

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