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Measurement of Magnetic-Field Strengths in Molecular Clouds: Detection of OH Line Zeeman Splitting

Published online by Cambridge University Press:  04 August 2017

I. Kazès ,
R. M. Crutcher  and
T. H. Troland
I. Kazès
Affiliation:
Département de Radioastronomie, Observatoire de Paris-Meudon F-92195 Meudon, France
R. M. Crutcher
Affiliation:
Département de Radioastronomie, Observatoire de Paris-Meudon F-92195 Meudon, France Department of Astronomy, University of Illinois, Urbana, Il 61801, USA
T. H. Troland
Affiliation:
Département de Radioastronomie, Observatoire de Paris-Meudon F-92195 Meudon, France Department of Astronomy, University of Illinois, Urbana, Il 61801, USA

Extract

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We report here the first results of an extended program to measure magnetic-field strengths in interstellar molecular clouds. The very large radio telescope located near Nancay, France, has been used to measure the Stokes-parameter I and V spectra of the 1665 and 1667 MHz lines of OH in emission and in absorption from extended (non-masing) molecular clouds. Signals in the V spectra are produced by Zeeman splitting of the spectral lines; we derive magnetic-field strengths or limits from these data.

Type
I. Star Forming Processes in the Solar Neighborhood
Information
Symposium - International Astronomical Union , Volume 115: Star Forming Regions , 1987 , pp. 55 - 57
Copyright
Copyright © Reidel 1987