Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.5915s&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #59.15; Bulletin of the American Astronomical Society, Vol. 33, p.874
Astronomy and Astrophysics
Astronomy
Scientific paper
We present VLA observations of the Zeeman effect in water masers. The Zeeman effect in radio frequency spectral lines remains the most direct method for measuring magnetic field strengths in the ISM. Water masers are an unique tracer of the Zeeman effect in high density regions. Our observations, which constitute the first comprehensive interferometric study of the Zeeman effect in water masers, reveal significant fields ranging from 13 to 49 mG in several star forming regions. For some regions, the detected fields also provide a 2/3-point map of the magnetic field, indicating the nature of field variations on arcsecond scales. The observed values of the magnetic field indicate that the magnetic field-gas density relationship inferred from H I and OH Zeeman effect observations at lower densities may carry over to the higher density regime.
Crutcher Richard M.
Roberts Daniel A.
Sarma Anuj Pratim
Troland Thomas H.
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