Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541514s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #415.14; Bulletin of the American Astronomical Society, Vol. 42, p.263
Astronomy and Astrophysics
Astronomy
Scientific paper
Magnetic fields play an important role in many physical phenomena. Yet there are only a few diagnostic probes of the magnetic field strength; for example, the Zeeman Effect has been extensively used but it is a difficult measurement. A new technique was proposed to measure the magnetic field strength in photo-dissociation regions (PDRs) that assumes the non-thermal line widths of carbon recombination lines from PDRs near ultra-compact HII regions are dominated by hydromagnetic waves. They can be used to estimate the hydromagnetic wave speed and therefore the magnetic field strength.
The Robert C. Byrd Green Bank Telescope (GBT) was used to test this new technique by observing carbon recombination lines at 5 GHz toward five ultra-compact HII regions: W3, W49, NGC6334A, NGC6334D, and Orion B. High sensitivity line profiles of carbon and sulfur were obtained and the non-thermal line widths were calculated. These data will be used to constrain models of the photo-dissociation region and to calculate the magnetic field strength, which will then be compared with Zeeman measurements from the literature.
Anish Roshi D.
Balser Dana S.
Bania Thomas M.
Rood Robert T.
Shitanishi Jennifer
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