Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20719503r&link_type=abstract
American Astronomical Society Meeting 207, #195.03; Bulletin of the American Astronomical Society, Vol. 37, p.1493
Astronomy and Astrophysics
Astronomy
2
Scientific paper
A detailed inspection of the polarization properties of the 100-m Green Bank Telescope (GBT) by the authors has revealed that the GBT should be unparalleled among large single-dish radio telescopes for making Zeeman-splitting measurements of spectral lines in emission. The off-axis design and unblocked aperture of the GBT provide a characterizable polarized beam structure with negligible response outside of the main beam. This talk will focus on recent GBT detections of Zeeman splitting of the 21-cm line in emission. First, detection of the 8 μ G line-of-sight magnetic field towards the North Celestial Pole will be discussed. Then results will be shown from two slices across the major axis of a filamentary molecular cloud in Orion. The measured line-of-sight fields in combination with plane-of-sky polarization measurements suggest that this may be the first evidence of a helical magnetic field. Support for this work was provided by the NSF through award GSSP 05-0004 from the NRAO.
Heiles Carl
Robishaw Timothy
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