HI and OH Zeeman Observations Toward Orion's Veil

Details HI and OH Zeeman Observations Toward Orion's Veil HI and OH Zeeman Observations Toward Orion's Veil

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..343..183b&link_type=abstract

Astronomical Polarimetry: Current Status and Future Directions ASP Conference Series, Vol. 343, Proceedings of the Conference he

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We present new Very Large Array H I and OH Zeeman observations toward Orion A with 25 arcsec and 45 arcsec resolution, respectively. Significant Zeeman line of sight magnetic fields are detected toward much of the Orion A continuum in two distinct velocity components. The measured field strengths range from ˜-50 μG near the Trapezium region to ˜-300 μG toward the `Dark Bay'. Line of sight field strengths of ˜-250 μG are also measured from OH absorption lines toward the `Dark Bay' region. From optical extinction and UV absorption lines it is clear that the H I and OH absorption arises from a ``veil'' of primarily neutral gas that covers much of the Orion A source. Photoionization models suggest that the Veil is located 1-3 pc in front of the Trapezium and has an average density of 10^{3.1} cm^{-3}. At this density the magnetic field energy dominates the energy of nonthermal motions or gravity. Therefore, Orion's Veil is the first interstellar environment where magnetic dominance appears to exist.

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