Magnetic Fields in Shocked Regions: Very Large Array Observations of H2O Masers

Details Magnetic Fields in Shocked Regions: Very Large Array Observations of H2O Masers Magnetic Fields in Shocked Regions: Very Large Array Observations of H2O Masers

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...580..928s&link_type=abstract

The Astrophysical Journal, Volume 580, Issue 2, pp. 928-937.

Astronomy and Astrophysics

Astronomy

24

Ism: Clouds, Ism: Magnetic Fields, Masers, Polarization, Radio Lines: Ism, Shock Waves

Scientific paper

We present VLA observations of the Zeeman effect in 22 GHz H2O masers in several high-mass star-forming regions. These masers are believed to arise from collisional pumping in postshock environments. Therefore, the Zeeman effect data provide the most direct measurements of magnetic field strengths in high-density (n>~108 cm-3) postshock gas, where the field energy determines other physical conditions. Our observations yield significant magnetic field detections in W3 IRS 5, W3(OH), W49 N, and OH 43.8-0.1. In these sources, we detect line-of-sight field strengths ranging from 13 to 49 mG. For some regions, the detected fields provide a 2-3 point sampling of the magnetic field, indicating the nature of field variations on arcsecond scales. These field strengths are consistent with a shock-driven maser model having relatively low speed (20 km s-1), C-type shocks. We examine the balance between magnetic field energy and turbulent kinetic energy in the masing regions. These energies appear close to equilibrium.

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