SIMBAD references

2002ApJ...580..928S - Astrophys. J., 580, 928-937 (2002/December-1)

Magnetic fields in shocked regions: very large array observations of H2O masers.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - ISM: Magnetic Fields - Masers - Polarization - Radio Lines: ISM - Shock Waves

CDS comments: Calibrator : 2320+506 = RORF 2320+506.

Simbad objects: 20

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