SIMBAD references

1994A&A...286L..51G - Astronomy and Astrophysics, volume 286, L51-54 (1994/6-3)

The magnetic field in the dense gas bordering W3(OH).

GUESTEN R., FIEBIG D. and UCHIDA K.I.

Abstract (from CDS):

We report the detection of a 3.1±0.4mG magnetic field in the dense crescent of gas bordering the W3(OH) compact HII region. The Zeeman splitting in the highly excited 2{PI}3/2 J=7/2 F=3+-3 transition of OH was observed, in absorption against the radio continuum, with the MPIfR 100-m telescope. The derived field strength is, by far, the strongest ever reported from thermally excited, i.e., non-masing gas; it compares with the average field derived from the cluster of OH maser spots, thought to arise from within the same dense layer of gas. A quantitative anlysis reveals that magnetic pressure dominates the clump energetics by nearly an order of magnitude over other processes. A possible scenario is discussed in terms of a bow-shock model, in which the magnetic field is compressed in the cooled post-shock layer preceeding the compact HII region.

Abstract Copyright:

Journal keyword(s): interstellar medium: clouds: individual: W 3 (OH) - radio lines: molecules (OH) - masers - magnetic field

Simbad objects: 1

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