Expansion of W3(oh)

Abstract

A direct measurement of the expansion of W3(OH) is made by comparing Very Large Array images taken D10 yr apart. The expansion is anisotropic with a typical speed of 3È5 km s~1, indicating a dynamical age of only 2300 yr. These observations are inconsistent with either the freely expanding shell model or a simple bow shock model. The most favored model is a… (More)

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