SIMBAD references

1998ApJ...509..270K - Astrophys. J., 509, 270-282 (1998/December-2)

Expansion of W3(OH).


Abstract (from CDS):

A direct measurement of the expansion of W3(OH) is made by comparing Very Large Array images taken ∼10 yr apart. The expansion is anisotropic with a typical speed of 3-5 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 slowly expanding shell-like H II region, with either a fast rarefied flow or another less massive, diffuse, ionized region moving toward the observer. There is also a rapidly evolving source near the projected center of emission, perhaps related to the central star.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Individual Alphanumeric: W3(OH) - ISM: Kinematics and Dynamics - Techniques: Interferometric

Simbad objects: 5

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