Paper:	The Fine Structure of DDO 154
Volume:	240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA
Page:	290
Authors:	Hoffman, G. Lyle; van Gorkom, J. H.
Abstract:	VLA C-array HI synthesis mapping of the irregular galaxy DDO 154 reveals considerable structure in the HI disk even well outside the central part of the galaxy where stars have formed. A couple of prominent quasi-spherical cavities are examined in particular. They are typical of holes in other well-resolved irregular galaxies, consistent with supernova-driven evacuations, but lie entirely outside the stellar portion of the galaxy. The improved resolution of the central rotation curve does not significantly change the mass models that have been published by other authors previously. We are able to present a velocity dispersion map, which shows relatively uniform dispersions of 7 or 8 km s-1 through the outer regions of the gas disk.

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