Paper:	Large-scale Gas Dynamics in the Milky Way
Volume:	317, Milky Way Surveys: The Structure and Evolution of Our Galaxy
Page:	303
Authors:	Englmaier, P.; Gerhard, O.; Bissantz, N.
Abstract:	We present new gas flow models for the Milky Way inside the solar circle. Using a mass model derived from the COBE/DIRBE maps and clump giant star counts, and using a parametric model for the spiral arm pattern in the disk, we calculate the gas flow and compare with 12CO observations. We find that models with 4 spiral arms fit the observations better then 2-armed models. We also find that models with separate pattern speeds for the bar and spiral arms can explain the gas flow in the bar corotation region better than single-pattern speed models.

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