Moore and Spiegel 1968

Moore, D.W., and E.A. Spiegel, 1968: On the flow of gas from the galactic center. Astrophys. J., 154, 863-874, doi:10.1086/149808.

We consider a steady axisymmetric flow out of the galactic center, neglecting magnetic and turbulent stresses and the self-gravitation of the gas. The flow is in the disk and possesses angular momentum, but otherwise the problem is like solar-wind theory, and we assume that initial conditions are specified at the edge of the nuclear disk. The equations of motions are then quite simple, and their solution indicates that the flow must contain a nearly discontinuous transition from supersonic to subsonic conditions. We argue that this transition must be a compressible hydraulic jump, or bore, which generates intense turbulence and gives rise to H II on the downstream edge of the bore. The bore causes radial deceleration of the gas and hence density enhancement, and we suggest that this phenomenon is associated with the expanding arm.

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Moore, D.W., and Spiegel, E.A.: On the flow of gas from the galactic center, Astrophys. J., 154, 863-874, doi:10.1086/149808, 1968.

Moore, D.W., and E.A. Spiegel (1968), On the flow of gas from the galactic center, Astrophys. J., 154, 863-874, doi:10.1086/149808.

Moore, D.W., and E.A. Spiegel, 1968: On the flow of gas from the galactic center. Astrophys. J., 154, 863-874, doi:10.1086/149808.

Moore, D.W., & Spiegel, E.A. 1968, Astrophys. J., 154, 863, doi:10.1086/149808.

Moore DW, Spiegel EA. On the flow of gas from the galactic center, Astrophys J 1968;154:863-874. doi:10.1086/149808.

D.W. Moore, E.A. Spiegel, Astrophys. J. 154, 863-874, doi:10.1086/149808 (1968).