All Figures

$\begin{figure} { \psfig{figure=ms9689f1.eps,height=14.5cm,angle=-90,clip=} }\end{figure}$ Figure 1: A map of the integrated H92 $\alpha$ emission at 2 $^{\prime \prime }$ resolution (Roberts & Goss 1993), and superposed position-velocity diagrams along the ridge lines of the major morphological features. The position-velocity diagrams represent: a) the "Bar'' and (at the extreme east) "Eastern Arm''; b) the Western Arm, which is the ionized inner edge of the molecular circumnuclear disk; c) the Northern Arm. This display covers only the range $-200 \le v \le +200$ km s^-1 and misses some gas near Sgr A $^{\ast }$ which is recovered in Fig. 2.
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In the text

$\begin{figure} { \psfig{figure=ms9689f2.eps,height=13.8cm,angle=-90} }\end{figure}$ Figure 2: H92 $\alpha$ emission (Roberts et al. 1996) integrated over 25 km s^-1-wide velocity intervals centered as indicated with contours at 0.02, 0.04, 0.06... Jy beam^-1 km s^-1 and (lower right) over all velocities with contours at 0.04, 0.08, 0.12... Jy beam^-1 km s^-1. The spatial resolution is 1 $^{\prime \prime }$ .
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In the text

$\begin{figure} { \psfig{figure=ms9689f3.eps,height=7cm,clip=} } \end{figure}$ Figure 3: From Sanders (1998), Fig. 7 panel c), the model velocity field for the Northern Arm and Bar. Used by permission.
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In the text

$\begin{figure} { \psfig{figure=ms9689f4.eps,height=7cm,angle=-90,clip=} }\end{figure}$ Figure 4: View of the model ring segment described in Sect. 4 of the text. The inner and outer radii are 0.3 and 0.8 pc. The model is inclined 76 $^\circ$ to the line of sight in position angle 25 $^\circ$ and extends $\pm$ 0.09 pc about its midplane. Gas in the model rotates about the normal to the disk, labelled "z'', flowing from east to west behind Sgr A $^{\ast }$ . The projection of the local normal to the galactic equator - the axis of normal galactic rotation - is labeled "b''.
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In the text

$\begin{figure} { \psfig{figure=ms9689f5.eps,height=7.5cm,clip=} }\end{figure}$ Figure 5: Simulated H92 $\alpha$ emission from a flat ring segment extending 0.35-0.75 pc from the galactic center in a 150 $^\circ$ arc, shown in contours projected against a grayscale representation of the emission from the Bar and Eastern Arm. Coordinates are relative to Sgr A $^{\ast }$ .
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In the text

$\begin{figure} { \psfig{figure=ms9689f6.eps,height=7.5cm,clip=} }\end{figure}$ Figure 6: Position-velocity diagrams for a series of nested, coplanar, thin rings of gas in circular motion, shown as white contours projected against H92 $\alpha$ emission traced along the Bar and Eastern Arm as in Fig. 1a. Right ascension is relative to Sgr A $^{\ast }$ . In each panel, the radial extent of the ring (in pc) is indicated at the upper left. All the rings lie in a single plane which is inclined 76 $^\circ$ to the line of sight and has its major axis at position angle 25 $^\circ$ measured counterclockwise from celestial north, as shown in Fig. 4.
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In the text

$\begin{figure} { \psfig{figure=ms9689f2.eps,height=13.8cm,angle=-90} }\end{figure}$	Figure 2: H92 $\alpha$ emission (Roberts et al. 1996) integrated over 25 km s^-1-wide velocity intervals centered as indicated with contours at 0.02, 0.04, 0.06... Jy beam^-1 km s^-1 and (lower right) over all velocities with contours at 0.04, 0.08, 0.12... Jy beam^-1 km s^-1. The spatial resolution is 1 $^{\prime \prime }$ .
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$\begin{figure} { \psfig{figure=ms9689f3.eps,height=7cm,clip=} } \end{figure}$	Figure 3: From Sanders (1998), Fig. 7 panel c), the model velocity field for the Northern Arm and Bar. Used by permission.
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$\begin{figure} { \psfig{figure=ms9689f5.eps,height=7.5cm,clip=} }\end{figure}$	Figure 5: Simulated H92 $\alpha$ emission from a flat ring segment extending 0.35-0.75 pc from the galactic center in a 150 $^\circ$ arc, shown in contours projected against a grayscale representation of the emission from the Bar and Eastern Arm. Coordinates are relative to Sgr A $^{\ast }$ .
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