All Figures

$\begin{figure} \par\includegraphics[width=15.4cm,clip]{2882CMJN.f5.eps} \end{figure}$ Figure 5: 1667-MHz OH absorption, highligting in colour the OH-Streamer near Sgr $\rm {A}^{*}$ and the absorption towards SgrAEast. The range in colour is in mJy/beam. The velocities are indicated in the upper right corner. The contour level of 15 mJy/beam indicates SgrAEast and the three compact H II-regions to its east, the contour level 93 mJy/beam indicates SgrAWest, and the contour level 500 mJy/beam indicates Sgr $\rm {A}^{*}$ .
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In the text

$\begin{figure} \par\includegraphics[width=15.4cm,clip]{2882CMJN.f6.eps} \end{figure}$ Figure 6: 1667-MHz OH line-to-continuum distribution ( $-T_{\rm L}/T_{\rm C}$ ), highligting in colour the OH-Streamer near Sgr $\rm {A}^{*}$ and the absorption towards SgrAEast. The range of the colour scale is from 0.0 to 2.0. The velocities are indicated in the upper right corner. The position of Sgr $\rm {A}^{*}$ is indicated by a tiny yellow contour.
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In the text

$\begin{figure} \par\includegraphics[width=14cm,clip]{2882.f7} \end{figure}$ Figure 7: 1667-MHz OH line-to-continuum distribution ( $-T_{\rm L}/T_{\rm C}$ ) for the High Negative Velocity Gas (HNVG) at $v_{\rm LSR}=-170.1$ km s^-1. The range of the gray scale is from 0 to 0.500. The contour level of 15 mJy/beam indicates the western shell of SgrAEast, the contour level 93 mJy/beam indicates SgrAWest, and the contour level 500 mJy/beam indicates Sgr $\rm {A}^{*}$ .
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f8} \end{figure}$ Figure 8: 18-cm OH main line summary; Maxmaps and Minmaps at 1665 MHz and 1667 MHz. Continuum contours and a cross at the position of Sgr $\rm {A}^{*}$ are placed to guide the eye. The gray scale showing the relative noise of the maps is set to match that of the satellite lines (see text).
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f9} \end{figure}$ Figure 9: 18-cm OH satellite line summary; Maxmaps and Minmaps at 1612 MHz and 1720 MHz. Continuum contours and a cross at the position of Sgr $\rm {A}^{*}$ are placed to guide the eye. The gray scale showing the relative noise of the maps is set to match that of the main lines (see text).
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f1a} \end{figure}$ Figure 1: 1665-MHz OH absorption, +215 km s^-1 $\protect\la v_{\rm LSR} \protect\la +120$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f1b}\end{figure}$ Figure 1: continued. +110 km s^-1 $\protect\la v_{\rm LSR} \protect\la +15$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f1c}\end{figure}$ Figure 1: continued. +5 km s^-1 $\protect\la v_{\rm LSR} \protect\la-90$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f1d}\end{figure}$ Figure 1: continued. -100 km s^-1 $\protect\la v_{\rm LSR} \protect\la-195$ km s^-1.
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f2a} \end{figure}$ Figure 2: 1667-MHz OH absorption, +145 km s^-1 $\protect\la v_{\rm LSR} \protect\la +50$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f2b}\end{figure}$ Figure 2: continued. +40 km s^-1 $\protect\la v_{\rm LSR} \protect\la-55$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f2c}\end{figure}$ Figure 2: continued. -65 km s^-1 $\protect\la v_{\rm LSR} \protect\la -160$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f2d}\end{figure}$ Figure 2: continued. -170 km s^-1 $\protect\la v_{\rm LSR} \protect\la-265$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3a} \end{figure}$ Figure 3: 1612-MHz OH absorption, +215km s^-1 $\protect\la v_{\rm LSR} \protect\la +115$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3b}\end{figure}$ Figure 3: continued. +105 km s^-1 $\protect\la v_{\rm LSR} \protect\la +5$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3c}\end{figure}$ Figure 3: continued. 0 km s^-1 $\protect\la v_{\rm LSR} \protect\la-100$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3d}\end{figure}$ Figure 3: continued. -110 km s^-1 $\protect\la v_{\rm LSR} \protect\la-210$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4a} \end{figure}$ Figure 4: 1720-MHz OH absorption, +200 km s^-1 $\protect\la v_{\rm LSR} \protect\la +105$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4b}\end{figure}$ Figure 4: continued. +100 km s^-1 $\protect\la v_{\rm LSR} \protect\la +5$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4c}\end{figure}$ Figure 4: .continued. -5 km s^-1 $\protect\la v_{\rm LSR} \protect\la-95$ km s^-1.
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In the text

$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4d}\end{figure}$ Figure 4: .continued. -105 km s^-1 $\protect\la v_{\rm LSR} \protect\la-200$ km s^-1.
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In the text

$\begin{figure} \par\includegraphics[width=15.4cm,clip]{2882CMJN.f6.eps} \end{figure}$	Figure 6: 1667-MHz OH line-to-continuum distribution ( $-T_{\rm L}/T_{\rm C}$ ), highligting in colour the OH-Streamer near Sgr $\rm {A}^{}$ and the absorption towards SgrAEast. The range of the colour scale is from 0.0 to 2.0. The velocities are indicated in the upper right corner. The position of Sgr $\rm {A}^{}$ is indicated by a tiny yellow contour.
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$\begin{figure} \par\includegraphics[width=14cm,clip]{2882.f7} \end{figure}$	Figure 7: 1667-MHz OH line-to-continuum distribution ( $-T_{\rm L}/T_{\rm C}$ ) for the High Negative Velocity Gas (HNVG) at $v_{\rm LSR}=-170.1$ km s^-1. The range of the gray scale is from 0 to 0.500. The contour level of 15 mJy/beam indicates the western shell of SgrAEast, the contour level 93 mJy/beam indicates SgrAWest, and the contour level 500 mJy/beam indicates Sgr $\rm {A}^{*}$ .
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$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f8} \end{figure}$	Figure 8: 18-cm OH main line summary; Maxmaps and Minmaps at 1665 MHz and 1667 MHz. Continuum contours and a cross at the position of Sgr $\rm {A}^{*}$ are placed to guide the eye. The gray scale showing the relative noise of the maps is set to match that of the satellite lines (see text).
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$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f9} \end{figure}$	Figure 9: 18-cm OH satellite line summary; Maxmaps and Minmaps at 1612 MHz and 1720 MHz. Continuum contours and a cross at the position of Sgr $\rm {A}^{*}$ are placed to guide the eye. The gray scale showing the relative noise of the maps is set to match that of the main lines (see text).
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$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f1a} \end{figure}$	Figure 1: 1665-MHz OH absorption, +215 km s^-1 $\protect\la v_{\rm LSR} \protect\la +120$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f1b}\end{figure}$	Figure 1: continued. +110 km s^-1 $\protect\la v_{\rm LSR} \protect\la +15$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f1c}\end{figure}$	Figure 1: continued. +5 km s^-1 $\protect\la v_{\rm LSR} \protect\la-90$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f1d}\end{figure}$	Figure 1: continued. -100 km s^-1 $\protect\la v_{\rm LSR} \protect\la-195$ km s^-1.
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$\begin{figure} \par\includegraphics[width=17cm,clip]{2882.f2a} \end{figure}$	Figure 2: 1667-MHz OH absorption, +145 km s^-1 $\protect\la v_{\rm LSR} \protect\la +50$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f2b}\end{figure}$	Figure 2: continued. +40 km s^-1 $\protect\la v_{\rm LSR} \protect\la-55$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f2c}\end{figure}$	Figure 2: continued. -65 km s^-1 $\protect\la v_{\rm LSR} \protect\la -160$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f2d}\end{figure}$	Figure 2: continued. -170 km s^-1 $\protect\la v_{\rm LSR} \protect\la-265$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3a} \end{figure}$	Figure 3: 1612-MHz OH absorption, +215km s^-1 $\protect\la v_{\rm LSR} \protect\la +115$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3b}\end{figure}$	Figure 3: continued. +105 km s^-1 $\protect\la v_{\rm LSR} \protect\la +5$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3c}\end{figure}$	Figure 3: continued. 0 km s^-1 $\protect\la v_{\rm LSR} \protect\la-100$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f3d}\end{figure}$	Figure 3: continued. -110 km s^-1 $\protect\la v_{\rm LSR} \protect\la-210$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4a} \end{figure}$	Figure 4: 1720-MHz OH absorption, +200 km s^-1 $\protect\la v_{\rm LSR} \protect\la +105$ km s^-1. Contours are at 20, 50, 100, 200, and 500 mJy/beam in absorption. An arbitrary gray scale outlines the 18-cm continuum and a cross marks the position of Sgr $\rm {A}^{*}$ .
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4b}\end{figure}$	Figure 4: continued. +100 km s^-1 $\protect\la v_{\rm LSR} \protect\la +5$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4c}\end{figure}$	Figure 4: .continued. -5 km s^-1 $\protect\la v_{\rm LSR} \protect\la-95$ km s^-1.
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$\begin{figure}\par\includegraphics[width=17cm,clip]{2882.f4d}\end{figure}$	Figure 4: .continued. -105 km s^-1 $\protect\la v_{\rm LSR} \protect\la-200$ km s^-1.
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