All Figures

$\begin{figure} \par\includegraphics[angle=-90,width=15cm,clip]{0189fig1.ps} \end{figure}$ Figure 1: Continuum emission maps taken with the OVRO millimeter array toward IRAS 20050+2720 MMS1 with a) natural weighting ( left) and b) uniform weighting ( right). The solid contours start at $+2\sigma$ level with $+2\sigma$ interval and the dashed contours are $-2\sigma$ intervals started at $-2\sigma$ level. The image noise levels are 0.78 and 1.5 mJy beam^-1 for the panels a) and b), respectively. The white dot and the eastern cross indicate the positions of the low-velocity and EHV H₂O maser emission (see Sect. 4.2.2). The sizes of the synthesized beams are presented in the bottom right corners.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.6cm,clip]{0189fig2.eps} \end{figure}$ Figure 2: Total integrated intensity map of the H₂O masers in the MAIN Field of IRAS 20050+2720 MMS1 obtained at the 3rd epoch (1999 June 5) of the VLBA observations. Contour levels are 10, 20, 30, 50, 100, 200, 400, 800, 1600, 3200, 6400, 12 800 and 25 600 times the image noise level of 12.3 mJy beam^-1 km s^-1. The inserted panel in the top right corner shows the H₂O maser spectrum obtained by integrating the emission over the presented region. The vertical arrow shows the ambient cloud velocity ( $V_{\rm sys}$ ) of $V_{\rm LSR}=6.0$ km s^-1 estimated from CS J=3-2 line observations (BFT95). The size of the synthesized beam is presented in the bottom right corner.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=17cm,clip]{0189fig3.eps} \end{figure}$ Figure 3: Total integrated intensity maps (contours) overlaid with isovelocity maps (images) for the MAIN Field of the H₂O masers inIRAS 20050+2720. The contour levels are the same as those in Fig. 2. The velocity range shown here is from $V_{\rm LSR}=-1.5$ to 8.5 km s^-1. The white dots present peak positions of the maser spots. Boxes with labels indicate identified maser features.
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In the text

$\begin{figure} \par\includegraphics[width=5.8cm,clip]{0189f4a.eps}\hspace*{4mm} ... ...cm}\includegraphics[width=5.8cm,clip]{0189f4g.eps}\hspace*{3.5cm}} \end{figure}$ Figure 4: H₂O maser spectra toward Features 2, 4, 5, 9, 13, SW and EHV in IRAS 20050+2720 MMS1. The ambient cloud velocity is $V_{\rm LSR}=6.0$ km s^-1 (BFT95). In each feature, the spectra in the left-hand panels are magnified in the right-hand panels.
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In the text

$\begin{figure} \par\includegraphics[width=13cm,clip]{0189fig5.eps} \end{figure}$ Figure 5: Overlay of the peak positions of the low-velocity H₂O maser spots in the MAIN-Field of IRAS 20050+2720 MMS1. The colors present the observing epochs and the dashed-boxes indicate the maser features identified in Sect. 4.3. The dashed-boxes are the same as the solid boxes in Fig. 3.
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In the text

$\begin{figure} \par\mbox{\hspace*{8mm}\includegraphics[width=4cm,clip]{0189f6a.e... ...ip]{0189f6f.eps} \includegraphics[width=5.6cm,clip]{0189f6g.eps} } \end{figure}$ Figure 6: Overlay of the peak positions of the maser spots in Features 2, 4, 5, 9, 13, SW and EHV where the maser emission was detected continuously more than 3 epochs. The colors indicate the observing epochs as in Fig. 5. Each color-coded plus mark indicates the intensity-weighted mean position of the features at each observing epoch. The black cross in Feature 5 indicates the adopted positional reference spot at $V_{\rm LSR}= 1.6$ km s^-1.
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In the text

$\begin{figure} \par\mbox{\includegraphics[angle=-90,width=10.1cm,clip]{0189f7a.eps} \includegraphics[angle=-90,width=4.3cm,clip]{0189f7b.eps} } \end{figure}$ Figure 7: Plots of intensity-weighted mean positions of the 7 features vs. time. Error bars include the positional uncertainties in Table 2 and the size of the reference spot at 1.6 km s^-1 (Sect. 4.5). The straight lines are the best-fit to the data. The origin of the time axis is 1999 April 1.
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In the text

$\begin{figure} \par\includegraphics[width=6.8cm,clip]{0189fig8.eps} \end{figure}$ Figure 8: Sketch of the biconical jet model. The z and x axes correspond to the line of sight and the jet axis projected on the plane of the sky, respectively. An observer lies at $z=-\infty$ , and the x-y plane corresponds to the plane of the sky.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.1cm,clip]{0189fig9.eps} \end{figure}$ Figure 9: Guide map showing the 3 jet axes that have been taken as cutting lines in the position-velocity diagrams (see text; Fig. 10). To avoid confusion, we present only an outline of each single lobe of the jet. The position angles of the 3 jet axes in the upper panel are $61^{\circ }$ for the axis with the labels of A1 and A2, $101^{\circ }$ for B1 and B2, and $28^{\circ }$ for C1 and C2.
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In the text

$\begin{figure} \par\includegraphics[width=8.1cm,clip]{0189f10.eps} \end{figure}$ Figure 10: Comparison of the radial velocities from the biconical jet model with the observed LSR-velocities in the position-velocity (PV) diagram along the A1-A2 axis. Here we plotted all of the maser spots detected in the 4 epoch observations. The vertical and horizontal dashed lines, respectively, represent the positions of the reference 1.6 km s^-1 spot. Expected blue- and redshifted radial velocity regions from the model are hatched with blue and red, respectively (see text).
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=17cm,clip]{0189fig3.eps} \end{figure}$	Figure 3: Total integrated intensity maps (contours) overlaid with isovelocity maps (images) for the MAIN Field of the H₂O masers inIRAS 20050+2720. The contour levels are the same as those in Fig. 2. The velocity range shown here is from $V_{\rm LSR}=-1.5$ to 8.5 km s^-1. The white dots present peak positions of the maser spots. Boxes with labels indicate identified maser features.
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$\begin{figure} \par\includegraphics[width=5.8cm,clip]{0189f4a.eps}\hspace{4mm} ... ...cm}\includegraphics[width=5.8cm,clip]{0189f4g.eps}\hspace{3.5cm}} \end{figure}$	Figure 4: H₂O maser spectra toward Features 2, 4, 5, 9, 13, SW and EHV in IRAS 20050+2720 MMS1. The ambient cloud velocity is $V_{\rm LSR}=6.0$ km s^-1 (BFT95). In each feature, the spectra in the left-hand panels are magnified in the right-hand panels.
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$\begin{figure} \par\includegraphics[width=13cm,clip]{0189fig5.eps} \end{figure}$	Figure 5: Overlay of the peak positions of the low-velocity H₂O maser spots in the MAIN-Field of IRAS 20050+2720 MMS1. The colors present the observing epochs and the dashed-boxes indicate the maser features identified in Sect. 4.3. The dashed-boxes are the same as the solid boxes in Fig. 3.
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$\begin{figure} \par\mbox{\includegraphics[angle=-90,width=10.1cm,clip]{0189f7a.eps} \includegraphics[angle=-90,width=4.3cm,clip]{0189f7b.eps} } \end{figure}$	Figure 7: Plots of intensity-weighted mean positions of the 7 features vs. time. Error bars include the positional uncertainties in Table 2 and the size of the reference spot at 1.6 km s^-1 (Sect. 4.5). The straight lines are the best-fit to the data. The origin of the time axis is 1999 April 1.
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$\begin{figure} \par\includegraphics[width=6.8cm,clip]{0189fig8.eps} \end{figure}$	Figure 8: Sketch of the biconical jet model. The z and x axes correspond to the line of sight and the jet axis projected on the plane of the sky, respectively. An observer lies at $z=-\infty$ , and the x-y plane corresponds to the plane of the sky.
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$\begin{figure} \par\includegraphics[angle=-90,width=7.1cm,clip]{0189fig9.eps} \end{figure}$	Figure 9: Guide map showing the 3 jet axes that have been taken as cutting lines in the position-velocity diagrams (see text; Fig. 10). To avoid confusion, we present only an outline of each single lobe of the jet. The position angles of the 3 jet axes in the upper panel are $61^{\circ }$ for the axis with the labels of A1 and A2, $101^{\circ }$ for B1 and B2, and $28^{\circ }$ for C1 and C2.
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