Abstract
We present the results of VLBI observations of three H$_2$O maser sources in massive star-forming regions: IRAS 06058$+$2138, IRAS 19213$+$1723, and AFGL 2789. We determined the annual parallaxes and proper motions for these sources by a phase-referencing method. The estimated distances to IRAS 06058$+$2138 and AFGL 2789 are 1.76$\pm$0.11 kpc and 3.07$\pm$0.30 kpc, which are located in the Perseus spiral arm. The distance to IRAS 19213$+$1723 is 3.98$\pm$0.57 kpc, placing it in the Carina–Sagittarius arm. With estimated 3-dimensional velocity components, we have shown that the galactic rotation curve is flat in the range of 6.4 kpc $\le R \le$ 13 kpc as combining with S 269, which was observed with VERA. We have also found that the overall rotation curve of the Galaxy do not depend on $\Theta_0$. The maser sources also show deviations from flat rotation curves by a few kilometers per second. We discuss possible reasons for these peculiar motions.
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