Abstract

In these proceedings, we discuss the parallax and proper motion measurements towards 43 high-mass star forming regions in the Scutum spiral arm. These observations were conducted with the Very Long Baseline Array within the framework of the Bar and Spiral Structure Legacy (BeSSeL) survey. The pitch angle of the spiral arm was found to be 18.6$^{\circ}$ $\pm$ 2.9$^{\circ}$, which is much larger than in other spiral arms. In this arm, many sources have large peculiar motions, especially a group between $l$=29$^{\circ}$ and 32$^{\circ}$ which shows ordered motion > 25 km s$^{-1}$ towards the Galactic Center.

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