演講資訊

摘要：

We employed recent observations of tens of thousands of intermediate-old stars with the APOGEE and RAVE large-scale spectroscopic surveys to detect the spiral arm segments in the Milky Way Galaxy. The distances of the centers (the densest parts), pitch angles of the previously known 3 kpc, Norma, Scutum, Sagittarius, Orion, Perseus, and Outer spiral arms and their widths are estimated. For the first time, two new Outer+1 and Outer+2 arm segments in the outer Galaxy were found. Thus, the stellar spiral structure extends well outside the Outer arm up to the Galactocentric distance of 16-17 kpc.