演講資訊

Prof. Uri (Evgeny) Griv (Ben-Gurion University, Israel)

"The Spiral Structure of the Milky Way Galaxy: A New Picture"

時間/地點: 2017-11-10 14:00 [S4-1013]

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.

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