演講資訊

摘要：

It is well-known that our galaxy has a spiral structure (Oort et al. 1958; Bok 1959), but a detailed understanding of the Milky Way is still lacking, in particularly in the outer Galaxy. Our knowledge of the outer Galaxy to date is largely dependent on HI emission surveys. The 21 cm line observations outline a spiral structure out to at least 25 kpc, implying a minimum radius for the gas disk (Levine et al. 2006). The Milky Way Imaging Scroll Painting (MWISP) project is a high resolution (50arcsec) J=1-0 12CO, 13CO, and C18O survey of the northern Galactic Plane, performed with the Purple Mountain Observatory Delingha 13.7 m telescope. The survey started in 2011, and will cover Galactic longitudes from l = -10.25◦ to 250.25◦ and latitudes from b = -5.25◦ to 5.25◦ over a period of ∼10 years. The high-sensitivity data from MWISP survey will provide us an unique opportunity to systematically study the spiral structure and star-formation activity in the Milky Way. I will report on the research progress on the spiral structure of our Galaxy using MWISP data.