报告题目：Milky Way Structure -- Observation vs. Simulation
报告摘要：Understanding the Galactic structure is non-trivial, mostly because we are located in the disk plane. The boxy, parallelogram-shaped bulge in the Milky Way in Infrared imagery can be well explained with a tilted bar structure. A vertical X-shaped structure in the Galactic bulge was recently reported. We present evidence of a similar X-shaped structure in Shen et al. (2010) bar/boxy bulge model that simultaneously matches the stellar kinematics successfully. The X-shaped structure is found in the central region of our bar/boxy bulge model and is qualitatively consistent with the observed one in many aspects. End-to-end separations of the X-shaped structure in the radial and vertical directions are roughly 3 kpc and 1.8 kpc, respectively. It is mainly associated with orbits trapped around the vertically extended x1 family. The existence of the X-shaped structure suggests that the formation of the Milky Way bulge is shaped mainly by internal disk dynamical instabilities. In this talk, I will also describe our recent results on the kinematics of the X-shaped component (Qin et al. 2013 to be submitted) and the discovery of a cold high velocity stream to the Galactic bulge in the APOGEE commissioning results (Li & Shen 2013 to be submitted).
时 间：11月26日（周二）上午10：00
地 点：南京大学苏富特大厦一楼会议室
报告人简介：
2002 - 2006, Undergraduate student, Department of Astronomy, Peking University
2006 - 2011, PhD student, Adviser: Prof. Xue-Bing Wu & Prof. Luis Ho, Department of Astronomy, Peking University
2008 - 2010, Research assistant, Adviser: Prof. Luis Ho, Carnegie Observatory, USA
2011 - 2013, Postdoc, Collaborator: Prof. Juntai Shen, Shanghai Astronomical Observatory
2013 - present, Assistant researcher, Collaborator: Prof. Juntai Shen, Shanghai Astronomical Observatory
欢迎各位老师、同学参加！
南京大学天文与空间科学学院
