报告题目：Deep 6cm Imaging of the Sgr A Complex with the VLA — Surprising Morphologies Revealed

　　报告人：Prof. Mark Morris (UCLA)

　　报告摘要：The greatly increased sensitivity of the upgraded Jansky Very Large Array has made it possible to produce much deeper radio continuum maps than were ever possible before, although at the cost of working with enormous data sets. We [Jun-Hui Zhao, W. Miller Goss, and myself] have produced new images of the Sgr A complex at the Galactic center that have a dynamic range of about 100,000 from the brightest object in the field — our Galaxy’s supermassive black hole, Sgr A* — to the faint artifacts that are unavoidable with aperture synthesis observations. The maps show a marvelous variety of objects, including numerous new nonthermal radio filaments appearing either as isolated features or as bundles, the supernova remnant Sgr A East and the runaway pulsar wind nebula that we have argued was produced by the core-collapse event that produced Sgr A East. In addition, unexplained features that have hard X-ray counterparts are present in the radio map made at 6-cm wavelength. I will discuss several of these features and their implications for the magnetic field at the Galactic center, for impulsive energy releases from objects in the central parsec, and for powerful dynamical interactions taking place at the present time.

　　报告时间：2016年10月27日星期四14:00

　　报告地点：紫台517会议室

欢迎大家积极参加！

　　                                                 紫金山天文台学术委员会