题  目：The Nearest LINER: A Multiwavelength Study of The Circumnuclear Environment In M31

报告人：李志远(Harvard-Smithonian Astrophysical Observatory)

http://www.universetoday.com/65180/andromedas-unstable-black-hole/

摘  要：The so-called nuclear spiral in M31, consisting of ionized and neutral dusty gas clouds of typically sub-parsec sizes, shows optical emission lines characteristic of LINERs. Yet the lack of UV radiation from either an active nucleus or massive young stars makes the ionizing source of this nearest LINER a longstanding puzzle. I will present preliminary results of a multiwavelength study of the nuclear spiral, based on new and archival HST, Spitzer and Chandra observations. I will discuss the relative importance of various ionization/excitation mechanisms, in particular heating by energetic particles that are plausibly supplied by the dormant super-massive black hole. This study advances our understanding of the physical regulation of galactic circumnuclear environments.

时  间：2011年12月15日（星期四）上午10:00

地  点：（北京西路2号）紫台大楼楼 327教室

学术报告咨询：83332162

欢迎大家积极参与！

　　　　　　　　　　　　　　　  紫金山天文台学术委员会学术交流工作委员会