报告题目：Dense molecular gas in local ULIRGs

　　报告人：Dr. Thomas Greve (UCL)

　　摘要：The population of nearby of gas-rich and highly dust-obscured Ultra Luminous Infrared Galaxies (ULIRGs) provides us with a unique opportunity to study the physical processes governing star formation in kinematically violent and radiation-harsh environments.

　　As part of the Herschel Comprehensive (U)LIRG Emission Survey (HerCULES) we have obtained the full CO rotational ladder for a sample of 26 (U)LIRGs. In addition, we have compiled our ground-based spectral line observations of this sample, as well as all available data from the literature, of crucial dense gas tracers such as CS, HCN, and HCO+ (and in some cases their isotopologues).

　　I will discuss some of the first results coming out of this unique data-set, from simple star formation relations to multi-phased Large Velocity Gradient (LVG) radiative transfer models that allow us to disentangle different molecular gas phases and possibly different molecular gas heating mechanisms in these galaxies.

　　报告时间：2015年9月18日（星期五）下午3:00

　　报告地点：紫台办公大楼 619 会议室

　　联系人：马红君（83332210）

欢迎大家积极参加！

　　                                             紫金山天文台学术委员会