报告题目：CO Lines as H2 Mass Estimators, Energy Source and SF Mode Indicators

报 告 人：Padelis P. Papadopoulos, 德国马普射电天文所

摘　  要：I will present results from a large extragalactic CO, 13CO and HCN multi-J line survey of Luminous Infrared Galaxies conducted with the James Clerk Maxwell Telescope (JCMT) in Hawaii (USA), the IRAM 30-m telescope in Granada (Spain), and expanded in Space using the Herschel Space Observatory (HSO). Analysis of complete CO Spectral Line Energy Distributions J=1--0 up to J=13--12 and the rest of the molecular lines strongly points to two major paradigm shifts:

1) Photon-dominated Regions (PDRs) are not the main power source of high-J CO line emission in (U)LIRGs  (Ultra-luminous LIRGs with L_IR>10^{11} Lsol) nor they are the main repository of their molecular gas mass

2) The low-J CO lines are inappropriate to obtain the total molecular gas or to discern the star formation mode of LIRGs (merger versus disk). A serious implication is the underestimate of the H2 mass in LIRGs by up to factors of 5.

报告时间：2012年8月31日上午10：00

报告地点：紫台办公楼619会议室

联 系 人：马红君 83332210

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