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【云臺學術報告】2019年11月25日(星期一)下午14:30--15:30 科研樓1號樓427會議室
2019-11-20  |  作者:  |  【  】 【打印】 【關閉

【學術報告】

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報告題目:   The Complexity of Orion: An ALMA view

報告人:    Laurent PAGANI

報告人單位:   法國巴黎天文臺

報告時間:  2019年11月25日(星期一)下午14:30--15:30      

報告地點:   科研樓1號樓427會議室

報告語言:     英文

報告摘要: 

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Orion KL is the closest (400 pc) of all the massive star forming regions and allows therefore detailed studies. Despite its closeness, its complexity still calls for interferometric 

observations in order to separate the different subregions emitting at different velocities, which are otherwise mixed in an inextricable combination of different species at similar 

apparent frequencies in single dish observations. Orion KL has another peculiarity : it has undergone an explosive event 500 years ago as revealed by H2 and CO maps, and also 

by the proper motion of several stellar objects, including BN, I, x and n.

While our ALMA observations were mostly aimed at detecting the rare isotopologue 16O18O to follow up on our Herschel detection of O2 towards this region (Goldsmith et al. 2011, 

Chen et al. 2014), we took the advantage of that deep search to observe 16 GHz of spectral band in the 1.3 mm window. We did not detect 16O18O but the quality of our data (a 5-fold 

improvement compared to the similar data taken during Science Verification 0) allowed us to identify a few species not detected yet in Orion, and study the kinematics of the region 

in detail. In particular, we report gGg’ ethylene glycol and acetic acid detections in a peculiar place, and we explain the line position and shape of each subregion, both in relation with

 the 500 year-old explosion. We show that based on this kinematics, we can make a rough 3D description of the region. 

The data quality is high enough to also study each species channel-wise. This reveals gas expansions never seen before which are traceable back to the explosion center. These expansions

 are comparable to time-of-flight experiments in the laboratory and allow therefore to establish the order of evolution between species, from those that are destroyed soon after their 

sublimation from the ices to those which survive until they get too diluted to be observed. This brings interesting clues to the chemistry of hot regions, and in particular of complex 

organic molecules (COMs) which call for laboratory and theoretical works to identify their genesis.

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11月20日 

 
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