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Robin Garrod - Cornell University

Thursday, May 28 – 11:30-12:15PM

 

“Pathways to chemical complexity in the ISM”

 

Organic molecules of increasing complexity are being detected in star-forming regions. While dust grain-surface chemical processes were long recognized as being a part of the story, the apparent failure of the traditional gas-phase formation mechanisms makes understanding grain-surface chemistry, and its interaction with the gas phase, a priority.

I will present coupled gas-grain chemical models1 of hot-core regions, and show how the changing physical conditions of the star-formation process can lead to chemical enrichment, and to the formation of highly complex organics.

The recent detections of ethyl formate and n-propyl cyanide2 in Sgr B2N also provide useful data for the models, and allow strong conclusions to be drawn regarding the origins of these and other complex molecules in such star-forming regions.

 

Related Reference(s):

1. R. T. Garrod, S. L. Widicus Weaver, and E. Herbst, “Complex Chemistry in Star-forming Regions: An Expanded Gas-Grain Warm-up Chemical Model," ApJ., 682, 283-302 (2008).

2. Belloche, Garrod, Mueller, Menten, Comito, and Schilke, A&A, In Press, Astro-ph: 0902.4694 (2009).