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Tracing the origins of nitrogen bearing organics toward Orion KL with ALMA

Carroll, Brandon and Blake, Geoffrey (2018) Tracing the origins of nitrogen bearing organics toward Orion KL with ALMA. In: 256th American Chemical Society National Meeting & Exposition, 19-23 August 2018, Boston, MA.

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A comprehensive anal. of a broadband 1.2 THz wide spectral survey of the Orion Kleinmann-Low nebula (Orion-KL) has shown that nitrogen bearing complex orgs. trace systematically hotter gas than O-bearing orgs. toward this source. The origin of this O/N dichotomy remains a mystery. If complex mols. originate from grain surfaces, N-bearing species may be more difficult to remove from grain surfaces than O-bearing orgs. Theor. studies, however, have shown that hot (T=300 K) gas phase chem. can produce high abundances of N-bearing orgs. while suppressing the formation of Obearing complex mols. Measurement of gradients in isotopic fractionation at spatial scales commensurate with the forces driving this chem. can distinguish these distinct formation pathways. Isotopic fractionation is a relatively common tool in astrochem., however until recently it has not been possible to measure fractionation at high angular resoln. The Atacama Large Millimeter/Submillimeter Array (ALMA) combines the sensitivity and angular resoln. required for these measurements, and represents a new method of approaching observational astrochem. We have obtained extremely high angular resoln. observations of Me cyanide (CH3CN) using the ALMA toward Orion KL. By simultaneously imaging 13CH3CN and CH2DCN we map the temp. structure and D/H ratio of CH3CN. We will present the results of these observations and discuss their implications for the formation of N-bearing orgs. in the interstellar medium.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Carroll, Brandon0000-0002-3191-5401
Blake, Geoffrey0000-0003-0787-1610
Additional Information:© 2018 American Chemical Society.
Group:Astronomy Department
Record Number:CaltechAUTHORS:20181108-161250799
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90775
Deposited By: Tony Diaz
Deposited On:13 Nov 2018 17:54
Last Modified:20 Apr 2020 08:47

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