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Title:
Cyclopropenone (c-H2C3O): A New Interstellar Ring Molecule
Authors:
Hollis, J. M.; Remijan, Anthony J.; Jewell, P. R.; Lovas, F. J.
Affiliation:
AA(NASA Goddard Space Flight Center, Computational and Information Sciences and Technology Office, Code 606, Greenbelt, MD 20771.), AB(NASA Goddard Space Flight Center, Computational and Information Sciences and Technology Office, Code 606, Greenbelt, MD 20771.; National Research Council Resident Research Associate.), AC(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475.), AD(Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.)
Publication:
The Astrophysical Journal, Volume 642, Issue 2, pp. 933-939. (ApJ Homepage)
Publication Date:
05/2006
Origin:
UCP
ApJ Keywords:
ISM: Abundances, ISM: Clouds, ISM: Individual: Name: Sagittarius B2(N), ISM: Molecules, Radio Lines: ISM
DOI:
10.1086/501121
Bibliographic Code:
2006ApJ...642..933H

Abstract

The three-carbon keto ring cyclopropenone (c-H2C 3O) has been detected largely in absorption with the 100 m Green Bank Telescope (GBT) toward the star-forming region Sagittarius B2(N) by means of a number of rotational transitions between energy levels that have energies less than 10 K. Previous negative results from searches for interstellar c-H2C3O by other investigators attempting to detect rotational transitions that have energy levels ~10 K or greater indicate no significant hot core component. Thus, we conclude that only the low-energy levels of c-H2C3O are populated because the molecule state temperature is low, suggesting that c-H2C3O resides in a star-forming core halo region that has a widespread arcminute spatial scale. Toward Sagittarius B2(N), the GBT was also used to observe the previously reported, spatially ubiquitous, three-carbon ring cyclopropenylidene (c-C3H2 ), which has a divalent carbon that makes it highly reactive in the laboratory. The presence of both c-C3H2 and c-H2C3O toward Sagittarius B2(N) suggests that gas-phase oxygen addition may account for the synthesis of c-H 2C3O from c-C3H2. We also searched for but did not detect the three-carbon sugar glyceraldehyde (CH2OHCHOHCHO).
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