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Title:
Green Bank Telescope Detection of New Interstellar Aldehydes: Propenal and Propanal
Authors:
Hollis, J. M.; Jewell, P. R.; Lovas, F. J.; Remijan, A.; Møllendal, H.
Affiliation:
AA( ID="FN1"> 1NASA Goddard Space Flight Center, Space and Earth Data Computing Division, Code 930, Greenbelt, MD 20771.), AB( ID="FN2"> 2National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944-0002.), AC( ID="FN3"> 3Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.), AD( ID="FN1"> 1NASA Goddard Space Flight Center, Space and Earth Data Computing Division, Code 930, Greenbelt, MD 20771.; ID="FN4"> 4National Research Council Resident Research Associate.), AE( ID="FN5"> 5Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway.)
Publication:
The Astrophysical Journal, Volume 610, Issue 1, pp. L21-L24. (ApJL Homepage)
Publication Date:
07/2004
Origin:
UCP
ApJ Keywords:
ISM: Abundances, ISM: Clouds, ISM: Individual: Name: Sagittarius B2(N-LMH), ISM: Molecules, Radio Lines: ISM
DOI:
10.1086/423200
Bibliographic Code:
2004ApJ...610L..21H

Abstract

The new interstellar molecules propenal (CH2CHCHO) and propanal (CH3CH2CHO) have been detected largely in absorption toward the star-forming region Sagittarius B2(N) by means of rotational transitions observed with the 100 m Green Bank Telescope (GBT) operating in the range from 18 GHz (λ~1.7 cm) to 26 GHz (λ~1.2 cm). The GBT was also used to observe the previously reported interstellar aldehyde propynal (HC2CHO) in Sagittarius B2(N), which is a known source of large molecules presumably formed on interstellar grains. The presence of these three interstellar aldehydes toward Sagittarius B2(N) strongly suggests that simple hydrogen addition on interstellar grains accounts for successively larger molecular species: from propynal to propenal and from propenal to propanal. Energy sources within Sagittarius B2(N) likely permit the hydrogen addition reactions on grain surfaces to proceed. This work demonstrates that successive hydrogen addition is probably an important chemistry route in the formation of a number of complex interstellar molecules. We also searched for but did not detect the three-carbon sugar glyceraldehyde (CH2OHCHOHCHO).
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