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Title:
A Rigorous Attempt to Verify Interstellar Glycine
Authors:
Snyder, L. E.; Lovas, F. J.; Hollis, J. M.; Friedel, D. N.; Jewell, P. R.; Remijan, A.; Ilyushin, V. V.; Alekseev, E. A.; Dyubko, S. F.
Affiliation:
AA(Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801 ), AB(Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8441 ), AC(Earth and Space Data Computing Division, NASA Goddard Space Flight Center, Code 930, Greenbelt, MD 20771 ), AD(Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801 ), AE(National Radio Astronomy Observatory, Green Bank, WV 24944-0002 ), AF(Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801; Earth and Space Data Computing Division, NASA Goddard Space Flight Center, Code 930, Greenbelt, MD 20771; National Research Council Resident Research Associate. ), AG(Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Krasnoznamennaya 4, 61002 Kharkow, Ukraine ), AH(Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Krasnoznamennaya 4, 61002 Kharkow, Ukraine ), AI(Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Krasnoznamennaya 4, 61002 Kharkow, Ukraine )
Publication:
The Astrophysical Journal, Volume 619, Issue 2, pp. 914-930. (ApJ Homepage)
Publication Date:
02/2005
Origin:
UCP
Astronomy Keywords:
ISM: Abundances, ISM: Clouds, ISM: Individual: Name: Sagittarius B2(N-LMH), ISM: Individual: Name: Orion Kleinmann-Low, ISM: Individual: Alphanumeric: W51 e1/e2, ISM: Molecules, Radio Lines: ISM
DOI:
10.1086/426677
Bibliographic Code:
2005ApJ...619..914S

Abstract

In 2003, Kuan and coworkers reported the detection of interstellar glycine (NH2CH2COOH) based on observations of 27 lines in 19 different spectral bands in one or more of the sources Sgr B2(N-LMH), Orion KL, and W51 e1/e2. They supported their detection report with rotational temperature diagrams for all three sources. In this paper we present essential criteria that can be used in a straightforward analysis technique to confirm the identity of an interstellar asymmetric rotor such as glycine. We use new laboratory measurements of glycine as a basis for applying this analysis technique, both to our previously unpublished 12 m telescope data and to the previously published Swedish-ESO Submillimetre Telescope (SEST) data of Nummelin and colleagues. We conclude that key lines necessary for an interstellar glycine identification have not yet been found. We identify some common molecular candidates that should be examined further as more likely carriers of several of the lines reported as glycine. Finally, we illustrate that a rotational temperature diagram used without the support of correct spectroscopic assignments is not a reliable tool for the identification of interstellar molecules.
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