Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...593..848k&link_type=abstract
The Astrophysical Journal, Volume 593, Issue 2, pp. 848-867.
Biology
95
Astrobiology, Ism: Abundances, Ism: Individual: Name: Orion Kleinmann-Low, Ism: Individual: Name: Sagittarius B2(N-Lmh), Ism: Individual: Alphanumeric: W51 E1/E2, Ism: Molecules, Line: Identification, Radio Lines: Ism
Scientific paper
We have searched for interstellar conformer I glycine (NH2CH2COOH), the simplest amino acid, in the hot molecular cores Sgr B2(N-LMH), Orion KL, and W51 e1/e2. An improved search strategy for intrinsically weak molecular lines, involving multisource observations, has been developed and implemented. In total, 82 spectral frequency bands, in the millimeter-wave region, were observed over a 4 yr period; 27 glycine lines were detected in 19 different spectral bands in one or more sources. The rotational temperatures derived from ``rotation diagrams'' are 75+29-16 K for Sgr B2(N-LMH), 141+76-37 K for Orion KL, and 121+71-32 K for W51 e1/e2. The total column densities inferred are 4.16+3.22-1.82×1014 cm-2 for Sgr B2, 4.37+1.79-1.27×1014 cm-2 for Orion, and 2.09+1.22-0.77×1014 cm-2 for W51. Production of interstellar glycine by both gas-phase ion-molecule reactions and by ultraviolet photolysis of molecular ices is briefly discussed. The discovery of interstellar glycine strengthens the thesis that interstellar organic molecules could have played a pivotal role in the prebiotic chemistry of the early Earth.
Charnley Steven B.
Huang Hui-Chun
Kisiel Zbigniew
Kuan Yi-Jehng
Tseng Wei-Ling
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