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Title: DETECTABILITY OF GLYCINE IN SOLAR-TYPE SYSTEM PRECURSORS

Glycine (NH{sub 2}CH{sub 2}COOH) is the simplest amino acid relevant to life. Its detection in the interstellar medium is key to understanding the formation mechanisms of pre-biotic molecules and their subsequent delivery onto planetary systems. Glycine has been extensively searched for toward hot molecular cores, although these studies did not yield any firm detection. In contrast to hot cores, low-mass star forming regions, in particular their earliest stages represented by cold pre-stellar cores, may be better suited for the detection of glycine as well as more relevant to the study of pre-biotic chemistry in young solar system analogs. We present one-dimensional spherically symmetric radiative transfer calculations of the glycine emission expected to arise from the low-mass pre-stellar core L1544. Water vapor has recently been reported toward this core, indicating that a small fraction of the grain mantles in L1544 (∼0.5%) has been injected into the gas phase. Assuming that glycine is photo-desorbed together with water in L1544, and considering a solid abundance of glycine on ices of ∼10{sup –4} with respect to water, our calculations reveal that several glycine lines between 67 GHz and 80 GHz have peak intensities larger than 10 mK. These results show for the first time that glycine couldmore » reach detectable levels in cold objects such as L1544. This opens up the possibility of detecting glycine, and other pre-biotic species, at the coldest and earliest stages in the formation of solar-type systems with near-future instrumentation such as the Band 2 receivers of ALMA.« less
Authors:
;  [1] ;  [2] ;  [3]
  1. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching (Germany)
  2. School of Physics and Astronomy, University of Leeds, LS2 9JT Leeds (United Kingdom)
  3. Department of Physics and Astronomy, University College London, Gower Place, WC1E 6BT London (United Kingdom)
Publication Date:
OSTI Identifier:
22365815
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 787; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DETECTION; GHZ RANGE; GLYCINE; ICE; MASS; MOLECULES; ONE-DIMENSIONAL CALCULATIONS; PRECURSOR; RADIANT HEAT TRANSFER; SOLAR SYSTEM; SOLIDS; SPHERICAL CONFIGURATION; STARS; WATER; WATER VAPOR