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A study of C3HD in cold interstellar clouds.

M B Bell1, L W Avery, H E Matthews

  • 1Herzberg Institute of Astrophysics, National Research Council of Canada.

The Astrophysical Journal
|March 15, 1988
PubMed
Summary
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This study detected the C3HD molecule in cold, dark clouds, revealing high deuteration ratios. These findings support ion-molecule chemistry as a key process in the formation of deuterated molecules.

Area of Science:

  • Astrochemistry
  • Radio Astronomy
  • Molecular Spectroscopy

Background:

  • Deuterated molecules are crucial tracers of early chemical conditions in interstellar clouds.
  • Understanding the formation pathways of complex deuterated molecules like C3HD is essential for astrochemistry.

Purpose of the Study:

  • To detect and characterize the C3HD molecule in cold, dark interstellar clouds.
  • To measure the abundance of C3HD relative to C3H2 and determine deuteration ratios.
  • To investigate the chemical mechanisms responsible for high deuteration levels.

Main Methods:

  • Radio astronomical observations of the 1(10)-1(01) transition of C3HD at 19.418 GHz.
  • High-resolution observations to resolve D hyperfine components in specific sources (L1498, TMC-1C).
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program ExobiologyNon-NASA Center

Related Experiment Videos

  • Simultaneous observations of C3H2 to derive relative abundances.

    • Main Results:

    • Detection of C3HD at twelve positions in cold, dark clouds.
    • Determination of D quadrupole coupling constants from resolved hyperfine components.
    • Measured relative [C3HD]/[C3H2] abundances ranging from 0.05 to 0.15, indicating high deuteration ratios.

    Conclusions:

    • The observed high deuteration ratios of C3HD are among the highest reported.
    • Ion-molecule chemistry, with an electron density [e-] of approximately 3 x 10(-7), can explain the derived abundance ratios.
    • This study provides valuable insights into the chemical processes governing deuterium fractionation in interstellar environments.