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A search for HCCN in molecular clouds.

D McGonagle1, W M Irvine

  • 1Five College Radio Astronomy Observatory, Amherst, MA 01003, USA.

Astronomy and Astrophysics
|June 1, 1996
PubMed
Summary

Researchers searched for the molecule HCCN in dark clouds but did not detect it. This finding suggests carbon-chain growth may be inefficient in these cosmic environments.

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Area of Science:

  • Astrochemistry
  • Interstellar Medium Physics

Background:

  • Interstellar molecules provide insights into chemical processes in space.
  • Understanding the formation pathways of carbon-chain molecules is crucial for astrochemistry.

Purpose of the Study:

  • To search for the presence of HCCN in dark molecular clouds.
  • To constrain the abundance of HCCN and its implications for interstellar chemistry.

Main Methods:

  • Observations were made using the N(J) = 1(2)-->0(1) transition of HCCN.
  • Searches were conducted towards the dark cloud TMC-1 and several Giant Molecular Clouds (GMCs).

Main Results:

  • HCCN was not detected in any of the observed sources.
  • An upper limit on the HCCN column density in TMC-1 was determined to be less than or equal to 2 x 10^12 cm^-2.
  • The abundance ratio of HCN:HCCN:HCCCN in TMC-1 was found to be 1 : <0.01 : 0.3.

Conclusions:

  • The non-detection of HCCN suggests that carbon-chain growth via single carbon atom addition may be inefficient in dark clouds.
  • The derived abundance limits for HCCN constrain the branching ratios of dissociative electron recombination reactions, such as H3C2N+ + e-.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

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